CN103130257A - Improved aluminum oxide production method - Google Patents
Improved aluminum oxide production method Download PDFInfo
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- CN103130257A CN103130257A CN2013100847225A CN201310084722A CN103130257A CN 103130257 A CN103130257 A CN 103130257A CN 2013100847225 A CN2013100847225 A CN 2013100847225A CN 201310084722 A CN201310084722 A CN 201310084722A CN 103130257 A CN103130257 A CN 103130257A
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- aluminum oxide
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- solid
- bayer process
- leaching
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Abstract
The invention provides an improved aluminum oxide production method, and relates to improvement of a process for producing aluminum oxide from bauxite. The production process comprises a process of producing aluminum oxide from bauxite through a Bayer process, and is characterized by comprising the following steps: (1) adding lime, sodium carbonate and silica slag into Bayer process red mud or a mixture of Bayer process red mud and bauxite, thus obtaining a green material; (2) firing the green material to obtain clinker; (3) performing alkali leaching on the clinker, and then performing liquid-solid separation to obtain a solid-phase residue 1 and a leach solution 1; (4) mixing the leach solution 1 and Bayer process digested slurry to perform desilication, and performing liquid-solid separation; (5) performing Bayer process crystal seed decomposition on the refined solution which is subjected to liquid-solid separation in the step (4); and (6) further performing alkali leaching on the solid-phase residue 1 obtained in the step (3). The method provided by the invention has the characteristics of low consumption and high aluminum oxide recovery rate; and the solid-phase residue can be directly used for producing cement or construction materials.
Description
Technical field
A kind of method of improved production aluminum oxide relates to a kind of improvement of adopting bauxite into alumina technique.
Background technology
Due to alumina producing scale Rapid Expansion in recent years, China's bauxite resource amount and grade sharply descend.Ore A/S and alumina content be decrease also, adopts the Bayer process process for making alumina, and the alumina recovery rate is low, and alkaline consumption is high.In order to fully utilize low-grade bauxite and to reclaim aluminum oxide and alkali in Bayer process red mud, industrial production adopts the techniques such as integrated process (as mixed combining method or series process), but Wingdale and energy consumption are larger.How reducing energy consumption and the consumption of limestone of sintering process part in integrated process, is the improved direction of integrated process Technology.Therefore, be necessary to develop the alumina recovery rate higher, and lime and the lower innovative technology of energy consumption.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists for prior art, provides a kind of technical process short, and consumption of limestone and energy consumption are lower, the red mud residue can be directly used in the method for the improved production aluminum oxide of producing cement and other raw material of building materials.
The objective of the invention is to be achieved through the following technical solutions.
A kind of method of improved production aluminum oxide, the step of its production process comprise that bauxite adopts bayer process to produce alumina process; The step that it is characterized in that its process also comprises:
(1) with adding lime, soda ash sodium carbonate and white residue in Bayer process red mud or Bayer process red mud and bauxite mixture, make raw material;
(2) raw material are fired into grog;
(3) grog is carried out alkali and leach, carry out liquid-solid separation after leaching, obtain solid phase residue 1 and leach liquor 1;
(4) with leach liquor 1 and Bayer Process digestion slip mixing desiliconization, carry out liquid-solid separation;
(5) with the seminal fluid that obtains after the liquid-solid separation of step (4), carry out the Bayer process decomposition of crystal seed and obtain aluminium hydroxide.
The method of the production aluminum oxide of a modification of the present invention is characterized in that the step of its process also comprises:
(6) the isolated solid phase of step (4) is returned to step (1);
(7) the solid phase residue 1 that step (3) is obtained carries out alkali again and leaches;
(8) step (7) is leached rear slurry and carry out solid-liquid separation, obtain leach liquor 2 and residue 2; Residue 2 is for the production of the raw material of material of construction.
The method of the production aluminum oxide of a modification of the present invention is characterized in that described leach liquor 2 adds lime and carries out dealuminzation, and through solid-liquid separation, isolated solid phase is returned to the Bayer process process as leaching additive; After dealuminzation after separation, liquid returns to step (7) and carries out the leaching of residue 1.
The method of the production aluminum oxide of a modification of the present invention is characterized in that described leach liquor 2 adds lime and carries out dealuminzation, and liquid is incorporated the Bayer process vaporizing raw liquor into after the dealuminzation after solid-liquid separation.
The method of the production aluminum oxide of a modification of the present invention is characterized in that described leach liquor 2 adds lime and carries out dealuminzation, and liquid is used for the adjustment of step (4) leach liquor 1 caustic ratio after the dealuminzation after solid-liquid separation.
The method of the production aluminum oxide of a modification of the present invention is characterized in that described step (1) makes the raw material process, and the addition of lime is by SiO in system
2Amount determine, addition is according to CaO and SiO
2Mol ratio be 0.8～2.0, soda ash sodium carbonate add-on is according to Na
2O and Al
2O
3+ Fe
2O
3Mol ratio be 0.9～3 to control.
The method of the production aluminum oxide of a modification of the present invention is characterized in that described step (2) is 1100～1350 ℃ with the firing temperature that raw material are fired into grog, and the firing time is 20-60 minute.
The method of the production aluminum oxide of a modification of the present invention, what it is characterized in that described step (3) carries out the alkali leaching process with grog, be to leach under the condition of 70～110 ℃ of temperature, the leach liquor concentration of sodium carbonate that carries out the alkali leaching is controlled to be Nc 5～25g/l.
The method of the production aluminum oxide of a modification of the present invention can be used for processing the different places of production, different chemical forms and the bauxite of mineral composition, and in solid residue, alkali content is low, can be directly as the raw material of material of construction.Technology maturation of the present invention is reliable, compares with existing process for making alumina, and mass flow is little, and the solid phase level of residue is few, and can realize the zero release of whole process, is conducive to environment protection.
The method of the production aluminum oxide of a modification of the present invention has the advantages that mass flow is little, energy consumption is low, Wingdale (or lime) consumption is low, alkaline consumption is low, the alumina recovery rate is high, and its solid phase residue can be directly used in produces cement or material of construction.
Embodiment
A kind of method of improved production aluminum oxide, the step of its production process comprises:
⑴Bauxite adopts bayer process to produce aluminum oxide;
⑵Add Wingdale or lime in Bayer process red mud or Bayer process red mud and bauxite mixture, and add soda ash, make raw material;
⑶Raw material are fired into grog;
⑷Grog is carried out alkali leach, leaching slurry is carried out liquid-solid separation, obtain solid phase residue 1 and leach liquor 1;
⑸With leach liquor 1 and Bayer Process digestion slip mixing desiliconization, carry out liquid-solid separation;
⑹Bayer process and sintering process mixed semen with liquid-solid separation obtains obtain aluminium hydroxide according to the Bayer process decomposition of crystal seed;
⑺Aluminium hydroxide obtains alumina product after roasting;
⑻The solid phase residue 1 that step 4 is obtained carries out the alkali leaching again, obtains solid phase residue 2 and leach liquor 2, further reclaims aluminum oxide and alkali;
⑼The described leach liquor 2 of step (8) is added the lime dealuminzation, carry out liquid-solid separation, obtain liquid and dealuminzation slag after dealuminzation;
⑽After the dealuminzation that described step (9) obtains, liquid is used for or partly is used for the causticity ratio that step (4) is adjusted leach liquor 1, also can incorporate or partly incorporate into the Bayer process vaporizing raw liquor into;
⑾The dealuminzation slag that described step (9) obtains is used for step (1) Bayer digestion of bauxite stripping batching;
⑿The solid phase residue 2 that step (8) is obtained directly is used as cement or other raw material of building materials.
Embodiment 1
Raw material is certain mining area bauxite, and its Bayer process red mud main chemical compositions is Al
2O
325.51%, SiO
220.51%, with Bayer process red mud and grind rear fineness for the carbonating decomposition nut liquid after-80 order limestone powders or lime powder and sodium carbonate and evaporation according to CaO and SiO
2Mol ratio be 0.8 to control, the light ash addition is according to Na
2O and Al
2O
3+ Fe
2O
3Mol ratio be 1.6 to control batching preparation raw material; Be to fire under 1200 ℃ of conditions charge pulp in temperature, obtain qualified grog; Leach grog with adjusting liquid under the condition of 80-90 ℃, in grog, leaching rate of alumina is 83%, and in grog, the sodium oxide leaching yield is 80%.Clinker leaching liquor is planted to divide after collaborating with the Bayer Process digestion slip and is obtained aluminium hydroxide, and aluminium hydroxide obtains the metallurgical-grade aluminum oxide product after roasting.
Solid phase residue caustic sodium concentration after the grog stripping is Na
2O
K250g/L, α
k16.5 sodium aluminate solution liquid be under 170 ℃ of conditions in temperature, leached 10 minutes, leaching liquid-solid ratio is 7.After liquid-solid separation, liquid phase is incorporated clinker leaching liquor warp and Bayer Process digestion slip into; Al in the solid phase residue
2O
3Leaching yield be 18%, Na in the solid phase residue
2The leaching yield of O is 97%.The solid phase residue that finally obtains is directly as the raw material of producing ordinary Portland cement.
Embodiment 2
Raw material is certain mining area bauxite, and its Bayer process red mud main chemical compositions is Al
2O
325%, SiO
222%, (main chemical compositions is Al for the Bayer process red mud with 65% and 35% low-grade bauxite
2O
353%, SiO
219%) with Wingdale and sodium carbonate and evaporation after the carbonating decomposition nut liquid be-80 purpose ore pulps according to grinding into fineness, CaO and SiO
2Mol ratio be controlled to be 1.0, Na
2O and Al
2O
3+ Fe
2O
3Mol ratio be controlled to be 1.5, be mixed with raw material; Be to fire under 1200 ℃ of conditions charge pulp in temperature, obtain qualified grog; Leach grog with adjusting liquid under the condition of 80-90 ℃, in grog, leaching rate of alumina is 83%, and in grog, the sodium oxide leaching yield is 81%.Clinker leaching liquor is planted to divide after collaborating with the Bayer Process digestion slip and is obtained aluminium hydroxide, and aluminium hydroxide obtains the metallurgical-grade aluminum oxide product after roasting.
Solid phase residue caustic sodium concentration after the grog stripping is Na
2O
KThe alkaline solution of 110g/L is under 95 ℃ of conditions in temperature, leaches 240 minutes, and leaching liquid-solid ratio is 3.After liquid-solid separation, a liquid phase part is incorporated clinker leaching liquor warp and Bayer Process digestion slip into, and rest part is incorporated the Bayer process vaporizing raw liquor into; Al in the solid phase residue
2O
3Leaching yield be 18%, Na in the solid phase residue
2The leaching yield of O is 97%.The solid phase residue that finally obtains is directly as the raw material of producing ordinary Portland cement.
Embodiment 3
Raw material is certain mining area bauxite, and its Bayer process red mud main chemical compositions is Al
2O
325%, SiO
222%, the Bayer process red mud with 65% and 35% (main chemical compositions is Al than low-grade bauxite
2O
353%, SiO
219%), the carbonating decomposition nut liquid after Wingdale and sodium carbonate and evaporation is-80 purpose ore pulps according to grinding into fineness, CaO and SiO
2Mol ratio control according to 1.25, Na
2O and Al
2O
3+ Fe
2O
3Mol ratio control according to 1.0, be mixed with raw material; Be to fire under 1220 ℃ of conditions charge pulp in temperature, obtain qualified grog; Leach grog with adjusting liquid under the condition of 80-90 ℃, in grog, leaching rate of alumina is 84%, and in grog, the sodium oxide leaching yield is 82%.Clinker leaching liquor is planted to divide after collaborating with the Bayer Process digestion slip and is obtained aluminium hydroxide, and aluminium hydroxide obtains the metallurgical-grade aluminum oxide product after roasting.
Solid phase residue caustic sodium concentration after the grog stripping is Na
2O
K180g/L, α
k10.5 sodium aluminate solution liquid be under 170 ℃ of conditions in temperature, leached 20 minutes, leaching liquid-solid ratio is 7.After liquid-solid separation, a liquid phase part is incorporated clinker leaching liquor warp and Bayer Process digestion slip into, and rest part is incorporated the Bayer process vaporizing raw liquor into; Al in the solid phase residue
2O
3Leaching yield be 20%, Na in the solid phase residue
2The leaching yield of O is 98%.The solid phase residue that finally obtains is directly as the raw material of producing ordinary Portland cement.
Embodiment 4
Raw material is certain mining area bauxite, and its Bayer process red mud main chemical compositions is Al
2O
325%, SiO
222%, the Bayer process red mud with 65% and 35% (main chemical compositions is Al than low-grade bauxite
2O
353%, SiO
219%), the carbonating decomposition nut liquid after Wingdale and sodium carbonate and evaporation is-80 purpose ore pulps according to grinding into fineness, CaO and SiO
2Mol ratio control according to 1.16, Na
2O and Al
2O
3+ Fe
2O
3Mol ratio control according to 2.0, be mixed with raw material; Be to fire under 1240 ℃ of conditions charge pulp in temperature, obtain qualified grog; Leach grog with adjusting liquid under the condition of 80-90 ℃, in grog, leaching rate of alumina is 85%, and in grog, the sodium oxide leaching yield is 83%.Clinker leaching liquor is planted to divide after collaborating with the Bayer Process digestion slip and is obtained aluminium hydroxide, and aluminium hydroxide obtains the metallurgical-grade aluminum oxide product after roasting.
Solid phase residue caustic sodium concentration after the grog stripping is Na
2O
K180g/L, α
k10.5 sodium aluminate solution liquid be under 170 ℃ of conditions in temperature, leached 20 minutes, leaching liquid-solid ratio is 7.After liquid-solid separation, a liquid phase part is incorporated clinker leaching liquor warp and Bayer Process digestion slip into, and rest part is incorporated the Bayer process vaporizing raw liquor into; Al in the solid phase residue
2O
3Leaching yield be 17%, Na in the solid phase residue
2The leaching yield of O is 97%.The solid phase residue that finally obtains is directly as the raw material of producing ordinary Portland cement.
Embodiment 5
Raw material is certain mining area bauxite, and its Bayer process red mud main chemical compositions is Al
2O
326%, SiO
223%, the Bayer process red mud with 90% and 10% (main chemical compositions is Al than low-grade bauxite
2O
355%, SiO
220%), the carbonating decomposition nut liquid after lime and sodium carbonate and evaporation is-80 purpose ore pulps according to grinding into fineness, CaO and SiO
2Mol ratio control according to 0.95, Na
2O and Al
2O
3+ Fe
2O
3Mol ratio control according to 1.01, be mixed with raw material; Be to fire under 1230 ℃ of conditions charge pulp in temperature, obtain qualified grog; Leach grog with adjusting liquid under the condition of 80-90 ℃, in grog, leaching rate of alumina can reach 82%, and in grog, the sodium oxide leaching yield can reach 80%.Clinker leaching liquor is planted to divide after collaborating with the Bayer Process digestion slip and is obtained aluminium hydroxide, and aluminium hydroxide obtains the metallurgical-grade aluminum oxide product after roasting.
Solid phase residue caustic sodium concentration after the grog stripping is Na
2O
K150g/L, α
k16.5 sodium aluminate solution liquid be under 95 ℃ of conditions in temperature, leached 120 minutes, leaching liquid-solid ratio is 5.After liquid-solid separation, a liquid phase part is incorporated clinker leaching liquor warp and Bayer Process digestion slip into, and rest part is incorporated the Bayer process vaporizing raw liquor into; Al in the solid phase residue
2O
3Leaching yield be 18%, Na in the solid phase residue
2The leaching yield of O is 99%.The solid phase residue that finally obtains is directly as the raw material of producing ordinary Portland cement.
Embodiment 6
Raw material mining area bauxite, its Bayer process red mud main chemical compositions is Al
2O
327%, SiO
221%, the Bayer process red mud with 70% and 30% (main chemical compositions is Al than low-grade bauxite
2O
358%, SiO
221%), the carbonating decomposition nut liquid after Wingdale and sodium carbonate and evaporation is-80 purpose ore pulps according to grinding into fineness, CaO and SiO
2Mol ratio control according to 1.45, Na
2O and Al
2O
3+ Fe
2O
3Mol ratio control according to 1.75, be mixed with raw material; Be to fire under 1220 ℃ of conditions charge pulp in temperature, obtain qualified grog; Leach grog with adjusting liquid under the condition of 80-90 ℃, in grog, leaching rate of alumina is 84%, and in grog, the sodium oxide leaching yield is 82%.Clinker leaching liquor is planted to divide after collaborating with the Bayer Process digestion slip and is obtained aluminium hydroxide, and aluminium hydroxide obtains the metallurgical-grade aluminum oxide product after roasting.
Solid phase residue caustic sodium concentration after the grog stripping is Na
2O
K40g/L, α
k10.5 sodium aluminate solution liquid be under 130 ℃ of conditions in temperature, leached 15 minutes, leaching liquid-solid ratio is 8.After liquid-solid separation, liquid phase is incorporated the Bayer process vaporizing raw liquor into, Al in the solid phase residue
2O
3Leaching yield be 19%, Na in the solid phase residue
2The leaching yield of O is 98%.The solid phase residue that finally obtains is directly as the raw material of producing ordinary Portland cement.
Claims (8)
1. the method for an improved production aluminum oxide, the step of its production process comprise that bauxite adopts bayer process to produce alumina process; The step that it is characterized in that its process also comprises:
(1) with adding lime, soda ash sodium carbonate and white residue in Bayer process red mud or Bayer process red mud and bauxite mixture, make raw material;
(2) raw material are fired into grog;
(3) grog is carried out alkali and leach, carry out liquid-solid separation after leaching, obtain solid phase residue 1 and leach liquor 1;
(4) with leach liquor 1 and Bayer Process digestion slip mixing desiliconization, carry out liquid-solid separation;
(5) with the seminal fluid that obtains after the liquid-solid separation of step (4), carry out the Bayer process decomposition of crystal seed and obtain aluminium hydroxide.
2. the method for a kind of improved production aluminum oxide according to claim 1 is characterized in that the step of its process also comprises:
(6) the isolated solid phase of step (4) is returned to step (1);
(7) the solid phase residue 1 that step (3) is obtained carries out alkali again and leaches;
(8) step (7) is leached rear slurry and carry out solid-liquid separation, obtain leach liquor 2 and residue 2; Residue 2 is for the production of the raw material of material of construction.
3. the method for a kind of improved production aluminum oxide according to claim 1, is characterized in that described leach liquor 2 adds lime and carries out dealuminzation, and through solid-liquid separation, isolated solid phase is returned to the Bayer process process as leaching additive; After dealuminzation after separation, liquid returns to step (7) and carries out the leaching of residue 1.
4. the method for a kind of improved production aluminum oxide according to claim 1, is characterized in that described leach liquor 2 adds lime and carries out dealuminzation, and liquid is incorporated the Bayer process vaporizing raw liquor into after the dealuminzation after solid-liquid separation.
5. the method for a kind of improved production aluminum oxide according to claim 1, is characterized in that described leach liquor 2 adds lime and carries out dealuminzation, and liquid is used for the adjustment of step (4) leach liquor 1 caustic ratio after the dealuminzation after solid-liquid separation.
6. the method for a kind of improved production aluminum oxide according to claim 1 is characterized in that described step (1) makes the raw material process, and the addition of lime is by SiO in system
2Amount determine, addition is according to CaO and SiO
2Mol ratio be 0.8～2.0, soda ash sodium carbonate add-on is according to Na
2O and Al
2O
3+ Fe
2O
3Mol ratio be 0.9～3 to control.
7. the method for a kind of improved production aluminum oxide according to claim 1, is characterized in that described step (2) is 1100～1350 ℃ with the firing temperature that raw material are fired into grog, and the firing time is 20-60 minute.
8. the method for a kind of improved production aluminum oxide according to claim 1, what it is characterized in that described step (3) carries out the alkali leaching process with grog, be to leach under the condition of 70～110 ℃ of temperature, the leach liquor concentration of sodium carbonate that carries out the alkali leaching is controlled to be Nc 5～25g/l.
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| CN2013100847225A CN103130257A (en) | 2013-03-18 | 2013-03-18 | Improved aluminum oxide production method |
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|---|---|---|---|
| CN2013100847225A CN103130257A (en) | 2013-03-18 | 2013-03-18 | Improved aluminum oxide production method |
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ID=48490778
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108083294A (en) * | 2018-02-12 | 2018-05-29 | 沈阳鑫博工业技术股份有限公司 | A kind of device and method that aluminium oxide and sodium oxide molybdena are extracted from red mud |
| CN112850793A (en) * | 2021-02-11 | 2021-05-28 | 贵州大学 | High-value utilization method of red mud |
| CN113166847A (en) * | 2018-11-26 | 2021-07-23 | 诺尔斯海德公司 | Method and system for producing alumina from bauxite ore |
| CN113860343A (en) * | 2021-09-27 | 2021-12-31 | 北京润捷浩达科技有限公司 | Comprehensive utilization method of red mud and bauxite |
| CN114988443A (en) * | 2022-06-02 | 2022-09-02 | 中南大学 | Method for recovering aluminum oxide from aluminum-rich slag |
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| CN101070172A (en) * | 2007-05-31 | 2007-11-14 | 中国铝业股份有限公司 | Improved series method for producing aluminium oxide |
| CN101117230A (en) * | 2007-07-12 | 2008-02-06 | 中国铝业股份有限公司 | Bayer process dissolving-out method |
| CN102225778A (en) * | 2011-01-06 | 2011-10-26 | 内蒙古大唐国际再生资源开发有限公司 | Method for production of alumina, joint product of cement and joint product of 4A zeolite molecular sieve with high aluminum fly ash |
| CN102627305A (en) * | 2012-03-28 | 2012-08-08 | 中国铝业股份有限公司 | Method using alkaline process to extract alumina in coal ash |
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| CN101070172A (en) * | 2007-05-31 | 2007-11-14 | 中国铝业股份有限公司 | Improved series method for producing aluminium oxide |
| CN101117230A (en) * | 2007-07-12 | 2008-02-06 | 中国铝业股份有限公司 | Bayer process dissolving-out method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108083294A (en) * | 2018-02-12 | 2018-05-29 | 沈阳鑫博工业技术股份有限公司 | A kind of device and method that aluminium oxide and sodium oxide molybdena are extracted from red mud |
| CN113166847A (en) * | 2018-11-26 | 2021-07-23 | 诺尔斯海德公司 | Method and system for producing alumina from bauxite ore |
| CN113166847B (en) * | 2018-11-26 | 2022-11-08 | 诺尔斯海德公司 | Method and system for producing alumina from bauxite ore |
| CN112850793A (en) * | 2021-02-11 | 2021-05-28 | 贵州大学 | High-value utilization method of red mud |
| CN113860343A (en) * | 2021-09-27 | 2021-12-31 | 北京润捷浩达科技有限公司 | Comprehensive utilization method of red mud and bauxite |
| CN114988443A (en) * | 2022-06-02 | 2022-09-02 | 中南大学 | Method for recovering aluminum oxide from aluminum-rich slag |
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Application publication date: 20130605 |