CN100398445C - Method for producing high intensity alumina from two extractive liquids in different consistencies - Google Patents
Method for producing high intensity alumina from two extractive liquids in different consistencies Download PDFInfo
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- CN100398445C CN100398445C CNB2006101271754A CN200610127175A CN100398445C CN 100398445 C CN100398445 C CN 100398445C CN B2006101271754 A CNB2006101271754 A CN B2006101271754A CN 200610127175 A CN200610127175 A CN 200610127175A CN 100398445 C CN100398445 C CN 100398445C
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- seminal fluid
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims description 36
- 239000007788 liquid Substances 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000013078 crystal Substances 0.000 claims abstract description 27
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 19
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 210000000582 semen Anatomy 0.000 claims description 37
- 238000005054 agglomeration Methods 0.000 claims description 21
- 230000002776 aggregation Effects 0.000 claims description 21
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 11
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 24
- 229910001570 bauxite Inorganic materials 0.000 abstract description 5
- 229910001648 diaspore Inorganic materials 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 8
- 239000010419 fine particle Substances 0.000 description 7
- 230000000704 physical effect Effects 0.000 description 7
- 238000010791 quenching Methods 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 239000004411 aluminium Substances 0.000 description 5
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910001388 sodium aluminate Inorganic materials 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 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 1
- 239000003518 caustics Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010900 secondary nucleation Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
This invention relates to a method for producing high-strength sand-like aluminum oxide with diasporite bauxite as the raw material. In this invention, a low-concentration refined solution and slurry prepared from aluminum hydroxide fine crystal seeds are efficiently agglomerated in the front part pool of the decomposition flow, and introduced into the back part of the decomposition flow together with a high-concentration refined solution and coarse crystal seeds. The concentrations of the two kinds of refined solution are 110-150 g/L and 170-220 g/l, respectively. The causticity ratios of the two kinds of refined solution are both 1.4-1.6. the volume ratio of the low-concentration and the high-concentration solution is (0.25) : 1. The method can guarantee the balance of the system grain sizes as well as improve the strength of the aluminum oxide product by controlling the concentration of the refined solution and the grain sizes of the fine crystal seeds.
Description
Technical field
Two kinds of extractive liquids in different consistencies are produced the method for high-strength alumina, and relating to a kind of is raw material with the diaspore type bauxite, adopt the method for decomposition of crystal seed production high strength sandy alumina.
Background technology
At present, external sandy alumina production technology mainly contains U.S. aluminium method and method aluminium method.Wherein the former effectively utilizes the mechanism of agglomeration and crystal growth, generally adopts the just gentle lower seed ratio condition of higher decomposition.Method aluminium method decomposition temperature is low, and seed load height, decomposition course are mainly crystal growth mechanism.New in addition auspicious aluminium method is the U.S. aluminium method after improving.It is that the sandy alumina production technique of raw material has bigger limitation with the diaspore type bauxite that these sandy alumina production technologies are used for China.The existing decomposition of crystal seed process using higher concentration seminal fluid of China adds aluminium hydroxide crystal seed, keep the decomposition initial temperature about 60 degree, through 40～60 hours, whole temperature reaches 45～50 degree, thin, the intensity difference (abrasion index is more than 30%) of the aluminum oxide grain size that produces, do not reach the requirement of high quality sandy alumina.This aluminum oxide fine particle content height, easier fragmentation in course of conveying produces more fine particle, flies upward loss seriously, unappeasable requirement.
Application number is that 200410049746 patents adopt the production technique of " high temperature agglomeration, intermediate temperature drop, low temperature grow up, medium contain admittedly ", its purpose performance nodulizing reduces product fine particle content, but the relative degree of supersaturation of high concentration milt aluminum oxide is low, the agglomeration impellent is little, the agglomeration effect might not be obvious, even-45 μ m content are necessarily controlled in the product ,-20 μ m content are difficult to reach the requirement of modern electrolysis process.Application number is that 200410100973 patents have proposed the seminal fluid shunting process, and the agglomerate particle after the agglomeration is mixed with fresh seminal fluid decomposing back segment, and product strength has obtained certain raising.Because agglomeration section seminal concentration height, nodulizing is checked equally.
Summary of the invention
The objective of the invention is at above-mentioned prior art in the deficiency that exists aspect the producing sandy alumina by crystal seed decomposition, a kind of suitable China bauxite resource characteristics and working condition characteristics are proposed, can give full play to low concentration solution degree of supersaturation height, characteristics that the agglomeration impellent is big, produce the method for high strength, sandy alumina that fine particle content is low.
The objective of the invention is to be achieved through the following technical solutions.
Two kinds of extractive liquids in different consistencies are produced the method for high-strength alumina, it is characterized in that the slurries that the thin crystal seed of lower concentration seminal fluid and aluminium hydroxide is prepared into add the first groove of decomposition process leading portion, through merging with high concentration milt again after the agglomeration, add coarse seed and enter the decomposition process back segment together.
Two kinds of extractive liquids in different consistencies are produced the method for high-strength alumina, it is characterized in that lower concentration seminal fluid alumina concentration 110～150 grams per liters, and causticity is than 1.4～1.6; High concentration milt alumina concentration 170～220 grams per liters, causticity are 0.25～1.0: 1 than 1.4～1.6 through lower concentration seminal fluid after the agglomeration and high concentration milt volume ratio.
Two kinds of extractive liquids in different consistencies are produced the method for high-strength alumina, it is characterized in that decomposing 85～70 ℃ of front-end temperatures, and crystal seed contains 50～150 grams per liters admittedly, and granularity is less than 45 μ m content 30%～60%, 2～10 hours resolving times.
Two kinds of extractive liquids in different consistencies are produced the method for high-strength alumina, it is characterized in that: decompose 64～46 ℃ of back segment temperature, crystal seed contains 300～800 grams per liters admittedly, and granularity is less than 45 μ m content 10%～25%, 35～55 hours resolving times.
Method of the present invention is proposing to enter the different decomposition zone after two different seminal concentration shuntings on the basis of patent 200410100973.The crystal seed that conventional bauxite dissolved mineral slurry is adjusted in two different seminal concentration (weighting concentration is constant), the decomposition course when diluting carries out classification, earlier thin crystal seed is added in the lower concentration seminal fluid and decompose, add the coarse seed slurries interflow after the classification with another part high density shunting seminal fluid again and decompose, promptly realize the efficient agglomeration of lower concentration by control seminal concentration, thin crystal seed, guarantee the system granular balance, improve the intensity of product aluminum oxide greatly, produce the fine sandy alumina.
In alumina producing, seek out coarse particles, high-intensity product aluminum oxide must create conditions and help agglomeration and grow up generation.The common recognition that the scholar reaches in the present industry, the particle of pattern structure or false radial structure is after roasting, and the product aluminum oxide abrasion index is low, intensity is high.The pattern structure particle is that fine particle is inlayed and formed under secondary nucleation and cohesion, the effect of agglomeration mechanism, and such particle has further formed the inner agglomerate that is under the effect of growing up, and external growth be the false radial structure particle of year colyliform.Therefore as can be seen, the effective agglomeration that impels microlite in seed precipitation process is the prerequisite that obtains the high strength sandy alumina.Agglomeration process generally is that the preferential agglomeration of fine particle forms bigger particle, and this grade particles agglomeration further takes place forms bigger particle, realizes so successively.The solution degree of supersaturation is the prerequisite that can the decision agglomeration effectively be carried out, and the solution causticity compares α
KWith caustic sodium concentration be the key factor of decision solution degree of supersaturation.According to present alumina producing situation, further reduce causticity and compare α
KIn certain limit, and according to the Production Flow Chart characteristics, adjust sodium aluminate concentrate solution concentration, realize that two seminal concentration subregions enter decomposition process, make the lower concentration seminal fluid of aluminum oxide high degree of supersaturation enter decomposition leading portion part, thin crystal seed agglomeration impellent is big, agglomeration can effectively take place, and then be mixed into the decomposition process back segment with high density part seminal fluid, the decomposed product aluminum oxide grain size is thick, the intensity height, fine particle content is few.Here it is our inventive principle and scheme.
Embodiment
Two kinds of extractive liquids in different consistencies are produced the method for high-strength alumina, lower concentration sodium aluminate concentrate solution and high-concentration sodium aluminate seminal fluid are pressed 0.25～1.0: 1 proportional diverting, the lower concentration seminal fluid alumina concentration that distributes is 110～150 grams per liters, the high concentration milt alumina concentration is 170～220 grams per liters, and causticity is than 1.40～1.60.The lower concentration seminal fluid is with after thin crystal seed mixes, it contains admittedly is 50～150 grams per liters, in temperature is under 85～70 ℃, after at first decomposing 2～10 hours, with coarse seed after high concentration milt adds classification, to contain admittedly be that the slurries of 300～800 grams per liters mix, continue to decompose down at 64～46 ℃ in decomposing back segment, always decompose 37～65 hours time.Slurries after the decomposition go out product aluminium hydroxide according to conventional classification, obtain high-intensity sandy alumina after washing, filtration, roasting.
Below in conjunction with example method of the present invention is further described.
Embodiment 1
Lower concentration seminal fluid and high concentration milt volume ratio are 0.25: 0.75, lower concentration seminal fluid alumina concentration 120 grams per liters, add that to contain admittedly behind the thin crystal seed be 60 grams per liters, decompose 81 ℃ of initial temperature, after 4 hours, reduce to 78 ℃, then quench to 64 ℃, adding aluminum oxide is the high concentration milt of 186.7 grams per liters, it is 500 grams per liters that the adding coarse seed contains admittedly, reduces to 50 ℃ of end temperature again after 44 hours, and the seminal fluid causticity is than 1.46.The aluminium hydroxide product is after roasting, and the physical properties of aluminum oxide is: abrasion index 15.2%, granularity are less than 20 μ m content 0.5%, and granularity is less than 45 μ m content 5.5%.
Embodiment 2
Lower concentration seminal fluid and high concentration milt volume ratio are 0.3: 0.7, lower concentration seminal fluid alumina concentration 120 grams per liters, add that to contain admittedly behind the thin crystal seed be 80 grams per liters, decompose 80 ℃ of initial temperature, after 4 hours, reduce to 77 ℃, then quench to 62 ℃, adding aluminum oxide is the high concentration milt of 191.4 grams per liters, it is 480 grams per liters that the adding coarse seed contains admittedly, reduces to 48 ℃ of end temperature again after 44 hours, and the seminal fluid causticity is than 1.45.The aluminium hydroxide product is after roasting, and the physical properties of aluminum oxide is: abrasion index 14.5%, granularity are less than 20 μ m content 0.4%, and granularity is less than 45 μ m content 6.0%.
Embodiment 3
Lower concentration seminal fluid and high concentration milt volume ratio are 0.3: 0.7, lower concentration seminal fluid alumina concentration 130 grams per liters, add that to contain admittedly behind the thin crystal seed be 100 grams per liters, decompose 82 ℃ of initial temperature, after 4 hours, reduce to 79 ℃, then quench to 63 ℃, adding aluminum oxide is the high concentration milt of 187.1 grams per liters, it is 600 grams per liters that the adding coarse seed contains admittedly, reduces to 49 ℃ of end temperature again after 44 hours, and the seminal fluid causticity is than 1.46.The aluminium hydroxide product is after roasting, and the physical properties of aluminum oxide is: abrasion index 16.8%, granularity are less than 20 μ m content 0.9%, and granularity is less than 45 μ m content 7.0%.
Embodiment 4
Lower concentration seminal fluid and high concentration milt volume ratio are 0.4: 0.6, lower concentration seminal fluid alumina concentration 130 grams per liters, add that to contain admittedly behind the thin crystal seed be 80 grams per liters, decompose 80 ℃ of initial temperature, after 4 hours, reduce to 77 ℃, then quench to 62 ℃, adding aluminum oxide is the high concentration milt of 196.7 grams per liters, it is 500 grams per liters that the adding coarse seed contains admittedly, reduces to 48 ℃ of end temperature again after 44 hours, and the seminal fluid causticity is than 1.45.The aluminium hydroxide product is after roasting, and the physical properties of aluminum oxide is: abrasion index 15.6%, granularity are less than 20 μ m content 0.85%, and granularity is less than 45 μ m content 6.6%.
Embodiment 5
Lower concentration seminal fluid and high concentration milt volume ratio are 0.3: 0.7, lower concentration seminal fluid alumina concentration 140 grams per liters, add that to contain admittedly behind the thin crystal seed be 110 grams per liters, decompose 82 ℃ of initial temperature, after 6 hours, reduce to 79 ℃, then quench to 63 ℃, adding aluminum oxide is the high concentration milt of 182.9 grams per liters, it is 480 grams per liters that the adding coarse seed contains admittedly, reduces to 49 ℃ of end temperature again after 44 hours, and the seminal fluid causticity is than 1.44.The aluminium hydroxide product is after roasting, and the physical properties of aluminum oxide is: abrasion index 14.6%, granularity are less than 20 μ m content 0.75%, and granularity is less than 45 μ m content 7.1%.
Embodiment 6
Lower concentration seminal fluid and high concentration milt volume ratio are 1: 1, lower concentration seminal fluid alumina concentration 140 grams per liters, add that to contain admittedly behind the thin crystal seed be 100 grams per liters, decompose 79 ℃ of initial temperature, after 6 hours, reduce to 76 ℃, then quench to 61 ℃, adding aluminum oxide is the high concentration milt of 200 grams per liters, it is 550 grams per liters that the adding coarse seed contains admittedly, reduces to 47 ℃ of end temperature again after 40 hours, and the seminal fluid causticity is than 1.47.The aluminium hydroxide product is after roasting, and the physical properties of aluminum oxide is: abrasion index 14.2%, granularity are less than 20 μ m content 1.01%, and granularity is less than 45 μ m content 6.7%.
Embodiment 7
Lower concentration seminal fluid and high concentration milt volume ratio are 1: 1, lower concentration seminal fluid alumina concentration 150 grams per liters, add that to contain admittedly behind the thin crystal seed be 120 grams per liters, decompose 80 ℃ of initial temperature, after 8 hours, reduce to 77 ℃, then quench to 62 ℃, adding aluminum oxide is the high concentration milt of 190 grams per liters, it is 600 grams per liters that the adding coarse seed contains admittedly, reduces to 48 ℃ of end temperature again after 40 hours, and the seminal fluid causticity is than 1.44.The aluminium hydroxide product is after roasting, and the physical properties of aluminum oxide is: abrasion index 16.5%, granularity are less than 20 μ m content 1.3%, and granularity is less than 45 μ m content 8.2%.
Claims (4)
1. two kinds of extractive liquids in different consistencies are produced the methods of high-strength aluminas, it is characterized in that the slurries that the thin crystal seed of lower concentration seminal fluid and aluminium hydroxide is prepared into add the first groove of decomposition process leading portion, through merging with high concentration milt again after the agglomeration, add coarse seed and enter the decomposition process back segment together.
2. two kinds of extractive liquids in different consistencies according to claim 1 are produced the method for high-strength alumina, it is characterized in that lower concentration seminal fluid alumina concentration 110～150 grams per liters, and causticity is than 1.4～1.6; High concentration milt alumina concentration 170～220 grams per liters, causticity are 0.25～1.0: 1 than 1.4～1.6 through lower concentration seminal fluid after the agglomeration and high concentration milt volume ratio.
3. two kinds of extractive liquids in different consistencies according to claim 1 are produced the method for high-strength alumina, it is characterized in that decomposing 85～70 ℃ of front-end temperatures, and crystal seed contains 50～150 grams per liters admittedly, and granularity is less than 45 μ m content 30%～60%, 2～10 hours resolving times.
4. two kinds of extractive liquids in different consistencies according to claim 1 are produced the method for high-strength alumina, it is characterized in that: decompose 64～46 ℃ of back segment temperature, crystal seed contains 300～800 grams per liters admittedly, and granularity is less than 45 μ m content 10%～25%, 35～55 hours resolving times.
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| CN104495890A (en) * | 2014-12-11 | 2015-04-08 | 昆明冶金研究院 | Recycling process of sodium aluminate solution in aluminum-air battery preparation process |
| CN115124057B (en) * | 2022-07-01 | 2023-11-07 | 中国铝业股份有限公司 | High-fluidity alumina and preparation method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4305913A (en) * | 1980-08-06 | 1981-12-15 | Kaiser Aluminum & Chemical Corporation | Alumina hydrate production from Bayer liquor by seeding |
| US4311486A (en) * | 1979-08-13 | 1982-01-19 | Sumitomo Aluminium Smelting Company, Limited | Process for producing coarse grains of aluminum hydroxide |
| US4511542A (en) * | 1984-05-24 | 1985-04-16 | Kaiser Aluminum & Chemical Corporation | Bayer process production of alumina hydrate |
| US4512959A (en) * | 1982-09-02 | 1985-04-23 | Alcoa Chemie Gmbh | Method for the recovery of alumina |
| EP0344469A2 (en) * | 1988-06-03 | 1989-12-06 | Vereinigte Aluminium-Werke Aktiengesellschaft | Process for the production of agglomerates of aluminium hydroxide having a large grain size |
| EP0445543A1 (en) * | 1990-02-07 | 1991-09-11 | Vereinigte Aluminium-Werke Aktiengesellschaft | Process for the preparation of coarse grained alumunium hydroxyde particles |
| US6296819B1 (en) * | 1998-10-28 | 2001-10-02 | Alusuisse Technology & Management Ltd. | Process for the manufacture of coarse aluminium hydroxide |
| CN1631786A (en) * | 2004-12-28 | 2005-06-29 | 中国铝业股份有限公司 | Process for producing sandy alumina by crystal seed decomposition |
-
2006
- 2006-09-11 CN CNB2006101271754A patent/CN100398445C/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4311486A (en) * | 1979-08-13 | 1982-01-19 | Sumitomo Aluminium Smelting Company, Limited | Process for producing coarse grains of aluminum hydroxide |
| US4305913A (en) * | 1980-08-06 | 1981-12-15 | Kaiser Aluminum & Chemical Corporation | Alumina hydrate production from Bayer liquor by seeding |
| US4512959A (en) * | 1982-09-02 | 1985-04-23 | Alcoa Chemie Gmbh | Method for the recovery of alumina |
| US4511542A (en) * | 1984-05-24 | 1985-04-16 | Kaiser Aluminum & Chemical Corporation | Bayer process production of alumina hydrate |
| EP0344469A2 (en) * | 1988-06-03 | 1989-12-06 | Vereinigte Aluminium-Werke Aktiengesellschaft | Process for the production of agglomerates of aluminium hydroxide having a large grain size |
| EP0445543A1 (en) * | 1990-02-07 | 1991-09-11 | Vereinigte Aluminium-Werke Aktiengesellschaft | Process for the preparation of coarse grained alumunium hydroxyde particles |
| US6296819B1 (en) * | 1998-10-28 | 2001-10-02 | Alusuisse Technology & Management Ltd. | Process for the manufacture of coarse aluminium hydroxide |
| CN1631786A (en) * | 2004-12-28 | 2005-06-29 | 中国铝业股份有限公司 | Process for producing sandy alumina by crystal seed decomposition |
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