CN101734696B - Method for removing organic matter by Bayer process - Google Patents
Method for removing organic matter by Bayer process Download PDFInfo
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- CN101734696B CN101734696B CN2009103113782A CN200910311378A CN101734696B CN 101734696 B CN101734696 B CN 101734696B CN 2009103113782 A CN2009103113782 A CN 2009103113782A CN 200910311378 A CN200910311378 A CN 200910311378A CN 101734696 B CN101734696 B CN 101734696B
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Abstract
The invention discloses a method for removing an organic matter by a Bayer process. A fine aluminum hydroxide crystal seed is washed at the first section by aluminum hydroxide lotion and then carries out secondary washing by hot water; the liquid alkali is added into the obtained second section lotion; a caustic specific value of the solution is adjusted to be more than 6; the lime milk is added to carry out causticization reaction, and the causticized slag is separated by a precipitating tank. The invention can effectively reduce the concentration of the organic matter in the solution, thereby reducing the influence on the aluminum oxide production by the Bayer process and the production quality by the organic matter.
Description
Technical field
The present invention relates to the method that organic matter by Bayer process is eliminated in a kind of alumina producing factory.
Background technology
All there is the problem of organic accumulation and harm in most of Bayer process alumina producers.Organism in the bayer liquors is mainly from bauxite; Additives such as flocculation agent, skimmer, dewatering agent also can be brought a small amount of organism into; Because aluminum hydroxide wash liquor can get into the primary wash liquor of red mud, thereby get into seed precipitation solution, and seed precipitation solution is a round-robin; Add that red mud backwater and various sewage get into 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, the impurity in the increase product is Na particularly
2Produce significant foam 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.Through to the organic mensuration of alumina producer, the organism that on thin aluminium hydroxide crystal seed, adheres to is higher, and organic content is higher in the aluminum hydroxide wash liquor simultaneously.
Summary of the invention
The technical problem that the present invention will solve is: the method that provides a kind of organic matter by Bayer process to eliminate; This method can effectively be eliminated the organic content in the bayer liquors; Reduce the disadvantageous effect that organism causes production, and to the influence of product aluminum oxide quality, to overcome reduction decomposition rate and the aluminum oxide output capacity that prior art exists; Make hydroxide particle-size attenuate, frangible, increase the deficiencies such as impurity in the product.
The present invention is achieved in that it comprises two sections decomposition coursees, and first section is washed thin aluminium hydroxide crystal seed with aluminum hydroxide wash liquor, uses hot wash for second section, and second section washing lotion is added milk of lime and carried out causticization after with liquid caustic soda caustic ratio being improved.
First section thin aluminium hydroxide crystal seed filters the aluminum hydroxide wash liquor obtain as first section washing with finished product white lake, lets organism in the aluminum hydroxide wash liquor as much as possible attached on the crystal seed, and the washing lotion that obtains is sent mother liquid evaporation.
Thin aluminium hydroxide crystal seed reusable heat water through first section washing carries out second section washing, and the crystal seed after the washing goes to decompose.
Add liquid base in the washing lotion through second section washing, with the caustic ratio α of solution
kBe increased to more than 6; Control solution temperature at 60 ~ 70 ℃, and then add milk of lime, carry out causticizing reaction according to organic amount; Generate caoxalate; Caoxalate is through the subsider solid-liquid separation, and isolated causticization slag send red-mud settlement to separate and washing or send and store up, and the causticization slag can be taken away in the aluminum hydroxide wash liquor about 40% organism; 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 40% 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 process flow sheet of the present invention.
Embodiment
Embodiments of the invention: it comprises two sections decomposition coursees, and first section thin aluminium hydroxide crystal seed filters the aluminum hydroxide wash liquor obtain as first section washing with finished product white lake; Let organism in the aluminum hydroxide wash liquor as much as possible attached on the crystal seed; The washing lotion that obtains is sent evaporation, and crystal seed reusable heat water carries out second section washing, and the crystal seed after the washing goes to decompose; Washing lotion adds liquid base, 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 60～70 ℃, and then carries out causticizing reaction by the molecular ratio 1-5 of contained sodium oxalate and yellow soda ash and milk of lime in the solution, the causticizing reaction time was controlled at 2 hours, reacted the generation caoxalate, reaction formula: Na
2C
2O
4+ CaO → CaC
2O
4+ Na
2O.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 to separate and washing or send and store up, and the causticization slag can be taken away in the aluminum hydroxide wash liquor about 40% organism; Alkali lye after the separation goes ashing or evaporation.
Claims (1)
1. the method eliminated of an organic matter by Bayer process; It is characterized in that: it comprises two sections decomposition coursees, and first section is washed thin aluminium hydroxide crystal seed with aluminum hydroxide wash liquor, uses hot wash for second section; Second section washing lotion is added milk of lime and is carried out causticization after with liquid caustic soda caustic ratio being improved; First section thin aluminium hydroxide crystal seed; Filter the aluminum hydroxide wash liquor obtain as first section washing with finished product white lake, let organism in the aluminum hydroxide wash liquor as much as possible attached on the crystal seed, the washing lotion that obtains is sent mother liquid evaporation; Thin aluminium hydroxide crystal seed reusable heat water through first section washing carries out second section washing; Crystal seed after the washing goes to decompose, and adds liquid base in the washing lotion through second section washing, with the caustic ratio α of solution
kBe increased to more than 6; Control solution temperature at 60～70 ℃, and then add milk of lime, carry out causticizing reaction according to organic amount; Generate caoxalate; Caoxalate is through the subsider solid-liquid separation, and isolated causticization slag send red-mud settlement separation and washing or send and store up, and the 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, the causticizing reaction time is 2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103113782A CN101734696B (en) | 2009-12-14 | 2009-12-14 | Method for removing organic matter by Bayer process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103113782A CN101734696B (en) | 2009-12-14 | 2009-12-14 | Method for removing organic matter by Bayer process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101734696A CN101734696A (en) | 2010-06-16 |
| CN101734696B true CN101734696B (en) | 2012-04-25 |
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ID=42458810
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103113782A Expired - Fee Related CN101734696B (en) | 2009-12-14 | 2009-12-14 | Method for removing organic matter by Bayer process |
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| CN (1) | CN101734696B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106564920B (en) * | 2016-11-07 | 2019-03-08 | 中国铝业股份有限公司 | A method of improving Bayer process corrosion |
| CN111892073A (en) * | 2020-07-09 | 2020-11-06 | 中铝中州铝业有限公司 | Method for removing organic matters in seed precipitation mother liquor by Bayer process |
| CN111807394B (en) * | 2020-07-24 | 2022-10-28 | 沈阳工业大学 | Method for removing organic matters from Bayer process mother liquor |
| CN114920273B (en) * | 2022-07-06 | 2023-09-26 | 山东南山铝业股份有限公司 | Method for removing high molecular weight organic matters in sodium aluminate solution |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4335082A (en) * | 1979-10-30 | 1982-06-15 | Magyar Aluminiumipari Troszt | Method of decreasing the organic substance content of alum earth production cycle performed according to the Bayer technology |
| CN1344228A (en) * | 1999-03-19 | 2002-04-10 | 沃斯利矾士控股有限公司 | Process for removal of oxalate and/or sulphate from bayer liquors |
| CN201296674Y (en) * | 2008-12-03 | 2009-08-26 | 沈阳铝镁设计研究院 | Oxalate eliminating system for sodium aluminate solution |
-
2009
- 2009-12-14 CN CN2009103113782A patent/CN101734696B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4335082A (en) * | 1979-10-30 | 1982-06-15 | Magyar Aluminiumipari Troszt | Method of decreasing the organic substance content of alum earth production cycle performed according to the Bayer technology |
| CN1344228A (en) * | 1999-03-19 | 2002-04-10 | 沃斯利矾士控股有限公司 | Process for removal of oxalate and/or sulphate from bayer liquors |
| CN201296674Y (en) * | 2008-12-03 | 2009-08-26 | 沈阳铝镁设计研究院 | Oxalate eliminating system for sodium aluminate solution |
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| CN101734696A (en) | 2010-06-16 |
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