CN103848446A - Side stream causticization method and apparatus of Bayer process alumina production - Google Patents
Side stream causticization method and apparatus of Bayer process alumina production Download PDFInfo
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- CN103848446A CN103848446A CN201210496063.1A CN201210496063A CN103848446A CN 103848446 A CN103848446 A CN 103848446A CN 201210496063 A CN201210496063 A CN 201210496063A CN 103848446 A CN103848446 A CN 103848446A
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Abstract
The invention discloses a side stream causticization method and an apparatus of Bayer process alumina production. According to the side stream causticization method, the causticization raw solution is a secondary or tertiary washing solution from a red mud separation washing step, and the side stream causticization method is adopted to replace the evaporation salt-emission process. According to the present invention, the side stream causticization method can replace the evaporation salt-emission process at the early stage of factory construction, has characteristics of simple process, investment reduction, easy operation and energy consumption reduction, and is especially for Bayer process alumina plants adopting gibbsite as the raw material.
Description
Technical field
The invention belongs to technical field of alumina production, relate generally to a kind of sodium carbonate causticization method and apparatus, be particularly useful for gibbsite and produce aluminum oxide method.
Background technology
In aluminum oxide production process, sodium carbonate causticization operation is indispensable operation, if because the sodium carbonate of accumulation can not be discharged in time in process of production, can be on the hot face of digester and vaporizer crystallization, form fouling, thereby reduction heat transfer efficiency, increases energy consumption.And after 30g/L was grasped in sodium carbonate accumulation, also can there is certain influence to decomposition rate.
In view of above unfavorable factor, in current Bayer process alumina producer at home, all increase causticization salt discharge operation in mother liquid evaporation workshop, this process flow complexity, energy consumption is high.
Summary of the invention
The present invention is exactly a kind of lateral flow causticization method and the device providing in order to solve above-mentioned techno-economic question, its objective is the causticization that realizes sodium carbonate, and simple flow, reduces energy consumption, reduces investment.At the initial stage of founding the factory, as adopt lateral flow causticization flow process, and can cancel evaporation salt discharge process by red-mud settlement and separation washing subitem secondary or three washing lotions as the causticization method of causticization stoste, flow process is simple, reduce energy consumption, be particularly useful for the Bayer process alumina producer take gibbsite as raw material.
For reaching above-mentioned purpose, the present invention is achieved in that
A lateral flow causticization method for Bayer process alumina producing, the causticization stoste of described lateral flow causticization method is secondary or three washing lotions that red mud separating, washing operation is come; Described lateral flow causticization method is used for substituting evaporation salt discharge process.
Present method is particularly useful for the Bayer process alumina producing take gibbsite as raw material.
Concrete technology of the present invention is as follows: the secondary that red mud separating, washing operation is come or three washing lotions enter the first groove of causticizing tank as causticization stoste, in the first groove of causticizing tank, add milk of lime, to causticizing tank carry barrel pass into pressurized air carry material make causticization solution enter subordinate's causticizing tank, in causticizing tank, stop at least 2 hours and uniform stirring in addition, solution after causticization enters subsider and carries out solid-liquid separation, subsider overflow is that after causticization, liquid pump is got to red mud separating, washing operation once or secondary washing subsider, subsider underflow is that causticization slag pump is got to red mud separating, washing operation three times, four times or last washing settling groove, in causticization process, each causticizing tank and subsider all pass into live steam insulation.
Described live steam pressure is 0.6MPa, and temperature is 158 ℃, to guarantee that causticizing tank temperature remains on 95～98 ℃.
The amount of described milk of lime should be calculated milk of lime amount with molecular ratio [Ca]/[Nc]=1.2.
Another kind of concrete technology of the present invention is as follows: secondary or three washing lotions that red mud separating, washing operation is come enter each causticizing tank as causticization stoste simultaneously, in each causticizing tank, add milk of lime, carrying barrel to causticizing tank passes into pressurized air and carries material and make causticization solution enter subsider to carry out solid-liquid separation, in causticizing tank, stop at least 2 hours and uniform stirring in addition, subsider overflow is that after causticization, liquid pump is got to red mud separating, washing operation once or secondary washing subsider, subsider underflow is that causticization slag pump is got to red mud separating, washing operation three times, four times or last washing settling groove, in causticization process, each causticizing tank and subsider all pass into live steam insulation.Described live steam pressure is 0.6MPa, and temperature is 158 ℃, to guarantee that causticizing tank temperature remains on 95～98 ℃.
The amount of described milk of lime should be calculated milk of lime amount with molecular ratio [Ca]/[Nc]=1.2.
The invention also discloses the device of realizing described method, comprise causticizing tank, subsider; Described causticizing tank access causticization stoste, milk of lime, pressurized air, described causticizing tank, subsider all access live steam; Described subsider arranges liquid pump, causticization pulp pump, and described liquid pump is for getting to subsider overflow red-mud settlement and separation washing subitem once or secondary washing groove; Described causticization pulp pump is for getting to subsider underflow red-mud settlement and separation washing subitem three times, four times or last rinse bath.
Described causticizing tank is two groups, is respectively the first groove of causticizing tank and secondary causticizing tank, the first groove access of described causticizing tank causticization stoste; Subsider is two groups; The public liquid pump of described two groups of subsiders; The public causticization pulp pump of described two groups of subsiders.
Another device of realizing the inventive method, described causticizing tank is one group, described causticizing tank all accesses causticization stoste; Subsider is two groups; The public causticization pulp pump of described two groups of subsiders.
Described causticizing tank is the flat pan that band stirred and carried barrel.
Advantage of the present invention and effect are: above technical scheme can solve the problem of sodium carbonate accumulation in production process, and simple flow reduces energy consumption, reduces investment and working cost.
Accompanying drawing explanation
Fig. 1 is the present invention's schematic flow sheet of causticization method and device step by step;
Fig. 2 is the schematic flow sheet of the present invention's while causticization method and device.
In accompanying drawing: 1, the first groove of causticizing tank; 2, subsider; 3, liquid pump after causticization; 4, causticization pulp pump; 5, pressurized air; 6, live steam; 7, causticization stoste; 8, milk of lime; 9, solution after causticization; 10, subsider overflow; 11, subsider underflow; 12, causticization solution; 102, secondary causticizing tank; 103, causticizing tank.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail, but protection scope of the present invention is not limit by embodiment.The technology of the present invention is not only applicable to the causticization of red mud secondary or three washing lotions, is applicable to the causticization of similar solution simultaneously yet.Simultaneously, causticizing tank of the present invention and subsider are not limited only to the disclosed several forms of embodiment, as causticizing tank and subsider all can arrange multiple, and according to different mode of connection to causticization stoste carry out step by step causticization or simultaneously causticization and step by step causticization combine with while causticization.
Embodiment 1
The present embodiment is causticization step by step, as shown in Figure 1, the secondary that red mud separating, washing operation is come or three washing lotions enter the first groove 1 of causticizing tank as causticization stoste 7, in the first groove 1 of causticizing tank, add milk of lime 8, carrying barrel to causticizing tank passes into pressurized air 5 and makes causticization solution 12 enter secondary causticizing tank 102, in secondary causticizing tank, stop at least 2 hours and uniform stirring in addition, after causticization, solution 9 enters subsider 2 and carries out solid-liquid separation, subsider overflow 10 is that after causticization, liquid liquid pump after causticization 3 is got to red mud separating, washing operation once or secondary washing subsider, subsider underflow 11 is that causticization slag causticization pulp pump 4 is got to red mud separating, washing operation three times, four times or last washing settling groove, in causticization process, each causticizing tank and subsider all pass into live steam 6 and are incubated.
Described live steam 6 pressure are 0.6MPa, and temperature is 158 ℃, to guarantee that causticization Process liquor temperature remains on 95～98 ℃.
The amount of described milk of lime should be calculated milk of lime amount with molecular ratio [Ca]/[Nc]=1.2.
The inventive system comprises causticizing tank, subsider; Described causticizing tank comprises the first groove 1 of causticizing tank and secondary causticizing tank 102, and the first groove 1 of described causticizing tank accesses causticization stoste 7, milk of lime 8, pressurized air 5, and described secondary causticizing tank 102, subsider 2 all access live steam 6; Described subsider 2 arranges liquid pump 3 after causticization, causticization pulp pump 4, and after described causticization, liquid pump 3 is for getting to subsider overflow red-mud settlement and separation washing subitem once or secondary washing groove; Described causticization pulp pump 4 is for getting to subsider underflow red-mud settlement and separation washing subitem three times, four times or last rinse bath.Subsider 2 is two groups; Liquid pump 3 after the public causticization of described two groups of subsiders; The public causticization pulp pump 4 of described two groups of subsiders 2.Described causticizing tank is the flat pan that band stirred and carried barrel.
The present embodiment is while causticization
As shown in Figure 2, the difference of the present embodiment and embodiment 1 is that secondary or three washing lotions that red mud separating, washing operation is come enter each causticizing tank 103 as causticization stoste 7 and milk of lime 8 simultaneously, and other are identical with embodiment 1.
Claims (14)
1. a lateral flow causticization method for Bayer process alumina producing, is characterized in that; The causticization stoste of described lateral flow causticization method is secondary or three washing lotions that red mud separating, washing operation is come; Described lateral flow causticization method is used for substituting evaporation salt discharge process.
2. method according to claim 1, is characterized in that: for the Bayer process alumina producing take gibbsite as raw material.
3. method according to claim 1, it is characterized in that concrete technology is as follows: the secondary that red mud separating, washing operation is come or three washing lotions enter the first groove of causticizing tank as causticization stoste, in the first groove of causticizing tank, add milk of lime, to causticizing tank carry barrel pass into pressurized air carry material make causticization solution enter subordinate's causticizing tank, in causticizing tank, stop at least 2 hours and uniform stirring in addition, solution after causticization enters subsider and carries out solid-liquid separation, subsider overflow is that after causticization, liquid pump is got to red mud separating, washing operation once or secondary washing subsider, subsider underflow is that causticization slag pump is got to red mud separating, washing operation three times, four times or last washing settling groove, in causticization process, each causticizing tank and subsider all pass into live steam insulation.
4. method according to claim 3, is characterized in that: described live steam pressure is 0.6MPa, and temperature is 158 ℃, to guarantee that causticizing tank temperature remains on 95～98 ℃.
5. method according to claim 3, is characterized in that: the amount of described milk of lime should be calculated milk of lime amount with molecular ratio [Ca]/[Nc]=1.2.
6. method according to claim 1, it is characterized in that concrete technology is as follows: secondary or three washing lotions that red mud separating, washing operation is come enter each causticizing tank as causticization stoste simultaneously, in each causticizing tank, add milk of lime, carrying barrel to causticizing tank passes into pressurized air and carries material and make causticization solution enter subsider to carry out solid-liquid separation, in causticizing tank, stop at least 2 hours and uniform stirring in addition, subsider overflow is that after causticization, liquid pump is got to red mud separating, washing operation once or secondary washing subsider, subsider underflow is that causticization slag pump is got to red mud separating, washing operation three times, four times or last washing settling groove, in causticization process, each causticizing tank and subsider all pass into live steam insulation.
7. method according to claim 6, is characterized in that: described live steam pressure is 0.6MPa, and temperature is 158 ℃, to guarantee that causticizing tank temperature remains on 95～98 ℃.
8. method according to claim 6, is characterized in that: the amount of described milk of lime should be calculated milk of lime amount with molecular ratio [Ca]/[Nc]=1.2.
9. a device of realizing method described in claim 1, is characterized in that: comprise causticizing tank, subsider; Described causticizing tank access causticization stoste, milk of lime, pressurized air, described causticizing tank, subsider all access live steam; Described subsider arranges liquid pump, causticization pulp pump, and after described causticization, liquid pump is for getting to subsider overflow red-mud settlement and separation washing subitem once or secondary washing groove; Described causticization pulp pump is for getting to subsider underflow red-mud settlement and separation washing subitem three times, four times or last rinse bath.
10. device according to claim 9, is characterized in that: described causticizing tank is two groups, is respectively the first groove of causticizing tank and secondary causticizing tank, the first groove access of described causticizing tank causticization stoste, or causticizing tank is one group, the each groove access of described causticizing tank causticization stoste.
11. devices according to claim 9, is characterized in that: subsider is two groups.
12. devices according to claim 9, is characterized in that: the public liquid pump of described two groups of subsiders.
13. devices according to claim 9, is characterized in that: the public causticization pulp pump of described two groups of subsiders.
14. according to the arbitrary device described in claim 9-13, it is characterized in that: described causticizing tank is the flat pan that band stirred and carried barrel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210496063.1A CN103848446B (en) | 2012-11-28 | 2012-11-28 | A kind of lateral flow causticization method of Bayer process alumina producing and device |
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| CN201210496063.1A CN103848446B (en) | 2012-11-28 | 2012-11-28 | A kind of lateral flow causticization method of Bayer process alumina producing and device |
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| CN103848446B CN103848446B (en) | 2016-04-27 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1810647A (en) * | 2006-02-22 | 2006-08-02 | 沈阳铝镁设计研究院 | Causticization process in alumina producing Bayer process |
| CN1868880A (en) * | 2005-05-25 | 2006-11-29 | 贵阳铝镁设计研究院 | Lateral flow causticization process method and device |
| CN201109719Y (en) * | 2007-09-20 | 2008-09-03 | 沈阳铝镁设计研究院 | Salt-discharging causticization system for producing aluminum oxide by Bayer process |
| CN101372347A (en) * | 2007-08-23 | 2009-02-25 | 沈阳铝镁设计研究院 | Salt drainage and caustification process as well as caustification system for aluminum oxide production by Bayer process |
| CN101734697A (en) * | 2009-12-14 | 2010-06-16 | 中铝国际技术发展有限公司 | Method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor |
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2012
- 2012-11-28 CN CN201210496063.1A patent/CN103848446B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1868880A (en) * | 2005-05-25 | 2006-11-29 | 贵阳铝镁设计研究院 | Lateral flow causticization process method and device |
| CN1810647A (en) * | 2006-02-22 | 2006-08-02 | 沈阳铝镁设计研究院 | Causticization process in alumina producing Bayer process |
| CN101372347A (en) * | 2007-08-23 | 2009-02-25 | 沈阳铝镁设计研究院 | Salt drainage and caustification process as well as caustification system for aluminum oxide production by Bayer process |
| CN201109719Y (en) * | 2007-09-20 | 2008-09-03 | 沈阳铝镁设计研究院 | Salt-discharging causticization system for producing aluminum oxide by Bayer process |
| CN101734697A (en) * | 2009-12-14 | 2010-06-16 | 中铝国际技术发展有限公司 | Method for causticizing and eliminating organics by adding lime milk in aluminum hydroxide wash liquor |
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