CN101580255A - Aluminate hydrate wash liquor digestion method in manufacturing process of aluminium oxide by sintering method - Google Patents
Aluminate hydrate wash liquor digestion method in manufacturing process of aluminium oxide by sintering method Download PDFInfo
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- CN101580255A CN101580255A CNA2009100860505A CN200910086050A CN101580255A CN 101580255 A CN101580255 A CN 101580255A CN A2009100860505 A CNA2009100860505 A CN A2009100860505A CN 200910086050 A CN200910086050 A CN 200910086050A CN 101580255 A CN101580255 A CN 101580255A
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- China
- Prior art keywords
- wash liquor
- aluminum hydroxide
- liquor
- digestion
- hydroxide wash
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- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 64
- 238000005245 sintering Methods 0.000 title claims abstract description 24
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 230000029087 digestion Effects 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 150000004645 aluminates Chemical class 0.000 title abstract 5
- 238000001704 evaporation Methods 0.000 claims abstract description 25
- 230000008020 evaporation Effects 0.000 claims abstract description 25
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 51
- 238000001556 precipitation Methods 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 11
- 239000012141 concentrate Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 abstract description 12
- 239000003518 caustics Substances 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 7
- 239000002002 slurry Substances 0.000 abstract description 3
- 238000010517 secondary reaction Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000012452 mother liquor Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 26
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 5
- 238000005507 spraying Methods 0.000 description 4
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 2
- 210000000582 semen Anatomy 0.000 description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to an aluminate hydrate wash liquor digestion method in the manufacturing process of an aluminium oxide by a sintering method, which is characterized in that the method comprises the following steps: the aluminate hydrate wash liquor is evaporated and concentrated, and then enters a seed separation evaporator for evaporation, and serves as ingredients with seed separation mother liquor in the desilication process. In the method, the aluminate hydrate wash liquor in the sintering method drops out of the clinker digestion correction liquor, is directly sent to the evaporator for evaporation after being sprayed, evaporated and concentrated in a clinker kiln cooler, and is used as the seed separation liquor, thus optimizing the digestion, separation and washing techniques of the sintering method, truly realizing the technique requirement of low caustic ratio digestion, reducing the occurrence of secondary reaction of the system, being advantageous for the stability of slurry index and the high-yield and steady operation of the clinker kiln, being capable of decreasing the crude liquor ak value by 0.02 under the condition of unchanged clinker [N/R], improving the net digestion rate of the aluminium oxide by as high as 0.5%, solving the problem of the destination of aluminate hydrate wash liquor fundamentally.
Description
Technical field
The present invention relates to aluminum hydroxide wash liquor digestion method in a kind of alumina by sintering production process.
Background technology
Produce in the alumina technology in sintering process, grog after chamotte kiln burns till carries out stripping and red mud separating, washing, in the sodium aluminate solution production that this process produced, be referred to as thick liquid, decompose after the thick further desiliconization of liquid is refining, sodium aluminate solution decomposes the back and produces aluminum hydroxide slurry, aluminum hydroxide slurry arrives last procedure then through separating, washing.Derive from the washing lotion that produces in the aluminium hydroxide washing process and be aluminum hydroxide wash liquor, be commonly called as white washing.
Aluminum hydroxide wash liquor is produced in the alumina process in sintering process and is used as one of adjustment liquid composition of grog stripping always, and its aK value has improved the caustic ratio in the grog process in leaching about 3.0.When if the aluminum hydroxide wash liquor that the grog stripping is consumed measures existing considerable change, will cause occurring between thick liquid aK and the grog [N/R] inconsistent, under the higher situation of thick liquid aK, red mud separates and the washing system secondary reaction can obviously increase, worsening appears in the separator tank condition, it is molten only to reduce aluminum oxide, and later the white residue amount increases, and influences the stability of charge pulp.And the living grog [N/R] that is forced to need to adjust in the last process supplied materials is filled a prescription, and is unfavorable for the steady running of chamotte kiln.
Thick liquid need carry out further desiliconization, could satisfy the processing requirement of follow-up decomposition process.In order to keep the stability of solution in desiliconization process, must allocate an amount of seed precipitation solution into and improve its caustic ratio.And seed precipitation solution is consistent with the aK value of aluminum hydroxide wash liquor, and both differences are the difference on the concentration, and the full alkali (NT) of seed precipitation solution is 135 grams per liters, and aluminum hydroxide wash liquor NT only is 50 grams per liters.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists at above-mentioned prior art, provide a kind of and can effectively optimize sintering process stripping, separation, washing process, realize low caustic ratio stripping, reduce the generation of secondary system reaction, eliminate aluminum hydroxide wash liquor and advance the influence of stripping, help the aluminum hydroxide wash liquor digestion method in the alumina by sintering production process of moving with the high and stable yields of chamotte kiln of stablizing of slip index thick liquid ak.
The objective of the invention is to be achieved through the following technical solutions.
Aluminum hydroxide wash liquor digestion method in a kind of alumina by sintering production process is characterized in that its process is after aluminum hydroxide wash liquor is evaporated, concentrates, and then enters kind of a branch evaporator evaporation, together is used for the desiliconization process batching with seed precipitation solution.
Aluminum hydroxide wash liquor digestion method in a kind of alumina by sintering production process of the present invention is characterized in that described aluminum hydroxide wash liquor evaporates, concentration process, and the full alkali concn of the aluminum hydroxide wash liquor after the evaporation is 95-115g/L.
Aluminum hydroxide wash liquor digestion method in a kind of alumina by sintering production process of the present invention is characterized in that described aluminum hydroxide wash liquor evaporates, concentration process is realized evaporation concentration by absorbing chamotte kiln cooler heat.
Method of the present invention, aluminum hydroxide wash liquor is sent to the chamotte kiln cooler earlier as the spray heat-eliminating medium by the aluminium hydroxide separation circuit, can adopt the above cooler of separate unit or separate unit to evaporate, send to evaporization process again after concentrating, after evaporation, return the desiliconization process batching with seed precipitation solution, do not participate in the grog process in leaching.Aluminum hydroxide wash liquor after evaporation adds desiliconization process, does not influence the concentration and the aK value of seminal fluid.The aluminum hydroxide wash liquor evaporation, concentrate then, enter kind of a branch evaporator evaporation, together being used for the desiliconization process batching with seed precipitation solution delivers to, optimized the sintering process stripping, separate, washing process, really realized low this processing requirement of caustic ratio stripping, reduced the generation of secondary system reaction, eliminate aluminum hydroxide wash liquor and advance the influence of stripping thick liquid ak, further distinct grog alkali compares the corresponding relation with thick liquid ak, help the high and stable yields operation of the stable and chamotte kiln of slip index, under the constant situation of grog [N/R], can reduce thick liquid ak value 0.02, the fluctuation range of thick liquid ak is contracted to 0.04 by former 0.10, improves the aluminum oxide net digestion efficiency and reaches 0.5%.Help making full use of the heat energy of chamotte kiln simultaneously, reach UTILIZATION OF VESIDUAL HEAT IN.Fundamentally solve the whereabouts problem of aluminum hydroxide wash liquor.Aluminum hydroxide wash liquor burns till workshop cooler spraying and sprinkling evaporation by grog, absorbs the grog surplus heat, sends to evaporization process after evaporation concentration again, returns the desiliconization process batching with seed precipitation solution after evaporation, does not change seminal concentration and aK value.Technological process is simple, processing ease.
Embodiment
Aluminum hydroxide wash liquor digestion method in a kind of alumina by sintering production process, its process is after aluminum hydroxide wash liquor is evaporated, concentrates, and then enter kind of a branch evaporator evaporation, the full alkali concn of aluminum hydroxide wash liquor after the evaporation is 95-115g/L, together is used for the desiliconization process batching with seed precipitation solution.
Aluminum hydroxide wash liquor is sent to the chamotte kiln cooler earlier as the spray heat-eliminating medium by the aluminium hydroxide separation circuit, can adopt the above cooler of separate unit or separate unit to evaporate, send to evaporization process again after concentrating, after evaporation, return the desiliconization process batching, do not participate in the grog process in leaching with seed precipitation solution.Aluminum hydroxide wash liquor after evaporation adds desiliconization process, does not influence the concentration and the aK value of seminal fluid.
Embodiment 1
Aluminum hydroxide wash liquor in the sintering process production is not participated in the technology that liquid is adjusted in the grog stripping, with the spraying and sprinkling evaporation of aluminum hydroxide wash liquor through the chamotte kiln cooler, after concentrating, full alkali concn is brought up to 100g/L by 45g/L, deliver to kind of a branch evaporator evaporation then, it is used as seed precipitation solution, be used for the desiliconization process batching, further optimized the sintering process stripping, separate, washing process, really realized low this processing requirement of caustic ratio stripping, reduced the generation of secondary system reaction, eliminate aluminum hydroxide wash liquor and advance the influence of stripping thick liquid ak, further distinct grog alkali compares the corresponding relation with thick liquid ak, help the high and stable yields operation of the stable and chamotte kiln of slip index, under the constant situation of grog [N/R], can reduce thick liquid ak value 0.02, the fluctuation range of thick liquid ak is contracted to 0.04 by former 0.10, improves the aluminum oxide net digestion efficiency and reaches 0.5%.Help making full use of the heat energy of chamotte kiln simultaneously, reach UTILIZATION OF VESIDUAL HEAT IN.Fundamentally solve the whereabouts problem of aluminum hydroxide wash liquor.
Embodiment 2
Aluminum hydroxide wash liquor in the sintering process production is not participated in the technology that liquid is adjusted in the grog stripping, with the spraying and sprinkling evaporation of aluminum hydroxide wash liquor through the chamotte kiln cooler, after concentrating, full alkali concn is brought up to 95g/L by 46g/L, deliver to kind of a branch evaporator evaporation then, it is used as seed precipitation solution, be used for the desiliconization process batching, further optimized the sintering process stripping, separate, washing process, really realized low this processing requirement of caustic ratio stripping, reduced the generation of secondary system reaction, eliminate aluminum hydroxide wash liquor and advance the influence of stripping thick liquid ak, further distinct grog alkali compares the corresponding relation with thick liquid ak, help the high and stable yields operation of the stable and chamotte kiln of slip index, under the constant situation of grog [N/R], can reduce thick liquid ak value 0.02, the fluctuation range of thick liquid ak is contracted to 0.04 by former 0.10, improves the aluminum oxide net digestion efficiency and reaches 0.5%.Help making full use of the heat energy of chamotte kiln simultaneously, reach UTILIZATION OF VESIDUAL HEAT IN.Fundamentally solve the whereabouts problem of aluminum hydroxide wash liquor.
Embodiment 3
Aluminum hydroxide wash liquor in the sintering process production is not participated in the technology that liquid is adjusted in the grog stripping, with the spraying and sprinkling evaporation of aluminum hydroxide wash liquor through the chamotte kiln cooler, after concentrating, full alkali concn is brought up to 115g/L by 45g/L, deliver to kind of a branch evaporator evaporation then, it is used as seed precipitation solution, be used for the desiliconization process batching, further optimized the sintering process stripping, separate, washing process, really realized low this processing requirement of caustic ratio stripping, reduced the generation of secondary system reaction, eliminate aluminum hydroxide wash liquor and advance the influence of stripping thick liquid ak, further distinct grog alkali compares the corresponding relation with thick liquid ak, help the high and stable yields operation of the stable and chamotte kiln of slip index, under the constant situation of grog [N/R], can reduce thick liquid ak value 0.02, the fluctuation range of thick liquid ak is contracted to 0.04 by former 0.10, improves the aluminum oxide net digestion efficiency and reaches 0.5%.Help making full use of the heat energy of chamotte kiln simultaneously, reach UTILIZATION OF VESIDUAL HEAT IN.Fundamentally solve the whereabouts problem of aluminum hydroxide wash liquor.
Claims (3)
1. aluminum hydroxide wash liquor digestion method in the alumina by sintering production process is characterized in that its process is after aluminum hydroxide wash liquor is evaporated, concentrates, and then enters kind of a branch evaporator evaporation, with seed precipitation solution-with being used for the desiliconization process batching.
2. aluminum hydroxide wash liquor digestion method in a kind of alumina by sintering production process according to claim 1 is characterized in that described aluminum hydroxide wash liquor evaporates, concentration process, and the full alkali concn of the aluminum hydroxide wash liquor after the evaporation is 95-115g/L.
3. aluminum hydroxide wash liquor digestion method in a kind of alumina by sintering production process according to claim 1 is characterized in that described aluminum hydroxide wash liquor evaporates, concentration process is realized evaporation concentration by absorbing chamotte kiln cooler heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100860505A CN101580255A (en) | 2009-06-01 | 2009-06-01 | Aluminate hydrate wash liquor digestion method in manufacturing process of aluminium oxide by sintering method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100860505A CN101580255A (en) | 2009-06-01 | 2009-06-01 | Aluminate hydrate wash liquor digestion method in manufacturing process of aluminium oxide by sintering method |
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| CN101580255A true CN101580255A (en) | 2009-11-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811710A (en) * | 2010-04-19 | 2010-08-25 | 中国铝业股份有限公司 | Method for inhibiting secondary reaction in sintering method aluminium oxide clinker dissolution process |
| CN102432050A (en) * | 2011-09-30 | 2012-05-02 | 中国铝业股份有限公司 | Method for improving alumina concentration of crude liquid obtained by sintering method |
-
2009
- 2009-06-01 CN CNA2009100860505A patent/CN101580255A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101811710A (en) * | 2010-04-19 | 2010-08-25 | 中国铝业股份有限公司 | Method for inhibiting secondary reaction in sintering method aluminium oxide clinker dissolution process |
| CN102432050A (en) * | 2011-09-30 | 2012-05-02 | 中国铝业股份有限公司 | Method for improving alumina concentration of crude liquid obtained by sintering method |
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Open date: 20091118 |