US20040089103A1 - Method for the removal of calcium from a zinc process sulfate solution - Google Patents
Method for the removal of calcium from a zinc process sulfate solution Download PDFInfo
- Publication number
- US20040089103A1 US20040089103A1 US10/471,533 US47153303A US2004089103A1 US 20040089103 A1 US20040089103 A1 US 20040089103A1 US 47153303 A US47153303 A US 47153303A US 2004089103 A1 US2004089103 A1 US 2004089103A1
- Authority
- US
- United States
- Prior art keywords
- solution
- calcium
- anhydrite
- zinc
- gypsum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000011575 calcium Substances 0.000 title claims abstract description 60
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000011701 zinc Substances 0.000 title claims abstract description 31
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 30
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 8
- 238000000746 purification Methods 0.000 claims abstract description 31
- 238000002386 leaching Methods 0.000 claims abstract description 23
- 239000012141 concentrate Substances 0.000 claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 56
- 229910052925 anhydrite Inorganic materials 0.000 claims description 49
- 239000013078 crystal Substances 0.000 claims description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 238000001556 precipitation Methods 0.000 claims description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 238000005868 electrolysis reaction Methods 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 4
- 229910052602 gypsum Inorganic materials 0.000 description 43
- 239000010440 gypsum Substances 0.000 description 43
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 13
- 229960001763 zinc sulfate Drugs 0.000 description 13
- 229910000368 zinc sulfate Inorganic materials 0.000 description 13
- 230000000694 effects Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910052598 goethite Inorganic materials 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 2
- 229910052935 jarosite Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
- C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
- C22B19/26—Refining solutions containing zinc values, e.g. obtained by leaching zinc ores
-
- 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
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
- C22B3/44—Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
-
- 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 a method for removing calcium from a sulfate solution in the zinc production process. Calcium is removed as an anhydrite from the raw solution coming from concentrate or ore leaching before the solution purification stages.
- Calcium may enter hydrometallurgical process solutions along with the concentrate or ore fed into the process as raw material. Another alternative is that the calcium enters the solution from the dissolution of lime used in process solution neutralization. In that case the situation often arises at some process stage that the solution is over-saturated with regard to gypsum and that gypsum starts to precipitate onto the process equipment.
- Sulphidic zinc concentrates or ores are generally processed either by roasting the concentrate first into oxidic form and leaching the generated calcine using a sulfuric acid solution from zinc electrolysis in order to obtain a zinc sulfate solution, or by routing the sulphidic concentrate or oxidic ore directly to leaching without roasting.
- the zinc sulfate solution obtained from leaching is known as the raw solution, which is purified from other metals and impurities in various stages of solution purification before being routed to electrolysis for the production of pure zinc.
- the iron contained in the concentrate and ore remains insoluble and forms an iron precipitate, which can be jarosite, goethite or hematite and which is removed from the leaching cycle.
- the raw solution coming from leaching has a temperature of around 75-100° C.
- impurities that could affect the quality of the zinc or the electricity consumption of the electrolysis have to be removed from the raw solution. This is done in several, usually three separate solution purification stages. If the solution is got to cool down too much in these stages, gypsum may start to precipitate out from the solution, harming the process itself and causing extra maintenance costs. In order to avoid gypsum precipitation, the solution purification stages have to be performed at a high enough temperature, and this temperature requirement is considered a significant limitation on the use and development of the various stages.
- gypsum is generally removed after solution purification by cooling the solution to about 40° C. in the presence of gypsum nuclei. This is a natural answer, since the solution has in any case to be cooled before going to electrolysis.
- the precipitated gypsum is circulated as precipitation nuclei back to the cooling stage, the calcium content of the solution attains a level that does not cause problems in electrolysis.
- the difficulty with a calcium removal step after solution purification is the fact that the high calcium content of the raw solution may cause problems already in the solution purification stage. Gypsum precipitation due to the high calcium content of the raw solution increases maintenance requirements for the piping and equipment.
- Calcium is usually removed from a sulfate solution as gypsum, CaSO 4 .2H 2 O. Calcium sulfate does however have two other forms, where the amount of crystal water is different: hemihydrate CaSO 4 .0,5H 2 O and anhydrite CaSO 4 , which is the anhydrous form of calcium sulfate.
- hemihydrate CaSO 4 .0,5H 2 O hemihydrate
- CaSO 4 anhydrous form of calcium sulfate.
- the solubility of hemihydrate is so great, at least at temperatures under 100° C., that its appearance in zinc processes is not likely.
- the solubility of gypsum grows as the temperature rises, in other words a zinc concentrate or ore leaching temperature as described above produces 600-850 mg/l calcium in the solution, which precipitates as gypsum as the temperature falls, because the solubility of gypsum in this case falls.
- the solubility of anhydrite falls as the temperature rises and is smaller than the solubility of gypsum for example at the temperatures of the zinc process leaching and solution purification stages.
- An iron-containing zinc raw material such as zinc concentrate, ore or calcine is leached in a sulfuric acid solution in order to obtain a raw solution containing zinc sulfate.
- the solution obtained is routed to electrolysis after the solution purification stages, and the iron is precipitated out from the process as jarosite, goethite or hematite.
- Calcium precipitation is preferably performed from the raw solution before the solution purification stages.
- the temperature of the raw solution coming from leaching is so high (75-100° C.), that it is suitable for anhydrite precipitation and in this way the problems of gypsum formation in the various stages of solution purification are avoided.
- the precipitation of calcium as anhydrite is aided by the use of anhydrite crystals as crystal nuclei.
- FIG. 1 is a graphical representation of the balance solubilities of gypsum and anhydrite obtained by calculation based on thermodynamic values for a typical raw solution from zinc concentrate leaching as a function of temperature,
- FIG. 2 is a graphical representation of the effects of gypsum and anhydrite crystals on a typical raw solution from zinc concentrate leaching as a function of time at a temperature of 85° C.
- FIG. 3 shows a flow sheet of the part of the zinc process concerning calcium precipitation
- FIG. 4 is a graphical representation of the effect of anhydrite on the calcium content of a zinc sulfate solution at different temperatures as a function of time
- FIG. 5 is a graphical comparison of the effect of gypsum and anhydrite on the calcium content of a zinc sulfate solution as a function of time.
- the method of calcium removal according to the present invention is based on the fact that anhydrite crystals are mixed into the impure, hot zinc sulfate solution i.e. raw solution, obtained from the leaching of zinc calcine or concentrate (or oxidic ore).
- the anhydrite crystals act as precipitation nuclei, and the calcium content of the solution tends to set to correspond with the solubility of anhydrite.
- the solubility of anhydrite is smaller than that of gypsum i.e. using this method a solution is obtained from which it is no longer attempted to precipitate gypsum at the solution purification stage.
- the calcium content of the solution to be obtained depends on the reaction time and the available surface area of the anhydrite. Use of this method attains a calcium content of the same order as the usual calcium removal occurring after solution purification, where calcium is removed as gypsum. In practice, a suitable limit has proved to be 400-500 mg Ca/l.
- FIG. 2 presents the effect of gypsum and anhydrite crystals on the calcium content of an ordinary raw solution coming from zinc concentrate leaching, when the temperature is 85° C. and the solids content 50 g/l.
- the solubility of anhydrite is smaller than that of gypsum, the calcium content of the solution did not settle at a level corresponding to the solubility of anhydrite in tests where gypsum crystals were added to the solution. Instead, when using anhydrite crystals, the calcium content of the solution quickly obtained a level below 500 mg/l. This level can be considered quite safe for solution purification. It is also clear from the figure that at the temperature in question calcium removal from the raw solution is already rather effective in the presence of anhydrite crystals.
- anhydrite is the most stable form of calcium sulfate. Therefore there is no fear that the long residence time of the solids could change the anhydrite into other phases. This is also supported by results from production-scale operation: the calcium present in the sediment recycled in cobalt removal and thus resident in the process for a long time is in fact in anhydrite form.
- FIG. 3 presents a method for the removal of calcium from a zinc process according to the invention as a flow sheet.
- the residence time of the solution in the tank depends on the surface area of the anhydrite crystals.
- the solution is routed from the mixing tank to a thickener 3 , where the crystallized anhydrite is separated from the solution as underflow 4 and the clarified solution is routed as overflow 5 to solution purification 6 .
- the zinc sulfate solution is routed to electrolysis for the preparation of elemental zinc (not shown in detail in the drawing).
- the formation of anhydrite crystals directly from the solution is a slow reaction, so that at least part 8 of the anhydrite formed is recirculated to the mixing tank 2 and preferably further via milling 7 , where the particle size can be controlled and new secondary crystal nuclei are produced.
- the advantage of the method now developed is that the calcium content of the raw solution coming from leaching can be lowered without cooling to a level that facilitates the operation of the solution purification stages without disturbances caused by gypsum. At the same time the amount of gypsum precipitating on the process equipment is also reduced.
- the calcium content of the raw solution can be made small enough in this way before solution purification, the process designer and user have more opportunities to decide on the temperature of the different stages of solution purification. This also provides an opportunity for the development of new methods in solution purification.
- Tests were made to investigate the effect of anhydrite on the calcium content of a zinc sulfate solution.
- a raw solution of a zinc plant using the sulfate process included the following substances: Zn 158 g/l, Mg 10 g/l, Mn 5 g/l, NH 4 + 3 g/l and Ca 0.7 g/l.
- the raw solution was heated in separate tests to a temperature of 75, 80, 85 and 90° C. At each temperature the saturation of the solution with regard to gypsum was checked by adding to the hot solution first 1 g/l calcium hydroxide Ca(OH) 2 and then sulfuric acid solution until the pH of the hot solution reached a value of 4.0.
- a sulfate-based zinc process raw solution was used as in example 1 and the effect of anhydrite and gypsum on the calcium content of zinc sulfate was compared at temperatures of 80 and 85° C.
- the solutions were heated in separate tests to the above-mentioned temperatures, and 1 g/l calcium hydroxide Ca(OH) 2 and then sulfuric acid solution was added to each solution, until the pH of the hot solution reached a value of 4.0. 50 g/l of either anhydrite or gypsum crystals were then added. The moment of addition was the starting point of the test and the representative calcium content was measured just before the addition of the anhydrite or gypsum crystals.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Removal Of Specific Substances (AREA)
- Electrolytic Production Of Metals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20010475A FI110268B (fi) | 2001-03-09 | 2001-03-09 | Menetelmä kalsiumin poistamiseksi sinkkiprosessin sulfaattiliuoksista |
| FI20010475 | 2001-03-09 | ||
| PCT/FI2002/000181 WO2002072895A1 (en) | 2001-03-09 | 2002-03-08 | A method for the removal of calcium from a zinc process sulfate solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20040089103A1 true US20040089103A1 (en) | 2004-05-13 |
Family
ID=8560693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10/471,533 Abandoned US20040089103A1 (en) | 2001-03-09 | 2002-03-08 | Method for the removal of calcium from a zinc process sulfate solution |
Country Status (18)
| Country | Link |
|---|---|
| US (1) | US20040089103A1 (zh) |
| EP (1) | EP1366201B1 (zh) |
| JP (1) | JP2004531643A (zh) |
| KR (1) | KR100845171B1 (zh) |
| CN (1) | CN1230564C (zh) |
| AT (1) | ATE314493T1 (zh) |
| AU (1) | AU2002237341B2 (zh) |
| BR (1) | BR0207877A (zh) |
| CA (1) | CA2439914A1 (zh) |
| DE (1) | DE60208349D1 (zh) |
| EA (1) | EA005566B1 (zh) |
| ES (1) | ES2254648T3 (zh) |
| FI (1) | FI110268B (zh) |
| MX (1) | MXPA03008116A (zh) |
| NO (1) | NO20033860D0 (zh) |
| PE (1) | PE20020901A1 (zh) |
| WO (1) | WO2002072895A1 (zh) |
| ZA (1) | ZA200306518B (zh) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755296A (zh) * | 2016-03-29 | 2016-07-13 | 云南华联锌铟股份有限公司 | 从锌湿法冶炼生产的硫酸锌溶液中脱除钙的方法 |
| WO2017109278A1 (en) | 2015-12-21 | 2017-06-29 | Outotec (Finland) Oy | Removal of gypsum from leach solution |
| CN111647911A (zh) * | 2020-03-27 | 2020-09-11 | 昆明理工大学 | 一种脱除电解锰阳极液中镁离子的工艺 |
| CN114836624A (zh) * | 2022-04-20 | 2022-08-02 | 荆门市格林美新材料有限公司 | 一种氯化盐或者硫酸盐溶液的除钙方法 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1884092B (zh) * | 2006-06-29 | 2012-05-30 | 株洲市兴民科技有限公司 | 一种脱除硫酸锌溶液中钙离子的方法 |
| JP5699988B2 (ja) * | 2012-06-12 | 2015-04-15 | 住友金属鉱山株式会社 | 希土類元素の回収方法 |
| CN105819485B (zh) * | 2016-03-29 | 2018-06-22 | 云南华联锌铟股份有限公司 | 从锌冶炼的含酸溶液中产出石膏的方法和装置 |
| CN110964914B (zh) * | 2019-12-30 | 2021-09-03 | 南丹县南方有色金属有限责任公司 | 一种湿法炼锌工艺中除钙镁的方法 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3961908A (en) * | 1974-02-27 | 1976-06-08 | Freeport Minerals Company | Autoclave system for leaching sulfide concentrates |
| US4004991A (en) * | 1975-10-22 | 1977-01-25 | Sherritt Gordon Mines Limited | Two-stage pressure leaching process for zinc and iron bearing mineral sulphides |
| US4423012A (en) * | 1981-12-31 | 1983-12-27 | Hazen Research Incorporated | Manganese and zinc solvent extraction process |
| US4834793A (en) * | 1985-03-19 | 1989-05-30 | Hydrochem Developments Ltd. | Oxidation process for releasing metal values in which nitric acid is regenerated in situ |
| US5820966A (en) * | 1997-12-09 | 1998-10-13 | Inco Limited | Removal of arsenic from iron arsenic and sulfur dioxide containing solutions |
| US5902474A (en) * | 1993-07-29 | 1999-05-11 | Cominco Engineering Services Ltd. | Chloride assisted hydrometallurgical extraction of metal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2225370A1 (en) * | 1997-12-19 | 1999-06-19 | Walter Martin Macdonald | A process for recovering zinc values |
-
2001
- 2001-03-09 FI FI20010475A patent/FI110268B/fi active
-
2002
- 2002-02-22 PE PE2002000149A patent/PE20020901A1/es not_active Application Discontinuation
- 2002-03-08 EA EA200300989A patent/EA005566B1/ru not_active IP Right Cessation
- 2002-03-08 MX MXPA03008116A patent/MXPA03008116A/es active IP Right Grant
- 2002-03-08 EP EP02703647A patent/EP1366201B1/en not_active Expired - Lifetime
- 2002-03-08 BR BR0207877-5A patent/BR0207877A/pt active Search and Examination
- 2002-03-08 JP JP2002571945A patent/JP2004531643A/ja not_active Ceased
- 2002-03-08 CN CNB028062442A patent/CN1230564C/zh not_active Expired - Fee Related
- 2002-03-08 WO PCT/FI2002/000181 patent/WO2002072895A1/en active IP Right Grant
- 2002-03-08 AT AT02703647T patent/ATE314493T1/de not_active IP Right Cessation
- 2002-03-08 CA CA002439914A patent/CA2439914A1/en not_active Abandoned
- 2002-03-08 US US10/471,533 patent/US20040089103A1/en not_active Abandoned
- 2002-03-08 ES ES02703647T patent/ES2254648T3/es not_active Expired - Lifetime
- 2002-03-08 KR KR1020037011812A patent/KR100845171B1/ko not_active Expired - Fee Related
- 2002-03-08 AU AU2002237341A patent/AU2002237341B2/en not_active Ceased
- 2002-03-08 DE DE60208349T patent/DE60208349D1/de not_active Expired - Lifetime
-
2003
- 2003-08-21 ZA ZA200306518A patent/ZA200306518B/en unknown
- 2003-09-01 NO NO20033860A patent/NO20033860D0/no unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3961908A (en) * | 1974-02-27 | 1976-06-08 | Freeport Minerals Company | Autoclave system for leaching sulfide concentrates |
| US4004991A (en) * | 1975-10-22 | 1977-01-25 | Sherritt Gordon Mines Limited | Two-stage pressure leaching process for zinc and iron bearing mineral sulphides |
| US4423012A (en) * | 1981-12-31 | 1983-12-27 | Hazen Research Incorporated | Manganese and zinc solvent extraction process |
| US4834793A (en) * | 1985-03-19 | 1989-05-30 | Hydrochem Developments Ltd. | Oxidation process for releasing metal values in which nitric acid is regenerated in situ |
| US5902474A (en) * | 1993-07-29 | 1999-05-11 | Cominco Engineering Services Ltd. | Chloride assisted hydrometallurgical extraction of metal |
| US5820966A (en) * | 1997-12-09 | 1998-10-13 | Inco Limited | Removal of arsenic from iron arsenic and sulfur dioxide containing solutions |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017109278A1 (en) | 2015-12-21 | 2017-06-29 | Outotec (Finland) Oy | Removal of gypsum from leach solution |
| CN105755296A (zh) * | 2016-03-29 | 2016-07-13 | 云南华联锌铟股份有限公司 | 从锌湿法冶炼生产的硫酸锌溶液中脱除钙的方法 |
| CN111647911A (zh) * | 2020-03-27 | 2020-09-11 | 昆明理工大学 | 一种脱除电解锰阳极液中镁离子的工艺 |
| CN114836624A (zh) * | 2022-04-20 | 2022-08-02 | 荆门市格林美新材料有限公司 | 一种氯化盐或者硫酸盐溶液的除钙方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100845171B1 (ko) | 2008-07-09 |
| JP2004531643A (ja) | 2004-10-14 |
| AU2002237341B2 (en) | 2007-01-25 |
| FI20010475L (fi) | 2002-09-10 |
| CA2439914A1 (en) | 2002-09-19 |
| WO2002072895A1 (en) | 2002-09-19 |
| MXPA03008116A (es) | 2003-12-12 |
| ZA200306518B (en) | 2004-05-10 |
| EA005566B1 (ru) | 2005-04-28 |
| EP1366201B1 (en) | 2005-12-28 |
| CN1496414A (zh) | 2004-05-12 |
| ATE314493T1 (de) | 2006-01-15 |
| FI20010475A0 (fi) | 2001-03-09 |
| DE60208349D1 (de) | 2006-02-02 |
| ES2254648T3 (es) | 2006-06-16 |
| CN1230564C (zh) | 2005-12-07 |
| NO20033860L (no) | 2003-09-01 |
| FI110268B (fi) | 2002-12-31 |
| EA200300989A1 (ru) | 2004-02-26 |
| KR20030096274A (ko) | 2003-12-24 |
| NO20033860D0 (no) | 2003-09-01 |
| PE20020901A1 (es) | 2002-11-28 |
| BR0207877A (pt) | 2004-06-22 |
| EP1366201A1 (en) | 2003-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3976743A (en) | Treatment of zinc plant residue | |
| JP5334592B2 (ja) | 亜鉛浸出工程における希少金属回収方法 | |
| US4676828A (en) | Process for the leaching of sulphides containing zinc and iron | |
| CA1119817A (en) | Method for the recovery of metallic copper | |
| RU2198942C2 (ru) | Способ выщелачивания цинкового концентрата в атмосферных условиях | |
| EP1366201B1 (en) | A method for the removal of calcium from a zinc process sulfate solution | |
| US4305914A (en) | Process for precipitating iron as jarosite with a low non-ferrous metal content | |
| AU2002237341A1 (en) | A method for the removal of calcium from a zinc process sulfate solution | |
| EP2504459A1 (en) | Method for the removal of chloride from zinc sulphate solution | |
| CA1145487A (en) | Removal of radium from aqueous sulphate solutions | |
| US8668761B2 (en) | Method for processing and recycling zinc-rich iron metallurgy side products | |
| US6342189B1 (en) | Method for total precipitation of valuable metals from an acid leaching solution | |
| CN104755640B (zh) | 从铅矿渣回收锌 | |
| ZA200306764B (en) | A method for the precipitation of silica in connection with zinc ore leaching. | |
| US4192852A (en) | Process for precipitating iron as jarosite with a low non-ferrous metal content | |
| AU734903B2 (en) | Metal recovery process | |
| FI122453B (fi) | Menetelmä epäpuhtauksien hallitsemiseksi sinkin valmistusprosessin yhteydessä | |
| EA040885B1 (ru) | Способ извлечения металлов из кобальтсодержащих материалов | |
| MX2008008457A (en) | Method for recovering rare metals in a zinc leaching process | |
| MXPA97009727A (en) | Hydrometalurgical extraction of metal assisted porclor | |
| IE47371B1 (en) | Purification of zinc sulphate solutions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: OUTOKUMPU OYJ, FINLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TALONEN, PANU;REEL/FRAME:014879/0553 Effective date: 20030804 |
|
| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |