CN1149177C - Process for preparing aluminium hydroxide - Google Patents
Process for preparing aluminium hydroxide Download PDFInfo
- Publication number
- CN1149177C CN1149177C CNB001322184A CN00132218A CN1149177C CN 1149177 C CN1149177 C CN 1149177C CN B001322184 A CNB001322184 A CN B001322184A CN 00132218 A CN00132218 A CN 00132218A CN 1149177 C CN1149177 C CN 1149177C
- Authority
- CN
- China
- Prior art keywords
- aluminium hydroxide
- decomposition
- groove
- continuously
- present
- 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.)
- Expired - Lifetime
Links
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229910021502 aluminium hydroxide Inorganic materials 0.000 title claims description 30
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 9
- 239000003034 coal gas Substances 0.000 claims abstract description 7
- 238000001704 evaporation Methods 0.000 claims abstract description 5
- 230000008020 evaporation Effects 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 239000011734 sodium Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 7
- 229910052739 hydrogen Inorganic materials 0.000 claims description 7
- -1 hydrogen aluminum oxide Chemical class 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004062 sedimentation Methods 0.000 claims description 4
- 239000008234 soft water Substances 0.000 claims description 4
- 239000003518 caustics Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 238000010924 continuous production Methods 0.000 abstract 1
- 238000005272 metallurgy Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000012065 filter cake Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 241001062009 Indigofera Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000005432 seston Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention discloses a method for producing aluminum hydroxide. The present invention is characterized in that the decomposition method of sodium aluminate solution is continuous carbonating decomposition technology; wet aluminum hydroxide is dried by adopting a flash evaporation drying technique which uses coal gas as heat sources and utilizes a rotary flashing drier. The method of the present invention has the advantages of continuous production, simple manufacturing process, easy operation control, high yield and low energy consumption; the non metallurgy grade aluminum hydroxide produced by the present invention has the advantages of high chemical purity, high whiteness, low iron oxide content, little subsidiary water, little subsidiary alkali, few flaws and medium particle size; indexes, such as L, a, b values of color tone, etc. are good.
Description
Technical field
The present invention relates to produce a kind of production method of non-metallurgical grade aluminium hydroxide with sodium aluminate solution.
Background technology
The aluminium hydroxide product innovation is mainly used in special trades such as chemical industry fire retardant, building materials coating, advanced ceramic, smart papermaking.And, at present domesticly see following two kinds of having of report about the production method of the non-metallurgical grade oxygen alumina product of this purposes:
1, with the sodium aluminate solution after the desiliconization of alkali-lime sinter process as raw material, after adding CaO and removing ferric oxide, decompose with the interruption carbon method, after the filter filtration of aluminium hydroxide product process and pressure filter washing of separating out, obtain moisture content less than 8% aluminium hydroxide, send into rake formula drying machine drying again, obtain the aluminium hydroxide product.
2, with the sodium aluminate solution in alkali-lime sinter process or the Baeyer-sintering integrated process production process, do crystal seed with aluminium hydroxide and carry out crystal seed stirring decomposition, after dividing the aluminium hydroxide product process filter filtration washing that parses, with the oven dry of cartridge type rotary drying machine, pulverize with ball mill then and obtain the aluminium hydroxide product again.
The shortcoming of the production method of above-mentioned two kinds of non-metallurgical grade aluminium hydroxides is: yield poorly, energy consumption is higher, and the production continuity is relatively poor, unstable product quality.
Content of the present invention
The objective of the invention is to provide a kind of production continuously, manufacturing processed is simple, easy handling control, the production of aluminum hydroxide method that the output high energy consumption is low, non-metallurgical grade aluminium hydroxide product chemical purity height, the whiteness height of being produced by this method, iron oxide content is low, attached water is low, attached alkali is low, fault is few, granularity is moderate, and indexs such as tone L, a, b value all compare well.
For reaching above-mentioned purpose, in processing method of the present invention, what the decomposition method of sodium aluminate solution adopted is the continuous carbonation decomposition technique, and what the oven dry of wet hydrogen aluminum oxide was adopted is the expansion drying new technology of doing thermal source with coal gas.
Concrete grammar is: the refined sodium aluminate solution behind use alkali-lime sinter process deep desilication, its composition is: Al
2O
390-100g/l, causticity Na
2O 85-95g/l, solution caustic ratio (ak) 1.45-1.55, A/S (solution siliceous modulus) 600-900 enters successively equably continuously and divides groove by a plurality of carbon; Feed the CO after purifying continuously
2Gas, and each carbon divides the resolution ratio gradient of groove to increase progressively in regular turn, wherein at the resolution ratio gradient in regular turn of five grooves be 30%, 60%, 75%, 85%, 88-91%, by controlling suitable resolution ratio gradient of each groove and the qualified rate of decomposition of last groove, make qualified decomposition slurries, its decomposition condition is: decomposition temperature 80-90 ℃, and CO
2Gas concentration 35-38%, resolving time 4-5 hour continuously, the qualified rate of decomposition 88-91% of last groove; Then decompose slurries and carry out sedimentation through subsider and rotary drum filter, separate, washing, what washing was adopted is three backflushs of evaporation soft water, water temperature is greater than 78 ℃, aluminium hydroxide water ratio behind the filtration washing is between 10-13%, send into the wet feed storehouse, do thermal source with coal gas, air is entered in the flash dryer after the hotblast stove indirect heating as drying air stream, the wet hydrogen aluminum oxide is delivered to continuously in the kiln of flash dryer and carries out expansion drying, dried aluminium hydroxide attached water is less than 0.1%, aluminium hydroxide enters cyclone with hot gas flow and bagroom carries out gas solid separation, obtains finished product aluminium hydroxide at last.
This shows that the major technique characteristics of production technique of the present invention are:
1, adopts the sodium aluminate solution continuous carbonation new technique for decomposing, can rationally control the decomposition gradient of each groove, guarantee that the chemical purity of degradation production, physicals reach technical requirement.The continuity of producing is good, the operation rate height, and flow is big.Every technical indicator of product is better than being interrupted decomposition technique greatly.
2, the expansion drying technology of doing thermal source with coal gas is adopted in the oven dry of aluminium hydroxide, and its dewatering efficiency height, energy consumption are low, simple to operate, and operation rate height, unit output are big, produce continuously; Aluminium hydroxide is in the expansion drying process in addition, and drying medium is cleaning, and rate of drying is (instantaneous drying) soon, does not destroy the physical property of product, and this L to product shade, a, b value have very big benefit.(L, a, b are the Hunter color coordinates that is used for describing color, and wherein the L value refers to the brightness of color, and a value refers to that from green to red the b value refers to from the Huang to indigo plant).
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
The specific embodiment of the present invention
In conjunction with the accompanying drawings technical process of the present invention is expressed as follows more detailedly: the refined sodium aluminate solution behind alkali-lime sinter process deep desilication, its composition is: Al
2O
390-100g/l, causticity Na
2O 85-95g/l, solution caustic ratio (ak) 1.45-1.55, A/S (solution siliceous modulus) 600-900 enters a plurality of carbon continuously equably and divides groove, feeds the CO after purifying continuously
2Gas, each carbon divide the resolution ratio gradient of groove to increase progressively in regular turn, by controlling suitable resolution ratio gradient of each groove and the qualified rate of decomposition of last groove, make qualified decomposition slurries, and its decomposition condition is: decomposition temperature 80-90 ℃, and CO
2Gas concentration 35-38%, resolving time 4-5 hour continuously, the qualified rate of decomposition 88-91% of end groove, decompose slurries through subsider carry out sedimentation with rotary drum filter, separate, washing, what washing was adopted is three backflushs of evaporation soft water, and water temperature is separated mother liquor and washing lotion and returned main Production Flow Chart greater than 78 ℃, aluminium hydroxide water ratio behind the filtration washing is sent into the wet feed storehouse through overhead traveling crane and belt between 10-13%; Do thermal source with coal gas, air is entered in the flash dryer after the hotblast stove indirect heating as drying air stream; The wet hydrogen aluminum oxide carries out expansion drying in screw feeder is delivered to the kiln of flash dryer continuously, dried aluminium hydroxide attached water is less than 0.1%, aluminium hydroxide enters cyclone with hot gas flow and bagroom carries out gas solid separation, finished product aluminium hydroxide carries out the packing of product after entering the siccative storehouse again, and tail gas carries out emptying after then entering induced draft fan.The technical indicator of the aluminium hydroxide product of the flat footpath particle diameter 75 μ m that obtained is as follows:
Al
2O
3≥64％ SiO
2≤0.035％
Fe
2O
3≤0.01％ Na
2O≤0.3％
Igloss≤35% attached water≤0.1%
Attached alkali≤0.010% whiteness 〉=93%
Tone L 〉=96.3, a=-0.3---+0.3, b＜0.10
Granularity d
50=75 μ m ,+150 μ m≤15% ,-45 μ m≤15%
Fault≤80/200 grams
In sum, the production technique that patent of the present invention adopts be with the wrought aluminum acid sodium solution behind alkali-lime method deep desilication as raw material, produce the aluminium hydroxide product that median size is 75 μ m by continuous carbon branch, Rotary Flash Drying.Its Production Flow Chart is stable, be easy to production operation control, the median size of producing is that the aluminium hydroxide product of 75 μ m has high whiteness, low iron content, low attached water, low attached alkali, low fault and the moderate characteristic of granularity, and the L of its product shade, a, b value all can satisfy domestic and international numerous clients' technical requirements.
Embodiment: get wrought aluminum acid sodium solution behind alkali-lime sinter process deep desilication as raw material, its composition is: Al
2O
394.46g/l, causticity Na
2O 90.3g/l, ak 1.53, and A/S 694, and seston 0.006g/l enters five series connection carbon continuously and divides groove, with the CO that purifies back concentration 36%
2Gas is passed in each groove continuously, decomposition temperature is controlled at 85 ℃, resolving time 4-5 hour, by controlling decomposition gradient (the 1# groove 30% of each groove, 2# groove 60%, 3# groove 75%, 4# groove 85%, it is qualified that the 5# groove decomposes), obtain qualified aluminium hydroxide and decompose slurries, aluminum hydroxide slurry is through the subsider sedimentation, after rotary drum filter filtered, filter cake with three washings of 85 ℃ of evaporations of temperature soft water, was washed the attached alkali of back filter cake less than 0.005% at the secondary filtration machine, attached water is about 10.2%, and fault is less than 24/200 grams.Wet hydrogen aluminum oxide filter cake is sent into wet hydrogen aluminum oxide feed bin through overhead traveling crane and belt.Do thermal source with coal gas, (Shenyang Science and Technology Industrial Technology Inst. makes to make air (203 ℃ of temperature) after the hotblast stove indirect heating enter Rotatingandflashstreamingdrier, model is SKSZ-851) in, the wet hydrogen aluminum oxide carries out drying in screw feeder is delivered to the kiln of drying machine continuously equably, the drying machine temperature out is 96 ℃, material moisture content reduces to 0.06%, carry out the two-stage recovery of gathering dust with cyclone and bagroom again, the aluminium hydroxide product of dried flat footpath particle diameter 75 μ m enters finished bin, and the finished product specification is:
Al
2O
3 65.176％ SiO
2 0.026％
Fe
2O
3 0.004％ Na
2O 0.144％
Igloss 34.65% attached water 0.06%
Attached alkali 0.006% whiteness 93.58%
Tone L=97.04, a=0.23, b=-0.21
Granularity d
50=75.4 μ m ,+150 μ m=12.06% ,-45 μ m=9.0%
Fault 32/200 grams
Moisture among the present invention, igloss, SiO
2, Fe
2O
3, Na
2O numerical value is pressed GB6610.1-86 to GB6610.5-86 method respectively and is measured.L, a, b measure with the color difference analysis instrument PC-PIIG of Beijing Optical Instrument Factory.Other index is to adopt ordinary method mensuration in the aluminium hydroxide production.
Claims (1)
1, a kind of production method of aluminium hydroxide is characterized in that this method is to use the refined sodium aluminate solution behind alkali-lime sinter process deep desilication, and its composition is: Al
2O
390-100g/l, causticity Na
2O85-95g/l, solution caustic ratio ak 1.45-1.55, solution siliceous modulus A/S 600-900 enters it successively equably continuously and divides groove by five carbon; Feed the CO after purifying continuously
2Gas, each carbon divides the resolution ratio gradient of groove to increase progressively in regular turn, wherein the resolution ratio gradient in regular turn of five grooves be 30%, 60%, 75%, 85%, 88-91%, by controlling suitable resolution ratio gradient of each groove and the qualified rate of decomposition of last groove, make qualified decomposition slurries, its decomposition condition is: decomposition temperature 80-90 ℃, and CO
2Gas concentration 35-38%, resolving time 4-5 hour continuously, the qualified rate of decomposition 88-91% of end groove, then decompose slurries and carry out sedimentation through subsider and rotary drum filter, separate, washing, what washing was adopted is three backflushs of evaporation soft water, water temperature is greater than 78 ℃, aluminium hydroxide water ratio behind the filtration washing is between 10-13%, send into the wet feed storehouse, do thermal source with coal gas, air is entered in the Rotatingandflashstreamingdrier after the hotblast stove indirect heating as drying air stream, the wet hydrogen aluminum oxide is delivered to continuously in the kiln of Rotatingandflashstreamingdrier and carries out expansion drying, dried aluminium hydroxide attached water is less than 0.1%, and aluminium hydroxide enters cyclone with hot gas flow and bagroom carries out gas solid separation, obtains finished product aluminium hydroxide at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001322184A CN1149177C (en) | 2000-11-09 | 2000-11-09 | Process for preparing aluminium hydroxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001322184A CN1149177C (en) | 2000-11-09 | 2000-11-09 | Process for preparing aluminium hydroxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1289721A CN1289721A (en) | 2001-04-04 |
| CN1149177C true CN1149177C (en) | 2004-05-12 |
Family
ID=4595053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001322184A Expired - Lifetime CN1149177C (en) | 2000-11-09 | 2000-11-09 | Process for preparing aluminium hydroxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1149177C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018719A (en) * | 2015-08-10 | 2015-11-04 | 中国瑞林工程技术有限公司 | Concentrate processing method and system |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101121540B (en) * | 2007-07-11 | 2010-05-12 | 中国铝业股份有限公司 | Method for treating filter cake generated by electrolysis aluminum and carbon products production waste water treatment system |
| CN101343075B (en) * | 2008-08-22 | 2011-01-26 | 中国铝业股份有限公司 | Control method for b value of sodium aluminate solution |
| CN102020301B (en) * | 2009-09-16 | 2014-03-12 | 白银中天化工有限责任公司 | Aluminium hydroxide drying system |
| CN101792163B (en) * | 2010-04-16 | 2012-02-08 | 中国铝业股份有限公司 | Method for producing high-whiteness aluminum hydroxide by two-stage decomposition method |
| CN102390850B (en) * | 2011-08-04 | 2013-09-25 | 中国铝业股份有限公司 | Carbon-decomposing high-whiteness aluminum hydroxide filler and chromaticity control method thereof |
| CN102303881A (en) * | 2011-08-18 | 2012-01-04 | 中国铝业股份有限公司 | Preparation method of aluminum hydroxide for titanium white |
| CN102390851A (en) * | 2011-08-18 | 2012-03-28 | 中国铝业股份有限公司 | Production method for high-whiteness aluminum hydroxide |
| CN102815734A (en) * | 2012-07-27 | 2012-12-12 | 中国铝业股份有限公司 | Preparation method of easily-dissolvable aluminum hydroxide |
| CN113028768A (en) * | 2021-03-03 | 2021-06-25 | 三门峡义翔铝业有限公司 | Treatment process for drying alumina by dry method and drying system |
| CN113233483A (en) * | 2021-05-22 | 2021-08-10 | 邹平恒嘉新材料科技有限公司 | Preparation method of nano boehmite material |
| CN113443641A (en) * | 2021-06-29 | 2021-09-28 | 临汾市倍安特制药有限公司 | Preparation method of pharmaceutical-grade aluminum hydroxide |
-
2000
- 2000-11-09 CN CNB001322184A patent/CN1149177C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018719A (en) * | 2015-08-10 | 2015-11-04 | 中国瑞林工程技术有限公司 | Concentrate processing method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1289721A (en) | 2001-04-04 |
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