WO2002036504A2 - Method for cleaning blinded filter media and preventing filter blinding - Google Patents
Method for cleaning blinded filter media and preventing filter blinding Download PDFInfo
- Publication number
- WO2002036504A2 WO2002036504A2 PCT/US2001/030233 US0130233W WO0236504A2 WO 2002036504 A2 WO2002036504 A2 WO 2002036504A2 US 0130233 W US0130233 W US 0130233W WO 0236504 A2 WO0236504 A2 WO 0236504A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- fines
- unblinding
- agent
- water soluble
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 65
- 238000004140 cleaning Methods 0.000 title description 2
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002253 acid Substances 0.000 claims abstract description 21
- 150000003839 salts Chemical class 0.000 claims abstract description 19
- 239000007864 aqueous solution Substances 0.000 claims abstract description 17
- 239000012141 concentrate Substances 0.000 claims abstract description 15
- 150000001991 dicarboxylic acids Chemical class 0.000 claims abstract description 12
- 150000007513 acids Chemical class 0.000 claims abstract description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 56
- 229910052742 iron Inorganic materials 0.000 claims description 28
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Natural products OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 25
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 14
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 14
- -1 methylene phosphonic acid Chemical compound 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 12
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 claims description 11
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims description 10
- CIWBSHSKHKDKBQ-DUZGATOHSA-N D-isoascorbic acid Chemical compound OC[C@@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-DUZGATOHSA-N 0.000 claims description 9
- 229910052783 alkali metal Inorganic materials 0.000 claims description 9
- 235000010350 erythorbic acid Nutrition 0.000 claims description 9
- 229940026239 isoascorbic acid Drugs 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims description 9
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims description 8
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical class NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims description 8
- 235000010323 ascorbic acid Nutrition 0.000 claims description 8
- 239000011668 ascorbic acid Chemical class 0.000 claims description 8
- 229960005070 ascorbic acid Drugs 0.000 claims description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 7
- 235000010265 sodium sulphite Nutrition 0.000 claims description 7
- UTCHNZLBVKHYKC-UHFFFAOYSA-N 2-hydroxy-2-phosphonoacetic acid Chemical compound OC(=O)C(O)P(O)(O)=O UTCHNZLBVKHYKC-UHFFFAOYSA-N 0.000 claims description 6
- GLULCKCBVYGUDD-UHFFFAOYSA-N 2-phosphonobutane-1,1,1-tricarboxylic acid Chemical compound CCC(P(O)(O)=O)C(C(O)=O)(C(O)=O)C(O)=O GLULCKCBVYGUDD-UHFFFAOYSA-N 0.000 claims description 6
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 6
- XDGAWOIMXRDTRA-UHFFFAOYSA-N [6-(diphosphonoamino)hexyl-phosphonoamino]phosphonic acid Chemical compound OP(O)(=O)N(P(O)(O)=O)CCCCCCN(P(O)(O)=O)P(O)(O)=O XDGAWOIMXRDTRA-UHFFFAOYSA-N 0.000 claims description 6
- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 claims description 6
- ARHQUDZVGASAQZ-UHFFFAOYSA-N triaminomethylphosphonic acid Chemical compound NC(N)(N)P(O)(O)=O ARHQUDZVGASAQZ-UHFFFAOYSA-N 0.000 claims description 6
- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 claims description 5
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 5
- 239000001361 adipic acid Substances 0.000 claims description 5
- 235000011037 adipic acid Nutrition 0.000 claims description 5
- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 claims description 5
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims description 5
- 239000011976 maleic acid Substances 0.000 claims description 5
- 229920001174 Diethylhydroxylamine Chemical class 0.000 claims description 4
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Chemical class OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 4
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical class OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 4
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 4
- FVCOIAYSJZGECG-UHFFFAOYSA-N diethylhydroxylamine Chemical class CCN(O)CC FVCOIAYSJZGECG-UHFFFAOYSA-N 0.000 claims description 4
- 239000001530 fumaric acid Substances 0.000 claims description 4
- 239000008103 glucose Chemical class 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- PAPFRBPAHQBQEZ-UHFFFAOYSA-N (3-amino-1-phosphonopropyl)phosphonic acid Chemical compound NCCC(P(O)(O)=O)P(O)(O)=O PAPFRBPAHQBQEZ-UHFFFAOYSA-N 0.000 claims description 3
- MJPWXCPGHYETKV-UHFFFAOYSA-N (3-hydroxy-1-phosphonopropyl)phosphonic acid Chemical compound OCCC(P(O)(O)=O)P(O)(O)=O MJPWXCPGHYETKV-UHFFFAOYSA-N 0.000 claims description 3
- XSZARSUFVSYQJT-UHFFFAOYSA-N (4-hydroxy-1-phosphonobutyl)phosphonic acid Chemical compound OCCCC(P(O)(O)=O)P(O)(O)=O XSZARSUFVSYQJT-UHFFFAOYSA-N 0.000 claims description 3
- GSIRUKNWWJINHL-UHFFFAOYSA-N (6-hydroxy-1-phosphonohexyl)phosphonic acid Chemical compound OCCCCCC(P(O)(O)=O)P(O)(O)=O GSIRUKNWWJINHL-UHFFFAOYSA-N 0.000 claims description 3
- VILCJCGEZXAXTO-UHFFFAOYSA-N 2,2,2-tetramine Chemical compound NCCNCCNCCN VILCJCGEZXAXTO-UHFFFAOYSA-N 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- YDONNITUKPKTIG-UHFFFAOYSA-N [Nitrilotris(methylene)]trisphosphonic acid Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CP(O)(O)=O YDONNITUKPKTIG-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- DUYCTCQXNHFCSJ-UHFFFAOYSA-N dtpmp Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CCN(CP(O)(=O)O)CCN(CP(O)(O)=O)CP(O)(O)=O DUYCTCQXNHFCSJ-UHFFFAOYSA-N 0.000 claims description 3
- NFDRPXJGHKJRLJ-UHFFFAOYSA-N edtmp Chemical compound OP(O)(=O)CN(CP(O)(O)=O)CCN(CP(O)(O)=O)CP(O)(O)=O NFDRPXJGHKJRLJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004744 fabric Substances 0.000 description 30
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 7
- 239000011575 calcium Substances 0.000 description 7
- 229910052791 calcium Inorganic materials 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 5
- 239000003112 inhibitor Substances 0.000 description 5
- 239000012964 benzotriazole Substances 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 3
- 230000001186 cumulative effect Effects 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- YRKCREAYFQTBPV-UHFFFAOYSA-N acetylacetone Chemical compound CC(=O)CC(C)=O YRKCREAYFQTBPV-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- UEZVMMHDMIWARA-UHFFFAOYSA-M phosphonate Chemical compound [O-]P(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-M 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 229920006318 anionic polymer Polymers 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 125000003354 benzotriazolyl group Chemical group N1N=NC2=C1C=CC=C2* 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- GBHRVZIGDIUCJB-UHFFFAOYSA-N hydrogenphosphite Chemical class OP([O-])[O-] GBHRVZIGDIUCJB-UHFFFAOYSA-N 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- UIIIBRHUICCMAI-UHFFFAOYSA-N prop-2-ene-1-sulfonic acid Chemical compound OS(=O)(=O)CC=C UIIIBRHUICCMAI-UHFFFAOYSA-N 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- 239000011684 sodium molybdate Substances 0.000 description 1
- 235000015393 sodium molybdate Nutrition 0.000 description 1
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 230000003381 solubilizing effect Effects 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/79—Regeneration of the filtering material or filter elements inside the filter by liquid process
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
- C02F5/145—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus combined with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- This invention relates to methods for unblinding filters in iron ore and mineral concentrating operations, and to methods for preventing filter blinding.
- Blinding of disk filters is a major operating problem at iron ore and other mineral concentrate plants. These filters generally treat the final ore concentrate to produce a 9-10% moisture filter cake for balling and pelletizing. Typically, the concentrate has a particle size where about 90% will pass through a 500 mesh screen. Blinding of the filter cloths is believed to be due to both ore fines, particularly iron ore fines, calcium carbonate, which is added in some operations to produce self-fluxing pellets, and to chemical precipitation reactions.
- Filter blinding seriously reduces the rate of filtration through the filters.
- an average filter bag had about 21 days operation before the filter blinding reduced performance to the point where it was necessary to change the bag.
- Blinding of the filters occurs not only from deposits of concentrate material on the surface of the filter, but also from penetration of the fines into the pores of the filter cloth. Consequently removal of material from the surface of the filters is not sufficient to restore performance.
- Methods for unblinding the filters must also effect removal of the fines from the filter pores.
- Prior to this invention there have been no commercially acceptable ways of accomplishing removal of the fines from the filter pores.
- 4,432,879 discloses methods for dispersing sludge in cooling water systems by means of a combination of 2-phosphonobutane 1,2,4- tricarboxylic acid and a water soluble organic polymer possessing carboxylic and sulfonate groups.
- U.S. Patent No. 4,600,524 discloses a method for inhibiting scale in an aqueous system by addition of a copolymer of maleic acid or anhydride or fumaric acid and allyl sulfonic acid and a water soluble organic phosphonic acid.
- U.S. Patent No. 4,581,145 discloses a method for inhibiting scale in an aqueous system by addition of a composition comprising a copolymer of maleic acid or anhydride and vinyl sulfonic acid and an organic phosphonate.
- this invention relates to a method for reducing the blinding of mineral processing filters that are blinded with fines comprising metallic ore fines, the method comprising treating the blinded filters with an aqueous solution comprising an unblinding agent for a time sufficient to solubilize at least a portion of the fines.
- the invention in another embodiment relates to a method for preventing blinding of filters by fines comprising metallic ore fines in processes for filtering aqueous metallic ore concentrates, the method comprising adding to the aqueous metallic ore concentrate an effective amount of an unblinding agent which solubilizes at least a portion of the fines.
- the invention is a method for reducing the blinding of filters used in mineral processing that are fouled with metallic ore fines by treating the blinded filters with a solution of an unblinding agent which will solubilize the ore fines.
- the invention is particularly suited for use in the processing of iron ore and copper ore. Most preferably it is used in the processing of iron ore where the ore concentrate discharging from flotation is dewatered and then filtered.
- the filters are typically disk filters equipped with filter cloths.
- the unblinding agent of the invention comprises an aqueous solution of a solubilizing agent for the metallic ore, preferably iron ore.
- a solubilizing agent for the metallic ore preferably iron ore.
- Any water soluble material which will solubilize the ore is operable in the invention.
- Particularly preferred solubilizing agents are organophosphonic acids, or water soluble salts thereof, and C 4 -C 7 dicarboxylic acids.
- the most preferred water soluble salts of the organophosphonic acids are alkali metal salts.
- the preferred solubilizing agents are organophosphonic acids, or water soluble salts thereof.
- organophosphonic acids which are operable in the invention are hydroxyethylidene diphosphonic acid, triaminomethyl phosphonic acid , aminotri(methylene phosphonic acid), hexamethylenediaminetetra phosphonic acid, 2-phosphonobutane tricarboxylic acid- 1,2, 4, ethylenediamine tetra(methylene phosphonic acid), diethylenetriamine penta(methylene phosphonic acid), triethylenetetraamine hexa(methylene phosphonic acid), aminopropylidene diphosphonic acid, hydroxypropylidene diphosphonic acid, hydroxybutylidene diphosphonic acid, hydroxyhexylidene diphosphonic acid and phosphonohydroxy acetic acid.
- Preferred organophosphonates are hexamethylenediaminetetra phosphonic acid, 2-phosphonobutane tricarboxylic acid- 1,2,4, phosphonohydroxy acetic acid, triaminomethyl phosphonic acid and hydroxyethylidene diphosphonic acid.
- the most preferred organophosphonate is hydroxyethylidene diphosphonic acid.
- a reducing agent to maintain the iron in a soluble form even in the presence of oxygen.
- Typical reducing agent are sodium sulfite, isoascorbic acid, alkali metal salts of isoascorbic acid, ascorbic acid, alkali metal salts of ascorbic acid, diethylhydroxylamine, glucose and hydrazine.
- a preferred reducing agent is sodium sulfite.
- the aqueous solutions containing the unblinding agents of the invention will contain from about 5 to about 25 wt.% of the solubilizing agent.
- aqueous solutions may contain other optional ingredients such as surfactants, dispersants and corrosion inhibitors. The latter are particularly useful when the unblinding agent will be in contact with metallic equipment parts during its use.
- useful corrosion inhibitors are: acetyl acetone, sodium meta silicate, sodium molybdate, benzotriazole, ethoxylated tallow amine, and sodium hexametaphosphate.
- a preferred corrosion inhibitor is benzotriazole.
- Corrosion inhibitors if present, will generally be used at levels of from 0.005 to 0.5 wt.% based on the total weight of the aqueous solution. The preferred level is from about 0.01 to 1 wt.%.
- a variety of surfactants and dispersants well known in the art may be used in the compositions. With respect dispersants, anionic polymers have been found particularly useful.
- organophosphonate containing unblinding agents of the present invention may be used at essentially neutral or even basic pH's. This is a substantial advantage of the present systems because the neutral or higher pH's not only minimize corrosion of metallic equipment, but also prevent degradation of the filter cloths, many of which are quite sensitive to acids.
- the pH of the aqueous solution of unblinding agent will be adjusted to from about 6.5 to about 7.5, and more preferably from about 6.1 to about 7.2.
- the solubilizing agent may also comprise C -C 7 dicarboxylic acids.
- dicarboxylic acids are particularly useful unblinding agents when the fines contain substantial quantities of metal carbonates, particularly calcium carbonate, because they are very effective in solubilizing the carbonates.
- Preferred dicarboxylic acids for use are water soluble dicarboxylic acids examples of which are fumaric acid, maleic acid, succinic acid, glutaric acid, adipic acid and pimelic acid.
- unblinding of filters using the processes of the invention will be carried out by mechanically removing the fines and other blinding materials from the surface of the filter followed by removal of the fines in the pores of the filter by treatment of the filter with the unblinding agents of the invention.
- the length of time for contact of the filter with unblinding agent, and the amount of unblinding agent utilized will depend on a variety of factors specific to the system being operated. These factors include: the identity of the metallic ore, the amount of non-metallic ore fines present, the thickness and pore size of the filters being utilized.
- the temperature of the unblinding step is preferably from about room temperature to about 100°C, with unblinding occurring more rapidly at the higher temperatures.
- the preferred way of carrying out the invention is to treat the blinded filter with the unblinding agent for a time sufficient to dissolve the fines that are blinding the filter.
- Another method of utilizing the invention is to prevent blinding by adding the unblinding agent to the metallic ore concentrate, i.e. an in situ method. In this method the filter is effectively being cleaned by continuous treatment with the unblinding agent as filtration proceeds.
- Cloth A would contain 31% calcium carbonate and Cloth B 25% calcium carbonate.
- Treatment of the cloths with dilute hydrochloric acid resulted in carbon dioxide evolution, thus indicating the presence of carbonate.
- Example 1 This example was carried out using Cloth B.
- a sample of blinded Cloth B was treated by the first procedure above using a 10% solution of Ferroquest ® 7101 rust removal agent, available from BetzDearbom, Trevose, Pa.
- Ferroquest ® 7101 is a 1.7 wt.% aqueous solution of hydroxyethylidene diphosphonic acid, also containing 1 wt.% isoascorbic acid.
- Other components contained in Ferroquest ® 7101 are small amounts of benzotriazole, polyacrylic acid and amphoteric surfactant.
- the pH was 6.5.
- the "Dip and Suck Test” was carried out on the blinded filter cloth before treatment, the filter cloth after treatment, and on unused "clean" filter cloth.
- the blinded filter cloth before treatment gave a mean filtration rate result (average of 6 trials) of 5.82 ml/minute and a median result of 5.78 ml/minute.
- the blinded filter cloth after treatment gave a mean filtration rate result (average of 6 trials) of 6.69 ml/minute and a median result of 6.67 ml/minute.
- the clean filter cloth gave a mean filtration rate result (average of 6 trials) of 6.97 ml/minute and a median result of 6.80 ml/minute.
- the blinded filter cloth before treatment gave a mean filtration rate result (average of 6 trials) of 4.85 ml/minute and a median result of 4.87 ml/minute
- the blinded filter cloth after treatment gave a mean filtration rate result (average of 6 trials) of 5.73 ml/minute and a median result of 5.61 ml/minute.
- the clean filter cloth gave a mean filtration rate result (average of 6 trials) of 5.85 ml/minute and a median result of 5.82 ml/minute.
- the permeability of the blinded filter cloth improved substantially after treatment, almost to the performance level of a new, unused cloth.
- Example 3 Cloth A and Cloth B were treated by the second procedure described above using Ferroquest ® 7101 as the unblinding solution.
- the cumulative % calcium leached from the filter cloths at various treatment times is in the table below.
- Example 4 Cloth B was treated by the second procedure described above using an aqueous solution (pH 4.5-5.5) of 4 wt.% adipic acid, 13 wt.% glutaric acid, 6 wt.%) succinic acid and 1 wt.%> nitric acid.
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Abstract
Reducing the blinding of mineral processing filters blinded with metallic ore fines by treating the blinded filters with an aqueous solution of an unblinding agent which solubilizes at least a portion of the ore fines. Preventing blinding of the filters by metallic ore fines, by adding to the aqueous metallic ore concentrate an effective amount of an unblinding agent which solubilizes at least a portion of the metallic ore fines. Preferred unblinding agents are selected from the group consisting of water soluble organophosphonic acids, or water soluble salts thereof, and C4-C7 dicarboxylic acids.
Description
METHOD FOR CLEANING BLINDED FILTER MEDIA AND PREVENTING FILTER BLINDING
FIELD OF THE INVENTION This invention relates to methods for unblinding filters in iron ore and mineral concentrating operations, and to methods for preventing filter blinding.
BACKGROUND OF THE INVENTION
Blinding of disk filters is a major operating problem at iron ore and other mineral concentrate plants. These filters generally treat the final ore concentrate to produce a 9-10% moisture filter cake for balling and pelletizing. Typically, the concentrate has a particle size where about 90% will pass through a 500 mesh screen. Blinding of the filter cloths is believed to be due to both ore fines, particularly iron ore fines, calcium carbonate, which is added in some operations to produce self-fluxing pellets, and to chemical precipitation reactions.
Filter blinding seriously reduces the rate of filtration through the filters. As an example of the problem, it was found that at a typical iron ore concentrate plant, an average filter bag had about 21 days operation before the filter blinding reduced performance to the point where it was necessary to change the bag. Blinding of the filters occurs not only from deposits of concentrate material on the surface of the filter, but also from penetration of the fines into the pores of the filter cloth. Consequently removal of material from the surface of the filters is not sufficient to restore performance. Methods for unblinding the filters must also effect removal of the fines from the filter pores. Prior to this invention there have been no commercially acceptable ways of accomplishing removal of the fines from the filter pores.
U.S. Patent No. 4,432,879 discloses methods for dispersing sludge in cooling water systems by means of a combination of 2-phosphonobutane 1,2,4- tricarboxylic acid and a water soluble organic polymer possessing carboxylic and sulfonate groups. U.S. Patent No. 4,600,524 discloses a method for inhibiting scale in an aqueous system by addition of a copolymer of maleic acid or anhydride or fumaric acid and allyl sulfonic acid and a water soluble organic phosphonic acid.
U.S. Patent No. 4,581,145 discloses a method for inhibiting scale in an aqueous system by addition of a composition comprising a copolymer of maleic acid or anhydride and vinyl sulfonic acid and an organic phosphonate.
In U.S. Patent No. 4,810,405, there is disclosed a method for removing iron oxide deposits from the surface of metals by use of an aqueous solution at approximately neutral pH containing a phosphonate (e.g. hydroxyethylidene diphosphonic acid), a reducing agent (e.g. sodium sulfite) and a corrosion inhibitor (e.g. benzotriazole).
SUMMARY OF THE INVENTION
In its first embodiment this invention relates to a method for reducing the blinding of mineral processing filters that are blinded with fines comprising metallic ore fines, the method comprising treating the blinded filters with an aqueous solution comprising an unblinding agent for a time sufficient to solubilize at least a portion of the fines.
In another embodiment the invention relates to a method for preventing blinding of filters by fines comprising metallic ore fines in processes for filtering aqueous metallic ore concentrates, the method comprising adding to the aqueous metallic ore concentrate an effective amount of an unblinding agent which solubilizes at least a portion of the fines.
DETAILED DESCRIPTION OF THE INVENTION
In its first embodiment the invention is a method for reducing the blinding of filters used in mineral processing that are fouled with metallic ore fines by treating the blinded filters with a solution of an unblinding agent which will solubilize the ore fines. The invention is particularly suited for use in the processing of iron ore and copper ore. Most preferably it is used in the processing of iron ore where the ore concentrate discharging from flotation is dewatered and then filtered. The filters are typically disk filters equipped with filter cloths.
The unblinding agent of the invention comprises an aqueous solution of a solubilizing agent for the metallic ore, preferably iron ore. Any water soluble material which will solubilize the ore is operable in the invention. Particularly preferred solubilizing agents are organophosphonic acids, or water soluble salts thereof, and C4-C7 dicarboxylic acids. The most preferred water soluble salts of the organophosphonic acids are alkali metal salts. The preferred solubilizing agents are organophosphonic acids, or water soluble salts thereof.
Examples of organophosphonic acids which are operable in the invention are hydroxyethylidene diphosphonic acid, triaminomethyl phosphonic acid , aminotri(methylene phosphonic acid), hexamethylenediaminetetra phosphonic acid, 2-phosphonobutane tricarboxylic acid- 1,2, 4, ethylenediamine tetra(methylene phosphonic acid), diethylenetriamine penta(methylene phosphonic acid), triethylenetetraamine hexa(methylene phosphonic acid), aminopropylidene diphosphonic acid, hydroxypropylidene diphosphonic acid, hydroxybutylidene diphosphonic acid, hydroxyhexylidene diphosphonic acid and phosphonohydroxy acetic acid.
Preferred organophosphonates are hexamethylenediaminetetra phosphonic acid, 2-phosphonobutane tricarboxylic acid- 1,2,4, phosphonohydroxy acetic acid, triaminomethyl phosphonic acid and
hydroxyethylidene diphosphonic acid. The most preferred organophosphonate is hydroxyethylidene diphosphonic acid.
Particularly in the case of iron ore processing, it can be useful to minimize reformation of the blinding iron oxides on the filter cloth by including in the unblinding agent a reducing agent to maintain the iron in a soluble form even in the presence of oxygen. Typical reducing agent are sodium sulfite, isoascorbic acid, alkali metal salts of isoascorbic acid, ascorbic acid, alkali metal salts of ascorbic acid, diethylhydroxylamine, glucose and hydrazine. A preferred reducing agent is sodium sulfite. Preferably the aqueous solutions containing the unblinding agents of the invention will contain from about 5 to about 25 wt.% of the solubilizing agent. More preferably they will contain from about 10 to about 20 wt. % solubilizing agent. When the optional reducing agent is utilized, it will preferably be present at level of from about 1 to about 5 wt.%. The aqueous solutions may contain other optional ingredients such as surfactants, dispersants and corrosion inhibitors. The latter are particularly useful when the unblinding agent will be in contact with metallic equipment parts during its use. Examples of useful corrosion inhibitors are: acetyl acetone, sodium meta silicate, sodium molybdate, benzotriazole, ethoxylated tallow amine, and sodium hexametaphosphate. A preferred corrosion inhibitor is benzotriazole. Corrosion inhibitors, if present, will generally be used at levels of from 0.005 to 0.5 wt.% based on the total weight of the aqueous solution. The preferred level is from about 0.01 to 1 wt.%. A variety of surfactants and dispersants well known in the art may be used in the compositions. With respect dispersants, anionic polymers have been found particularly useful.
An advantage of the organophosphonate containing unblinding agents of the present invention is that they may be used at essentially neutral or even basic pH's. This is a substantial advantage of the present systems because the neutral or higher pH's not only minimize corrosion of metallic equipment, but also
prevent degradation of the filter cloths, many of which are quite sensitive to acids. Preferably the pH of the aqueous solution of unblinding agent will be adjusted to from about 6.5 to about 7.5, and more preferably from about 6.1 to about 7.2. As indicated above, the solubilizing agent may also comprise C -C7 dicarboxylic acids. These dicarboxylic acids are particularly useful unblinding agents when the fines contain substantial quantities of metal carbonates, particularly calcium carbonate, because they are very effective in solubilizing the carbonates. Preferred dicarboxylic acids for use are water soluble dicarboxylic acids examples of which are fumaric acid, maleic acid, succinic acid, glutaric acid, adipic acid and pimelic acid.
Preferably unblinding of filters using the processes of the invention will be carried out by mechanically removing the fines and other blinding materials from the surface of the filter followed by removal of the fines in the pores of the filter by treatment of the filter with the unblinding agents of the invention. The length of time for contact of the filter with unblinding agent, and the amount of unblinding agent utilized will depend on a variety of factors specific to the system being operated. These factors include: the identity of the metallic ore, the amount of non-metallic ore fines present, the thickness and pore size of the filters being utilized. The temperature of the unblinding step is preferably from about room temperature to about 100°C, with unblinding occurring more rapidly at the higher temperatures. It is well within the ability of those skilled in the art to choose the conditions of temperature, amount of unblinding agent and treatment time effective for the particular system being examined. As indicated above, the preferred way of carrying out the invention is to treat the blinded filter with the unblinding agent for a time sufficient to dissolve the fines that are blinding the filter. Another method of utilizing the invention is to prevent blinding by adding the unblinding agent to the metallic ore
concentrate, i.e. an in situ method. In this method the filter is effectively being cleaned by continuous treatment with the unblinding agent as filtration proceeds.
The invention is illustrated by the following examples, which are exemplary only and not intended to be limiting. All percentages, parts, etc. are by weight unless otherwise indicated. Procedures
Two iron ore blinded filter cloths (Cloth A and Cloth B) were obtained from representative iron ore concentrate plants, and analyzed using Energy Dispersive X-Ray Analysis (EDXA). The results obtained were as follows:
If the calcium were present as calcium carbonate, Cloth A would contain 31% calcium carbonate and Cloth B 25% calcium carbonate. Treatment of the cloths with dilute hydrochloric acid resulted in carbon dioxide evolution, thus indicating the presence of carbonate.
Laboratory unblinding studies were carried out in two ways. In the first procedure, 15.2 cm square swatches of blinded filter cloth were clamped onto the filter leaf of a conventional 92.9 cm EIMCO type filtering apparatus. It was then immersed in a solution of unblinding agent, heated to 49°C with stirring for 24 hours. Laboratory "Dip and Suck" tests were carried out on the damp swatches wrapped onto a conventional 92.9 cm2 EIMCO type filtering apparatus. The hose was pinched tightly to create vacuum, and then the filter leaf was immersed in an iron ore slurry concentrate for 20 seconds to form a cake on the filter. The filter was then removed and inverted to drain the residual water from
the hose, for up to an additional 1.5 minutes, under vacuum The amount of solution filtered per unit of time was used as a measure of filter permeability.
In the second procedure, 5J cm square swatches of iron ore blinded filter media were immersed in 600 ml beakers containing an unblinding solution. The solutions were slowly stirred and the temperature was maintained at 49°C. Aliquots of solution were removed periodically and analyzed for calcium as a function of time, thus providing a measure of the amount of calcium salt removed from the filter pores. At the conclusion of the leaching test, the filter cloths were rinsed with distilled water, dried and then analyzed for iron by EDXA.
Example 1 This example was carried out using Cloth B. A sample of blinded Cloth B was treated by the first procedure above using a 10% solution of Ferroquest®7101 rust removal agent, available from BetzDearbom, Trevose, Pa. Ferroquest®7101 is a 1.7 wt.% aqueous solution of hydroxyethylidene diphosphonic acid, also containing 1 wt.% isoascorbic acid. Other components contained in Ferroquest®7101 are small amounts of benzotriazole, polyacrylic acid and amphoteric surfactant. The pH was 6.5. The "Dip and Suck Test" was carried out on the blinded filter cloth before treatment, the filter cloth after treatment, and on unused "clean" filter cloth.
The blinded filter cloth before treatment gave a mean filtration rate result (average of 6 trials) of 5.82 ml/minute and a median result of 5.78 ml/minute. The blinded filter cloth after treatment gave a mean filtration rate result (average of 6 trials) of 6.69 ml/minute and a median result of 6.67 ml/minute. The clean filter cloth gave a mean filtration rate result (average of 6 trials) of 6.97 ml/minute and a median result of 6.80 ml/minute.
Thus the permeability of the blinded filter cloth improved substantially after treatment, almost to the performance level of a new, unused cloth.
Example 2
The procedure of Example 1 was repeated using Cloth A.
The blinded filter cloth before treatment gave a mean filtration rate result (average of 6 trials) of 4.85 ml/minute and a median result of 4.87 ml/minute
The blinded filter cloth after treatment gave a mean filtration rate result (average of 6 trials) of 5.73 ml/minute and a median result of 5.61 ml/minute.
The clean filter cloth gave a mean filtration rate result (average of 6 trials) of 5.85 ml/minute and a median result of 5.82 ml/minute.
Thus the permeability of the blinded filter cloth improved substantially after treatment, almost to the performance level of a new, unused cloth.
Example 3 Cloth A and Cloth B were treated by the second procedure described above using Ferroquest®7101 as the unblinding solution. The cumulative % calcium leached from the filter cloths at various treatment times is in the table below.
At the end of the test the filter cloths were analyzed for iron by EDXA. For Cloth A the iron level was reduced from 50%> to 26%, and for Cloth B from 50% to 8%.
These results demonstrate substantial removal of both iron and calcium from the blinded filters.
Example 4 Cloth B was treated by the second procedure described above using an aqueous solution (pH 4.5-5.5) of 4 wt.% adipic acid, 13 wt.% glutaric acid, 6 wt.%) succinic acid and 1 wt.%> nitric acid.
The cumulative % calcium leached from the filter cloth at various treatment times is in the table below.
Cumulative % Calcium Leached from Filter Cloths
At the end of the test the filter cloth was analyzed for iron by EDXA. The iron level was reduced from 50%> to 45%. These results demonstrate substantial removal of calcium from the blinded filter, and moderate removal of iron. It is not intended that the examples presented here should be construed to limit the invention, but rather they are presented to illustrate some specific embodiments of the invention. Various modifications and variations of the present invention can be made without departing from the scope of the appended claims.
Claims
1. A method for reducing the blinding of mineral processing filters that are blinded with fines comprising metallic ore fines, the method comprising treating the blinded filters with an aqueous solution comprising an unblinding agent for a time sufficient to solubilize at least a portion of the fines.
2. The method of claim 1 wherein the metallic ore is iron ore.
3. The method of claim 1 wherein the metallic ore is copper ore.
4. The method of claim 1 wherein the unblinding agent is selected from the group consisting of water soluble organophosphonic acids, or water soluble salts thereof, and C4-C7 dicarboxylic acids.
5. The method of claim 1 wherein the unblinding agent is an organophosphonic acid or salt thereof selected from the group consisting of hydroxyethylidene diphosphonic acid, triaminomethyl phosphonic acid , aminotri(methylene phosphonic acid), hexamethylenediaminetetra phosphonic acid, 2-phosphonobutane tricarboxylic acid- 1,2,4, ethylenediamine tetra(methylene phosphonic acid), diethylenetriamine penta(methylene phosphonic acid), triethylenetetraamine hexa(methylene phosphonic acid), aminopropylidene diphosphonic acid, hydroxypropylidene diphosphonic acid, hydroxybutylidene diphosphonic acid, hydroxyhexylidene diphosphonic acid and phosphonohydroxy acetic acid.
6. The method of claim 1 wherein the unblinding agent is hydroxyethylidene diphosphonic acid or a water soluble salt thereof.
7. The method of claim 1 wherein the aqueous solution further comprises a reducing agent.
8. The method of claim 7 wherein the unblinding agent comprises an organophosphonic acid or salt thereof and the reducing agent is selected from the group consisting of sodium sulfite, isoascorbic acid, alkali metal salts of isoascorbic acid, ascorbic acid, alkali metal salts of ascorbic acid, diethylhydroxylamine, glucose and hydrazine.
9. The method of claim 7 wherein the unblinding agent is an organophosphonic acid or water soluble salt thereof selected from the group consisting of hydroxyethylidene diphosphonic acid, triaminomethyl phosphonic acid, hexamethylenediaminetetra phosphonic acid, 2-phosphonobutane tricarboxylic acid- 1,2,4 and phosphonohydroxy acetic acid, and the reducing agent is selected from the group consisting of sodium sulfite, isoascorbic acid, alkali metal salts of isoascorbic acid, ascorbic acid, alkali metal salts of ascorbic acid, diethylhydroxylamine, glucose and hydrazine.
10. The method of claim 8 wherein the organophosphonic acid is hydroxyethylidene diphosphonic acid and the reducing agent is sodium sulfite.
11. The method of claim 1 wherein the pH of the aqueous solution is from about 6.5 to about 7.5.
12. The method of claim 1 wherein the pH of the aqueous solution is from about 6.7 to about 7.2.
13. The method of claim 1 wherein the fines further comprise mineral salts.
14. The method of claim 1 wherein the fines further comprise calcium carbonate.
15. The method of claim 1 wherein the fines comprise iron ore fines, and the unblinding agent comprises an organophosphonic acid or water soluble salt thereof.
16. The method of claim 7 wherein the fines comprise iron ore fines and the solution comprises an organophosphonic acid or water soluble salt thereof.
17. The method of claim 1 wherein the unblinding agent comprises C4- C7 dicarboxylic acids.
18. The method of claim 1 wherein the unblinding agent comprises C4- C7 acids selected from the group consisting of fumaric acid, maleic acid, succinic acid, glutaric acid, adipic acid and pimelic acid.
19. The method of claim 1 wherein the metallic ore fines are iron ore fines and the unblinding agent is C4-C7 dicarboxylic acids.
20. The method of claim 1 wherein the unblinding agent comprises C4- C7 acids selected from the group consisting of succinic acid, glutaric acid, and adipic acid.
21. The method of claim 1 wherein the metallic ore fines are iron ore fines, the unblinding agent comprises water soluble organophosphonic acid, or a water soluble salt thereof, and the pH of the aqueous solution is from about 6.5 to about 7.5
22. A method for preventing blinding of filters by fines comprising metallic ore fines in processes for filtering aqueous metallic ore concentrates, the method comprising adding to the aqueous metallic ore concentrate an effective amount of an unblinding agent which solubilizes at least a portion of the fines.
23. The process of claim 22 wherein the metallic ore fines are selected from the group consisting of iron ore fines and copper ore fines.
24. The method of claim 22 wherein the unblinding agent is selected from the group consisting of water soluble organophosphonic acids, or water soluble salts thereof, and C4-C7 dicarboxylic acids.
25. The method of claim 22 wherein the method further comprises adding to the aqueous metallic ore concentrate a reducing agent.
26. The method of claim 22 wherein the unblinding agent is an organophosphonic acid or water soluble salt thereof selected from the group consisting of hydroxyethylidene diphosphonic acid, triaminomethyl phosphonic acid, aminotri(methylene phosphonic acid), hexamethylenediaminetetra phosphonic acid, 2-phosphonobutane tricarboxylic acid- 1,2,4, ethylenediamine tetra(methylene phosphonic acid), diethylenetriamine penta(methylene phosphonic acid), triethylenetetraamine hexa(methylene phosphonic acid), aminopropylidene diphosphonic acid, hydroxypropylidene diphosphonic acid, hydroxybutylidene diphosphonic acid, hydroxyhexylidene diphosphonic acid and phosphonohydroxy acetic acid.
27. The method of claim 22 wherein the unblinding agent comprises a water soluble organophosphonic acid or water soluble salt thereof selected from the group consisting of hydroxyethylidene diphosphonic acid, triaminomethyl phosphonic acid, hexamethylenediaminetetra phosphonic acid, 2-phosphonobutane tricarboxylic acid- 1,2,4 and phosphonohydroxy acetic acid.
28. The method of claim 25 wherein the reducing agent is selected from the group consisting of sodium sulfite, isoascorbic acid, alkali metal salts of isoascorbic acid, ascorbic acid, alkali metal salts of ascorbic acid, diethylhydroxylamine, glucose and hydrazine.
29. The method of claim 22 wherein the fines further comprise mineral salt fines.
30. The method of claim 22 wherein the fines further comprise calcium carbonate fines.
31. The method of claim 22 wherein the fines comprise iron ore fines, and the unblinding agent comprises an aqueous solution of an organophosphonic acid or water soluble salt thereof.
32. The method of claim 22 wherein the fines comprise iron ore fines, the unblinding agent comprises an aqueous solution of an organophosphonic acid or water soluble salt thereof, and the method further comprises adding a reducing agent.
33. The method of claim 22 wherein the unblinding agent comprises C4-C7 dicarboxylic acids.
34. The method of claim 22 wherein the unblinding agent comprises C -C7 dicarboxylic acids selected from the group consisting of fumaric acid, maleic acid, succinic acid, glutaric acid, adipic acid and pimelic acid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US70652900A | 2000-11-03 | 2000-11-03 | |
| US09/706,529 | 2000-11-03 |
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| WO2002036504A2 true WO2002036504A2 (en) | 2002-05-10 |
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| PCT/US2001/030233 WO2002036504A2 (en) | 2000-11-03 | 2001-09-26 | Method for cleaning blinded filter media and preventing filter blinding |
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| WO (1) | WO2002036504A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007027406A1 (en) * | 2005-08-31 | 2007-03-08 | General Electric Company | Acid mine water demineralization methods |
| WO2014111267A1 (en) * | 2013-01-17 | 2014-07-24 | Archroma Ip Gmbh | System for the removal of iron oxide from surfaces |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4306991A (en) * | 1979-09-18 | 1981-12-22 | Chemed Corporation | Scale inhibition |
| EP0349681A1 (en) * | 1984-08-30 | 1990-01-10 | Petrolite Corporation | Methods for treating hydrocarbon recovery operations and industrial waters |
| US4810405A (en) * | 1987-10-21 | 1989-03-07 | Dearborn Chemical Company, Limited | Rust removal and composition thereof |
| US5053161A (en) * | 1988-06-10 | 1991-10-01 | The Mogul Corporation | Composition for inhibiting scale in water systems |
| SU1699964A1 (en) * | 1990-01-03 | 1991-12-23 | Уральский научно-исследовательский и проектный институт медной промышленности "УНИПРОМЕДЬ" | Method of removing deposits from vacuum filters at concentration plants |
| US5078891A (en) * | 1990-03-08 | 1992-01-07 | Betz Laboratories, Inc. | Method of controlling silica deposition in aqueous systems |
| US5078894A (en) * | 1990-04-30 | 1992-01-07 | Arch Development Corporation | Formulations for iron oxides dissolution |
| US5288410A (en) * | 1991-11-07 | 1994-02-22 | W. R. Grace & Co.-Conn. | Scale control in aqueous systems |
| US6063290A (en) * | 1998-10-01 | 2000-05-16 | Albright & Wilson Americas Inc. | Method for controlling scale using synergistic phosphonate blends |
-
2001
- 2001-09-26 WO PCT/US2001/030233 patent/WO2002036504A2/en active Search and Examination
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007027406A1 (en) * | 2005-08-31 | 2007-03-08 | General Electric Company | Acid mine water demineralization methods |
| WO2014111267A1 (en) * | 2013-01-17 | 2014-07-24 | Archroma Ip Gmbh | System for the removal of iron oxide from surfaces |
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| WO2002036504A3 (en) | 2002-10-10 |
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