CN101734697B - Method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor - Google Patents
Method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor Download PDFInfo
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- CN101734697B CN101734697B CN2009103113797A CN200910311379A CN101734697B CN 101734697 B CN101734697 B CN 101734697B CN 2009103113797 A CN2009103113797 A CN 2009103113797A CN 200910311379 A CN200910311379 A CN 200910311379A CN 101734697 B CN101734697 B CN 101734697B
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- aluminum hydroxide
- organics
- wash liquor
- eliminating
- hydroxide wash
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Abstract
The invention discloses a method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor. The method for causticizing and eliminating the organics by adding the lime milk in the aluminum hydroxide wash liquor is characterized by comprising the steps of: filtering a finished product of aluminum hydroxide to obtain aluminum hydroxide wash liquor; adding liquid alkali into the aluminum hydroxide wash liquor to increase a caustic ratio a k of the solution to over 6, keeping a solution temperature at 70 DEG C; adding the lime milk according to the amount of the organics to perform caustification to produce calcium oxalate; performing solid-liquid separation of the produced calcium oxalate by a subsider; sending causticized residues separated to be settled and separated by red-mud and washed or to be stacked; and performing lime slaking or evaporation on the alkali liquor after the separation. The method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor can effectively reduce the concentration of the organics in the solution so as to reduce the influence of the organics on the production of alumina by a Bayer method and on the product quality.
Description
Technical field
The present invention relates to a kind of alumina producing factory adds the milk of lime causticizing and eliminating organics in aluminum hydroxide wash liquor method.
Background technology
All there is the problem of organic accumulation and harm in most of bayer's process alumina producers.Organism in the bayer liquors is mainly from bauxite, additives such as flocculation agent, defoamer, dewatering agent also can be brought a small amount of organism into, because aluminum hydroxide wash liquor can enter the primary wash liquor of red mud, thereby enter seed precipitation solution, and seed precipitation solution is a round-robin, add that red mud backwater and various sewage enter system, the organism in the Bayer process flow process can accumulate gradually.When organic content is higher in the solution, organism can influence output of a factory, quality product and other technico-economical comparison etc., some organism can cause red-mud settlement scourability variation, reduce decomposition rate and aluminum oxide output capacity, make hydroxide particle-size attenuate, frangible, increase the impurity Na particularly in the product
2Produce a large amount of foams in the content of O, seed precipitation tank, quicken aluminum hydroxide scab in the seed precipitation tank, simultaneously evaporization process is also had bigger influence.By to the organic mensuration of alumina producer, organic content is higher in aluminum hydroxide wash liquor.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of method of adding the milk of lime causticizing and eliminating organics in aluminum hydroxide wash liquor is provided, can effectively eliminate the organic content in the Bayer process solution, reduce the disadvantageous effect that organism causes production, and to the influence of product aluminum oxide quality, to overcome the more high deficiency of the organic content that exists in the prior art.
The present invention is achieved in that by finished product aluminium hydroxide and filters the aluminum hydroxide wash liquor that obtains, and adds liquid base earlier, with the caustic ratio α of solution
kBe increased to more than 6, control solution temperature, and then add milk of lime according to organic amount at 70 ℃, carry out causticization, reaction generates caoxalate, and the caoxalate of generation is through the subsider solid-liquid separation, and isolated causticization slag send red-mud settlement separation and washing or send and store up; Alkali lye after the separation goes ashing or evaporation.
The molecular ratio 1-5 of contained sodium oxalate and yellow soda ash and milk of lime in the solution.
In the said process, the causticization slag can be taken away in the aluminum hydroxide wash liquor about 70～80% organism.
Adopt the present invention, following advantage arranged:
1. significantly reduce organic content in the sodium aluminate solution;
2. reduce the influence of organism to operations such as red-mud settlement, decomposition of crystal seed, evaporations;
3. reduce the influence of organism to product aluminum oxide quality.
Description of drawings
Fig. 1 is a schema of the present invention.
Embodiment
Embodiments of the invention: filter the aluminum hydroxide wash liquor that obtains by finished product aluminium hydroxide, add liquid base earlier, with the caustic ratio α of solution
k(be Na
2O: AL
2O
3Mol ratio) be increased to more than 6, the control solution temperature is at 70 ℃, and then adds milk of lime according to organic amount, carries out causticization, reaction generates caoxalate, reaction formula: Na
2C
2O
4+ CaO → CaC
2O
4+ Na
2O.The molecular ratio 1-5 of contained sodium oxalate and yellow soda ash and milk of lime in the solution.Because calcium aluminate hydrates (or calcium aluminosilicate hydrate) instability that the reaction of milk of lime and sodium aluminate solution generates under high causticity ratio, the high-temperature, and caoxalate is than the easy generation of lime carbonate, can effectively eliminate the oxalate in the solution like this, thereby reduce organic concentration in the solution.The caoxalate that generates is through the subsider solid-liquid separation, and isolated causticization slag send red-mud settlement separation and washing or send and store up.The causticization slag can be taken away in the aluminum hydroxide wash liquor about 70～80% organism.
Claims (1)
1. a method of adding the milk of lime causticizing and eliminating organics in aluminum hydroxide wash liquor is characterized in that: filter the aluminum hydroxide wash liquor that obtains by finished product aluminium hydroxide, add liquid base earlier, with the caustic ratio α of solution
kBe increased to more than 6, control solution temperature, and then add milk of lime according to organic amount at 70 ℃, carry out causticization, reaction generates caoxalate, and the caoxalate of generation is through the subsider solid-liquid separation, and isolated causticization slag send red-mud settlement separation and washing or send and store up; Alkali lye after the separation goes ashing or evaporation; The molecular ratio 1-5 of contained sodium oxalate and yellow soda ash and milk of lime in the solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103113797A CN101734697B (en) | 2009-12-14 | 2009-12-14 | Method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103113797A CN101734697B (en) | 2009-12-14 | 2009-12-14 | Method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101734697A CN101734697A (en) | 2010-06-16 |
| CN101734697B true CN101734697B (en) | 2011-12-28 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103113797A Expired - Fee Related CN101734697B (en) | 2009-12-14 | 2009-12-14 | Method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848446B (en) * | 2012-11-28 | 2016-04-27 | 沈阳铝镁设计研究院有限公司 | A kind of lateral flow causticization method of Bayer process alumina producing and device |
| CN108190927A (en) * | 2018-03-26 | 2018-06-22 | 山东南山铝业股份有限公司 | The method of organic matter removal methods and production aluminium oxide |
| CN111807394B (en) * | 2020-07-24 | 2022-10-28 | 沈阳工业大学 | Method for removing organic matters from Bayer process mother liquor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105494A (en) * | 1985-04-18 | 1986-10-15 | 皮奇尼铝公司 | With the sodium aluminate solution in the method purifying Bel circulation that removes sodium oxalate |
| US5888461A (en) * | 1995-07-20 | 1999-03-30 | Aluminium Pechiney | Process for purifying sodium aluminate solutions containing sodium oxalate |
| CN101302022A (en) * | 2008-06-30 | 2008-11-12 | 中国铝业股份有限公司 | Method for removing sodium oxalate from industrial sodium aluminate solution |
-
2009
- 2009-12-14 CN CN2009103113797A patent/CN101734697B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85105494A (en) * | 1985-04-18 | 1986-10-15 | 皮奇尼铝公司 | With the sodium aluminate solution in the method purifying Bel circulation that removes sodium oxalate |
| US5888461A (en) * | 1995-07-20 | 1999-03-30 | Aluminium Pechiney | Process for purifying sodium aluminate solutions containing sodium oxalate |
| CN101302022A (en) * | 2008-06-30 | 2008-11-12 | 中国铝业股份有限公司 | Method for removing sodium oxalate from industrial sodium aluminate solution |
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| CN101734697A (en) | 2010-06-16 |
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Address after: 100032 Room 309, block C, apricot Road, No. 99, Beijing, Haidian District Patentee after: China Aluminum International Technology Development Co., Ltd. Address before: The 100032 Beijing Financial Street, No. 33 Winton building B block 15 building Patentee before: China Aluminum International Technology Development Co., Ltd. |
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