CN103848446B - A kind of lateral flow causticization method of Bayer process alumina producing and device - Google Patents
A kind of lateral flow causticization method of Bayer process alumina producing and device Download PDFInfo
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- CN103848446B CN103848446B CN201210496063.1A CN201210496063A CN103848446B CN 103848446 B CN103848446 B CN 103848446B CN 201210496063 A CN201210496063 A CN 201210496063A CN 103848446 B CN103848446 B CN 103848446B
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Abstract
The present invention discloses a kind of lateral flow causticization method of Bayer process alumina producing, and the causticization stoste of described lateral flow causticization method is secondary or three washing lotions of red mud separating, washing operation; Described lateral flow causticization method is used for substituting evaporation salt discharge process.The present invention can replace evaporation salt discharge process at the initial stage of founding the factory, and flow process is simple, reduces investment, easy to operate, reduces energy consumption, and being particularly useful for take gibbsite as the Bayer process alumina producer of 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 accumulated in process of production can not be discharged in time, then can on the hot face of digester and vaporizer crystallization, form fouling, thus reduction heat transfer efficiency, increase energy consumption.And after 30g/L was grasped in sodium carbonate accumulation, also can have certain influence to decomposition rate.
In view of above unfavorable factor, all increase causticization salt discharge operation in mother liquid evaporation workshop in Bayer process alumina producer at home at present, this process flow is complicated, and energy consumption is high.
Summary of the invention
The present invention is exactly to solve a kind of lateral flow causticization method and device that above-mentioned techno-economic question provides, its objective is the causticization realizing sodium carbonate, and simple flow, reduce energy consumption, reduce investment.At the initial stage of founding the factory, as adopted lateral flow causticization flow process, 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, being particularly useful for take gibbsite as the Bayer process alumina producer of 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 of red mud separating, washing operation; Described lateral flow causticization method is used for substituting evaporation salt discharge process.
Present method is particularly useful for taking gibbsite as the Bayer process alumina producing of raw material.
Concrete technology of the present invention is as follows: the secondary come red mud separating, washing operation or three washing lotions enter the first groove of causticizing tank as causticization stoste, milk of lime is added in the first groove of causticizing tank, carry barrel to causticizing tank to pass into pressurized air and carry material and make causticization solution enter subordinate's causticizing tank, stop in causticizing tank at least 2 hours and in addition uniform stirring, solution after causticization enters subsider and carries out solid-liquid separation, after subsider overflow and causticization, liquid pump gets to red mud separating, washing operation once or secondary washing subsider, subsider underflow and causticization slag pump get to red mud separating, washing operation three times, four times or final wash subsider, 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 DEG C, to ensure that causticizing tank temperature remains on 95 ~ 98 DEG C.
The amount of described milk of lime should calculate milk of lime amount with molecular ratio [Ca]/[Nc]=1.2.
Another kind of concrete technology of the present invention is as follows: the secondary come red mud separating, washing operation or three washing lotions enter each causticizing tank as causticization stoste simultaneously, milk of lime is added in each causticizing tank, carry barrel to causticizing tank to pass into pressurized air and carry material and make causticization solution enter subsider to carry out solid-liquid separation, stop in causticizing tank at least 2 hours and in addition uniform stirring, after subsider overflow and causticization, liquid pump gets to red mud separating, washing operation once or secondary washing subsider, subsider underflow and causticization slag pump get to red mud separating, washing operation three times, four times or final wash subsider, 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 DEG C, to ensure that causticizing tank temperature remains on 95 ~ 98 DEG C.
The amount of described milk of lime should calculate milk of lime amount with molecular ratio [Ca]/[Nc]=1.2.
The invention also discloses the device 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 used for subsider overflow to get to red-mud settlement and separation washing subitem once or secondary washing groove; Described causticization pulp pump is used for subsider underflow being got to red-mud settlement and separation washing subitem three times, four times or final wash groove.
Described causticizing tank is two groups, is respectively the first groove of causticizing tank and secondary causticizing tank, described causticizing tank first groove access 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.
Realize another device of the inventive method, described causticizing tank is one group, and 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 schematic flow sheet of the present invention causticization method and device step by step;
The schematic flow sheet of causticization method and device while that Fig. 2 being the present invention.
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 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 several forms disclosed in 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 with while causticization combine.
Embodiment 1
The present embodiment is causticization step by step, as shown in Figure 1, the secondary come red mud separating, washing operation or three washing lotions enter the first groove 1 of causticizing tank as causticization stoste 7, milk of lime 8 is added in the first groove 1 of causticizing tank, carry barrel to causticizing tank to pass into pressurized air 5 and make causticization solution 12 enter secondary causticizing tank 102, stop in secondary causticizing tank at least 2 hours and in addition uniform stirring, after causticization, solution 9 enters subsider 2 and carries out solid-liquid separation, after subsider overflow 10 i.e. causticization, after liquid causticization, liquid pump 3 gets to red mud separating, washing operation once or secondary washing subsider, subsider underflow 11 i.e. causticization slag causticization pulp pump 4 gets to red mud separating, washing operation three times, four times or final wash subsider, in causticization process, each causticizing tank and subsider all pass into live steam 6 and are incubated.
Described live steam 6 pressure is 0.6MPa, and temperature is 158 DEG C, to ensure that causticization process solution temperature remains on 95 ~ 98 DEG C.
The amount of described milk of lime should calculate 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, causticization pulp pump 4 after causticization, and after described causticization, liquid pump 3 is for getting to red-mud settlement and separation washing subitem once or secondary washing groove by subsider overflow; Described causticization pulp pump 4 is for getting to red-mud settlement and separation washing subitem three times, four times or final wash groove by subsider underflow.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.
Embodiment 2
The causticization while that the present embodiment being
As shown in Figure 2, the next secondary of red mud separating, washing operation or three washing lotions are entered each causticizing tank 103 as causticization stoste 7 and milk of lime 8 by the present embodiment and being distinguished as of embodiment 1 simultaneously, and other are identical with embodiment 1.
Claims (6)
1. a lateral flow causticization method for Bayer process alumina producing, is characterized in that; For taking gibbsite as the Bayer process alumina producing of raw material; The causticization stoste of described lateral flow causticization method is secondary or three washing lotions of red mud separating, washing operation; Described lateral flow causticization method is used for substituting evaporation salt discharge process;
The secondary come red mud separating, washing operation or three washing lotions enter each causticizing tank as causticization stoste simultaneously, milk of lime is added in each causticizing tank, carry barrel to causticizing tank to pass into pressurized air and carry material and make causticization solution enter subsider to carry out solid-liquid separation, stop in causticizing tank at least 2 hours and in addition uniform stirring, after subsider overflow and causticization, liquid pump gets to red mud separating, washing operation once or secondary washing subsider, and subsider underflow and causticization slag pump get to red mud separating, washing operation three times, four times or final wash subsider; 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 DEG C, to ensure that causticizing tank temperature remains on 95 ~ 98 DEG C.
2. realize a device for method described in claim 1, it 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 described liquid pump is used for subsider overflow to get to red-mud settlement and separation washing subitem once or secondary washing groove; Described causticization pulp pump is used for subsider underflow being got to red-mud settlement and separation washing subitem three times, four times or final wash groove.
3. device according to claim 2, is characterized in that: subsider is two groups.
4. device according to claim 3, is characterized in that: two groups of public liquid pumps of subsider.
5. device according to claim 3, is characterized in that: two groups of public causticization pulp pumps of subsider.
6. device according to claim 2, 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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| 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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| CN103848446A CN103848446A (en) | 2014-06-11 |
| CN103848446B true 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 |
-
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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