CN101219803A - Bauxite dissolving out technique - Google Patents
Bauxite dissolving out technique Download PDFInfo
- Publication number
- CN101219803A CN101219803A CNA2007101161602A CN200710116160A CN101219803A CN 101219803 A CN101219803 A CN 101219803A CN A2007101161602 A CNA2007101161602 A CN A2007101161602A CN 200710116160 A CN200710116160 A CN 200710116160A CN 101219803 A CN101219803 A CN 101219803A
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- CN
- China
- Prior art keywords
- liquid
- stripping
- bauxite
- solid content
- liquor
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910001570 bauxite Inorganic materials 0.000 title claims description 20
- 239000007787 solid Substances 0.000 claims abstract description 20
- 238000004131 Bayer process Methods 0.000 claims abstract description 13
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims description 35
- 239000002002 slurry Substances 0.000 claims description 12
- 238000004090 dissolution Methods 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 11
- 230000029087 digestion Effects 0.000 abstract 5
- 239000000463 material Substances 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 1
- 239000012452 mother liquor Substances 0.000 abstract 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 8
- 239000011734 sodium Substances 0.000 description 5
- 239000007790 solid phase Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 3
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 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
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a digestion process of monohydrallite, which belongs to a technical field. The invention consists of decomposition and digestion, which is characterized in that: before the temperature of digestion liquor of Bayer Process drops, the adjusting liquor is added to reduce the solid content; wherein, the adjusting liquor is a mixture of one or two or three components among the digestion green liquor, the red mud wash liquor or the decomposition mother liquor by an arbitrary proportion. Materials proportion of ore can be increased when digesting the materials; the capacity of monohydrallite batch processing can be improved and the digestion rate of the alumina can be increased.
Description
Technical field
The present invention relates to a kind of dissolving-out process of bauxite, belong to technical field of alumina production.
Background technology
Bayer process is used to handle low silicon bauxite and carries out the production of aluminum oxide, and particularly when handling gibbsitic bauxite, flow process is simple, and operation is convenient, and its economical effectiveness is much larger than other method.
The Bayer process circulation comprises two main processes, the one, and sodium aluminate solution adds the aluminium hydroxide crystal seed branch and parses aluminium hydroxide, is called decomposition course, and the 2nd, the hydrated alumina in decomposition nut liquid (seed precipitation solution) the stripping bauxite after the heating is called process in leaching.Be used alternatingly these two processes and just can handle bauxite a collection ofly, therefrom draw pure aluminium hydroxide product, constitute the Bayer circulation.
When existing bayer process is prepared burden in the ore stripping, for guaranteeing the solubility rate and the alumina concentration of ore oxidation aluminium, ore-burden [Na
2O]/[Al
2O
3] generally about 1.40, otherwise partial oxidation aluminium can't stripping, has had a strong impact on digesting efficiency of alumina.
Summary of the invention
The object of the present invention is to provide a kind of dissolving-out process of bauxite, can when stripping is prepared burden, improve the ore-burden ratio, improve the ability of batch processed bauxite, improve digesting efficiency of alumina.
According to stripping slurries Na
2O-Al
2O
3-H
2O-S (solid phase) system theory, the alumina concentration of system is subjected to the restriction of solid phase (red mud) content.Obtain the stripping slurries of lower molecular ratio, the solid content of the red mud of necessary reduction system.Yet the red mud amount of aluminum oxide output per ton is certain, under existing dissolving-out process, and the about 100-160g/l of the solid content of system, about 100 ℃ of the system temperature of this moment, the about 170-200g/l of caustic sodium concentration, Na in the solution
2O/Al
2O
3About molecular ratio 1.40, that is to say, the dissolution fluid alumina concentration, perhaps molecular ratio is the restriction that is subjected to slurry solid content (red mud amount).Yet finish in stripping, when temperature was 150 ℃ (perhaps 260 ℃), the solidus curve of this moment was owing to the temperature height, and the solidus curve of this moment is higher.Therefore, should finish, contain admittedly towards dilute solution before the cooling in the stripping insulation.
The dissolving-out process of bauxite of the present invention comprises and decomposing and stripping, it is characterized in that adding adjustment liquid and reduce solid content before the cooling of Bayer process dissolution fluid.
Reduce the solid content in the solution, promptly reduced the effect of red mud solid phase, the branch that has suppressed aluminum oxide parses, and has guaranteed the dissolution efficiency of aluminum oxide, can finish process in leaching under low alkali batching condition.
Wherein:
The arbitrary proportion of adjusting liquid and be one or both or three kinds in the thick liquid of stripping, red mud wash liquor or the decomposition nut liquid etc. mixes, and in practice, determines to get final product according to needs of production.
The slurry solid content that adding is adjusted behind the liquid is that 50-90g/l, molecular ratio are 1.05-1.45, guarantees that the slurries aluminum oxide has higher alumina concentration and lower molecular ratio is arranged.
The invention enables [the Na of ore stripping batching
2O]/[Al
2O
3] ratio can be reduced to 1.2 by 1.4, even below 1.2, thereby can when preparing burden, stripping improve the ore-burden ratio, improved the ability of batch processed bauxite, have good result of extraction, and improved digesting efficiency of alumina.
The present invention is by reducing the effect of red mud solid phase, realized the low alkali prescription processing of Bayer process bauxitic ore, the branch that has suppressed aluminum oxide parses, thereby guaranteed the dissolution efficiency of aluminum oxide, under low alkali batching condition, finished process in leaching, and improved the batch processed ore amount, can under original flow process condition, improve the throughput of aluminum oxide, improved digesting efficiency of alumina.
Description of drawings
Fig. 1, process flow diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1
The dissolving-out process of bauxite of the present invention comprises decomposition and stripping, and liquid reduction solid content is adjusted in adding before the Bayer process dissolution fluid is lowered the temperature, and wherein, adjustment liquid is that the slurry solid content behind the thick liquid adding of the stripping adjustment liquid is that 70g/l, molecular ratio are 1.25.
Embodiment 2
The dissolving-out process of bauxite of the present invention comprises decomposition and stripping, and liquid reduction solid content is adjusted in adding before the Bayer process dissolution fluid is lowered the temperature, and wherein, adjustment liquid is that the slurry solid content behind the red mud wash liquor adding adjustment liquid is that 60g/l, molecular ratio are 1.15.
Embodiment 3
The dissolving-out process of bauxite of the present invention comprises and decomposing and stripping, adds to adjust liquid reduction solid content before the Bayer process dissolution fluid is lowered the temperature, and wherein, adjusting liquid is in the decomposition nut liquid, and the slurry solid content that adding is adjusted behind the liquid is that 80g/l, molecular ratio are 1.40.
Embodiment 4
The dissolving-out process of bauxite of the present invention, comprise and decomposing and stripping, before the cooling of Bayer process dissolution fluid, add and adjust liquid reduction solid content, wherein, adjust liquid and be thick liquid of stripping and red mud wash liquor volume to meromict, add the slurries of adjusting behind the liquid measure admittedly for 85g/l, molecular ratio be 1.28.
Embodiment 5
The dissolving-out process of bauxite of the present invention, comprise and decomposing and stripping, before the cooling of Bayer process dissolution fluid, add and adjust liquid reduction solid content, wherein, adjust liquid and be red mud wash liquor and decomposition nut liquid with 2: 1 mixed of volume ratio, adding the slurry solid content of adjusting behind the liquid is that 65g/l, molecular ratio are 1.20.
Embodiment 6
The dissolving-out process of bauxite of the present invention, comprise and decomposing and stripping, before the cooling of Bayer process dissolution fluid, add and adjust liquid reduction solid content, wherein, adjust liquid and be the thick liquid of stripping, red mud wash liquor and decomposition nut liquid with 1: 2: 1 mixed of volume ratio, adding the slurry solid content of adjusting behind the liquid is that 60g/l, molecular ratio are 1.36.
Claims (3)
1. the dissolving-out process of a bauxite comprises and decomposing and stripping, it is characterized in that adding adjustment liquid and reduce solid content before the cooling of Bayer process dissolution fluid.
2. the dissolving-out process of bauxite according to claim 1, the arbitrary proportion that it is characterized in that adjusting liquid and be one or both or three kinds in the thick liquid of stripping, red mud wash liquor or the decomposition nut liquid mixes.
3. the dissolving-out process of bauxite according to claim 1 and 2, it is characterized in that adding the slurry solid content of adjusting behind the liquid is that 50-90g/l, molecular ratio are 1.05-1.45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101161602A CN101219803A (en) | 2007-12-11 | 2007-12-11 | Bauxite dissolving out technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101161602A CN101219803A (en) | 2007-12-11 | 2007-12-11 | Bauxite dissolving out technique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101219803A true CN101219803A (en) | 2008-07-16 |
Family
ID=39629929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101161602A Pending CN101219803A (en) | 2007-12-11 | 2007-12-11 | Bauxite dissolving out technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101219803A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102009991A (en) * | 2010-12-30 | 2011-04-13 | 中国铝业股份有限公司 | Method for producing aluminum oxide by Bayer process |
| CN112919511A (en) * | 2019-12-05 | 2021-06-08 | 沈阳铝镁设计研究院有限公司 | Ultra simple bayer process |
-
2007
- 2007-12-11 CN CNA2007101161602A patent/CN101219803A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102009991A (en) * | 2010-12-30 | 2011-04-13 | 中国铝业股份有限公司 | Method for producing aluminum oxide by Bayer process |
| CN112919511A (en) * | 2019-12-05 | 2021-06-08 | 沈阳铝镁设计研究院有限公司 | Ultra simple bayer process |
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Open date: 20080716 |