CN1186258C - Alkali-compensating method in process of aluminium oxide - Google Patents
Alkali-compensating method in process of aluminium oxide Download PDFInfo
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- CN1186258C CN1186258C CNB021489289A CN02148928A CN1186258C CN 1186258 C CN1186258 C CN 1186258C CN B021489289 A CNB021489289 A CN B021489289A CN 02148928 A CN02148928 A CN 02148928A CN 1186258 C CN1186258 C CN 1186258C
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- CN
- China
- Prior art keywords
- alkali
- added
- cao
- carbon
- mother liquor
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- Expired - Lifetime
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- 238000000034 method Methods 0.000 title claims abstract description 78
- 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 28
- 239000003513 alkali Substances 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 238000004131 Bayer process Methods 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 28
- 238000005245 sintering Methods 0.000 claims abstract description 28
- 238000001704 evaporation Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 19
- 238000009993 causticizing Methods 0.000 claims description 18
- 230000001502 supplementing effect Effects 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 239000008267 milk Substances 0.000 claims description 3
- 210000004080 milk Anatomy 0.000 claims description 3
- 235000013336 milk Nutrition 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 21
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 18
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 9
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000012452 mother liquor Substances 0.000 description 33
- 238000001556 precipitation Methods 0.000 description 17
- 238000000354 decomposition reaction Methods 0.000 description 15
- 239000011734 sodium Substances 0.000 description 8
- 239000012141 concentrate Substances 0.000 description 6
- 239000013589 supplement Substances 0.000 description 6
- 235000011121 sodium hydroxide Nutrition 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
- 230000008020 evaporation Effects 0.000 description 3
- 229910001388 sodium aluminate Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to an alkali-compensating method in the process of producing aluminium oxide, particularly to a method for compensating lost alkali in the system in the Bayer process in the technological process of producing aluminium oxide with a series parallel connection method. The present invention is characterized in that carbon seed pregnant liquor with a sintering method is added to CaO for causticization reaction at the temperature of 80 to 100 DEG C for 1 to 3 hours, the full alkali concentration of the carbon seed pregnant liquor with the sintering method is from 60 g/l to 150 g/l measured by Na2O, and the added amount of CaO is stoichiometric 50% to 200%. The method of the present invention converts sodium carbonate in the carbon seed pregnant liquor with the sintering method into sodium hydroxide NaOH, and the ingredient of sodium carbonate in solution is the same with seed pregnant liquor after the causticization reaction, and is merged into seed pregnant liquor in the Bayer process for evaporating concentration together, thereby achieving the aim of alkali compensation.
Description
Technical Field
An alkali supplementing method for the technological process of producing alumina relates to a method for supplementing alkali loss of a Bayer process system in the technological process of producing alumina by a mixed combination method.
Background
Currently, in the alkaline production of alumina, NaOH or Na is used2CO3Bauxite is treated to convert the alumina in the ore to sodium aluminate which is soluble in water. Impurities such as iron and titanium in the ore and most of silicon become insoluble compounds, and the insoluble compounds are separated from the solution and washed to be discarded or processed comprehensively. The pure sodium aluminate solution is decomposed to separate out aluminum hydroxide, and an aluminum oxide product can be obtained after separation, washing and calcination. The decomposed mother liquor is recycled to process the next batch of aluminum ore.
The alkaline process for producing alumina has various processes such as Bayer process, sintering process, Bayer-sintering combined process and the like. The combined process has three basic processes, i.e. a parallel process, a series process and a mixed process,according to the chemical components, mineral compositions and other different conditions of bauxite.
In the existing process for producing alumina by a mixed combination method, alkali in a part of systems of a Bayer method is lost due to chemical loss, mechanical loss and the like. This alkali is usually supplemented by incorporating a portion of the sinter process liquor into the bayer process system, with the bayer process liquor being seeded with the pregnant liquor. Because the decomposition rate of the Bayer process refined liquid crystal seeds is only about 50 percent, and the decomposition time is long, usually 60 to 70 hours, about 50 percent of alumina in the system enters the system for circulation, and the utilization rate of energy and equipment is low. In the sintering process fine liquid carbonation decomposition, in order to control the product quality, the decomposition rate is usually controlled to be about 85%, the decomposition time is short, usually only 3-4 hours are needed, and compared with the Bayer process fine liquid seed crystal decomposition, the yield of the alumina under the same flow of the sodium aluminate solution is high.
In the current hybrid process, the Bayer process alkali supplement is completed by directly merging sintering process concentrate into a Bayer process concentrate system. Because the Bayer process seed decomposition rate is low, the alumina output rate of the system is reduced.
Disclosure of Invention
The invention aims to provide an alkali supplementing method for the process of producing alumina, which can effectively improve the yield of alumina, reduce material consumption and improve production efficiency while supplementing alkali aiming at the defects of the alkali supplementing process for producing alumina by the existing mixed combination method.
The purpose of the invention is realized by the following technical scheme.
An alkali supplementing method for the technological process of alumina production features that the mother liquid generated by carbonization of refined liquid obtained by sintering method is used as alkali supplementing liquid and added to Bayer system for evaporation together with the mother liquid obtained by Bayer processThe carbon content mother liquor of sintering method is added after CaO is added for causticization reaction, and the total alkali concentration of the carbon content mother liquor of sintering method is Na260g/l-150g/l calculated by O, 50-200% of the stoichiometric amount of CaO, 80-100 ℃ of the causticization reaction temperature and 1-3 hours of causticization reaction time.
An alkali-supplementing method for the technological process of producing alumina features that the CaO added by causticizing reaction is lime.
An alkali-supplementing method for the technological process of producing alumina features that the CaO added by causticizing reaction is lime milk.
The method of the invention changes most of sodium carbonate in the sintering process carbon precipitation mother liquor into caustic soda NaOH due to the addition of CaO, thereby ensuring that the sodium carbonate component in the solution after causticization reaction is equivalent to the precipitation mother liquor, and after the sodium carbonate component is merged into the Bayer process precipitation mother liquor, the sodium carbonate component is evaporated and concentrated together with the Bayer process precipitation mother liquor for next batch of ore dissolved out by the Bayer process, thereby achieving the purpose of alkali supplement.
Detailed Description
An alkali supplementing method for the technological process of alumina production features that the mother liquid after carbon separation of refined liquid obtained by sintering method is used as alkali supplementing liquid and added to Bayer system for evaporating with the mother liquid obtained by Bayer method, and the carbon mother liquid obtained by sintering method is added after CaO is added for causticizing reaction, and the total alkali concentration of carbon mother liquid obtained by sintering method is Na260g/l-150g/l calculated by O, 50-200% of the stoichiometric amount of CaO, 80-100 ℃ of the causticization reaction temperature and 1-3 hours of causticization reaction time.
Lime or lime milk is added in the causticization reaction. Causticizing is carried out, and chemical reactions of the causticizing include:
solid product 3CaO. Al2O3.8-12H2O is an unstable intermediate, which reacts with the remaining Na in solution2CO3The reaction is as follows:
The process of the present invention is further illustrated below with reference to examples.
Example 1
In the mixed combination method, the total alkali concentration of carbon content mother liquor refined solution is Na2And the content of O is 60g/l, CaO is added into the carbon content mother liquor of the sintering method for causticizing reaction, the content of the added CaO is 30g/l, the causticizing reaction is carried out at the temperature of 100 ℃, after 2 hours of the causticizing reaction, the carbon content mother liquor after causticizing is added into the Bayer process seed precipitation mother liquor, and the carbon content mother liquor is evaporated and concentrated together with the Bayer process seed precipitation mother liquor for dissolving out the next batch of ores by the Bayer process, so that the purpose of alkali supplement is achieved. The carbon decomposition rate of the sintering process concentrate is controlled to be 90%, and the decomposition time is controlled to be 3 hours.
Example 2
In the mixed combination method, the total alkali concentration of the carbon content mother liquor of the sintering method is Na2And O is 150g/l, CaO is added into the carbon content mother liquor of the sintering method for causticizing reaction, the amount of the added CaO is 270g/l, the causticizing reaction is carried out at the temperature of 80 ℃, after the causticizing reaction is carried outfor 3 hours, the carbon content mother liquor after causticizing is added into the Bayer process seed precipitation mother liquor, and the Bayer process seed precipitation mother liquor are subjected to evaporation concentration together to be used for dissolving out the next batch of ores by the Bayer process, so that the purpose of alkali supplement is achieved. The carbon decomposition rate of the sintering process concentrate is controlled to be 85 percent, and the decomposition time is 4 hours.
Example 3
In the mixed combination method, the total alkali concentration of the carbon content mother liquor of the sintering method is Na2And the content of O is 100g/l, CaO is added into the carbon content mother liquor of the sintering method for causticizing reaction, the content of the added CaO is 100g/l, the causticizing reaction is carried out at the temperature of 90 ℃, after the causticizing reaction is carried out for 1 hour, the carbon content mother liquor after causticizing is added into the Bayer process seed precipitation mother liquor, and the carbon content mother liquor and the Bayer process seed precipitation mother liquor are evaporated and concentrated together for dissolving out the next batch of ores by the Bayer process, so that the aim of alkali supplement is fulfilled. The carbon decomposition rate of the sintering process concentrate liquid is controlled to be 86 percent, and the decomposition time is controlled to be 3.5 hours.
Example 4
In the mixed combination method, the total alkali concentration of the carbon content mother liquor of the sintering method is Na2The O is 120g/l, CaO is added into the carbon content mother liquor of the sintering method to carry out causticization reaction, the added CaO amount is 180g/l, and the causticization reaction is carried out at the temperature of 90 DEG CAnd (3) carrying out causticization reaction for 2 hours, adding the causticized carbon seed precipitation mother liquor into Bayer process seed precipitation mother liquor, carrying out evaporation concentration together with the Bayer process seed precipitation mother liquor, and dissolving out the next batch of ores by a Bayer process so as to achieve the purpose of alkali supplement. The carbon decomposition rate of the sintering process concentrate is controlled to be 86%, and the decomposition time is 4 hours.
Claims (3)
1. An alkali supplementing method for the technological process of alumina production features that the mother liquid obtained by carbon separation of refined sintering process liquid is used as alkali supplementing liquid and added to Bayer process system for evaporating with the mother liquid, and the carbon-separated mother liquid obtained by sintering process is added after CaO is added for causticizing reaction, and the total alkali concentration of carbon-separated mother liquid obtained by sintering process is Na260g/l-150g/l calculated by O, 50-200% of the stoichiometric amount of CaO, 80-100 ℃ of the causticization reaction temperature and 1-3 hours of causticization reaction time.
2. The alkali supplementing method for the alumina production process according to claim 1, characterized in that: the CaO added in the causticization reaction is lime.
3. The alkali supplementing method for the alumina production process according to claim 1, characterized in that: CaO added in the causticization reaction is lime milk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021489289A CN1186258C (en) | 2002-11-12 | 2002-11-12 | Alkali-compensating method in process of aluminium oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021489289A CN1186258C (en) | 2002-11-12 | 2002-11-12 | Alkali-compensating method in process of aluminium oxide |
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|---|---|
| CN1405088A CN1405088A (en) | 2003-03-26 |
| CN1186258C true CN1186258C (en) | 2005-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB021489289A Expired - Lifetime CN1186258C (en) | 2002-11-12 | 2002-11-12 | Alkali-compensating method in process of aluminium oxide |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1321064C (en) * | 2005-07-18 | 2007-06-13 | 贵阳铝镁设计研究院 | Bayer process of cauticizing barium salt in mother liquid |
| CN100345759C (en) * | 2005-07-18 | 2007-10-31 | 贵阳铝镁设计研究院 | Method for reducing carbonates in production procedure of aluminum oxide |
| CN100418884C (en) * | 2006-01-16 | 2008-09-17 | 中国铝业股份有限公司 | Process for raising producing aluminium oxide circulating efficiency by Bayer process |
| CN101328693B (en) * | 2007-06-19 | 2010-08-18 | 郭海军 | Clean production method of chemical pulping paper making and aluminum oxide cogeneration |
| CN103101940A (en) * | 2011-11-14 | 2013-05-15 | 沈阳铝镁设计研究院有限公司 | Method for reducing water evaporating volume of system |
| CN102730725A (en) * | 2012-06-21 | 2012-10-17 | 中国铝业股份有限公司 | Method for improving caustic ratio of Barer process seeded precipitation mother solution |
| CN104692433A (en) * | 2013-12-04 | 2015-06-10 | 内蒙古大唐国际再生资源开发有限公司 | Causticizing process for spent carbonated liquor in sintering process production of alumina |
| CN114735739A (en) * | 2022-03-22 | 2022-07-12 | 中铝中州铝业有限公司 | Method for preparing light calcium carbonate by using sintering method carbon content mother liquor |
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2002
- 2002-11-12 CN CNB021489289A patent/CN1186258C/en not_active Expired - Lifetime
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| CN1405088A (en) | 2003-03-26 |
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Granted publication date: 20050126 |