CN101372347A - Salt drainage and caustification process as well as caustification system for aluminum oxide production by Bayer process - Google Patents
Salt drainage and caustification process as well as caustification system for aluminum oxide production by Bayer process Download PDFInfo
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- CN101372347A CN101372347A CNA2007100125543A CN200710012554A CN101372347A CN 101372347 A CN101372347 A CN 101372347A CN A2007100125543 A CNA2007100125543 A CN A2007100125543A CN 200710012554 A CN200710012554 A CN 200710012554A CN 101372347 A CN101372347 A CN 101372347A
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- causticization
- subsider
- bayer
- alumina producing
- filter cake
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Abstract
The invention discloses a brine discharge and causticization process and a causticization system in an alumina production system, in particular relates to a brine discharge and causticization process and a causticization system in a system producing alumina by Bayer process. The causticization system is characterized in that the output end of an evaporation mother liquor (1) delivery line is connected with a press filter (2), the outlet end of the press filter (2) is connected with a collecting tank (4) and a filter cake tank (6) respectively, the filter cake tank (6) is connected with a settling tank (8), the output end of a lime cream (12) delivery line is connected with the settling tank (8), and the outlet end of the settling tank (8) is connected with the collecting tank (4). The invention can rapidly and effectively separate salt from the evaporation mother liquor. The setting tank is taken as a causticization reactor, which has the advantages of full reaction, high reaction efficiency and that the causticized slag is easier to separate. The causticized slag are filtered by a plate-and-frame filter press, thus the processed causticized slag contain less solid content and have high alkali recovery.
Description
Technical field
The present invention relates to salt discharge in the alumina producing system, causticization process and causticization system, relate in particular to salt discharge in a kind of bayer's process alumina producing system, causticization process and causticization system.
Background technology
Evaporation salt discharge and causticization are used following method usually in the existing alumina producing: the mother liquid evaporation that vaporizer is forced to imitate out enters the subsider sedimentation, salt is filtered by rotary drum filter after by sedimentation and sends into causticizing tank behind the moisture and carry out causticizing reaction, the causticization system is made up of a plurality of causticizing tanks, and the causticization slurries have the fixed residence time in each causticizing tank.The causticization slurries flow into next causticizing tank by a causticizing tank through stripping tube, and a series of causticizing tank series connection is used for guaranteeing that causticizing reaction is complete.Such causticization method equipment is many, and investment is big, and the causticization slag reclaims difficulty.
Summary of the invention
Technical problem to be solved by this invention provides evaporates salt discharge, pipeline causticization process and causticization system in a kind of bayer's process alumina producing, the objective of the invention is salt in the bayer's process alumina producing is effectively separated with mother liquid evaporation, improve the efficient that alkali reclaims, reduce investment outlay simultaneously, cut down the consumption of energy.
For reaching above-mentioned purpose, the present invention is achieved in that salt discharge of a kind of bayer's process alumina producing and causticization process, the mother liquid evaporation 1 that the vapo(u)rization system pressure imitates out in the alumina producing of the present invention enters pressure filter 2 and carries out liquid-solid separation, parting liquid 3 enters intercepting basin 4, isolating inorganic salt filter cake 5 enters filter cake groove 6, and then be delivered to subsider 8, milk of lime 12 enters in the subsider 8 and inorganic salt generation causticizing reaction, the overflow 9 of subsider 8 enters intercepting basin 4, and alkali lye is sent to alkali liquor preparing workshop section in the intercepting basin 4.
The underflow of described subsider 8 is that causticization slag 18 enters pressure filter 11 and filters, and parting liquid 14 enters intercepting basin 4, and isolating filter cake 15 enters filter cake groove 16.
Described causticization slag 18 delivers into pressure filter 11 by pump 10.
Inorganic salt are delivered to subsider 8 via rubber conveyer 7 in the described filter cake groove 6.
Alkali lye is carried lixiviating liquid allotment workshop section by pump 17 in the described intercepting basin 4.
Described milk of lime 12 enter in the subsider 8 be under the heating of heating medium 13 with inorganic salt generation causticizing reaction, type of heating is direct heating or indirect heating.
The time of described causticizing reaction is 2-4 hour.
The salt discharge of a kind of bayer's process alumina producing, causticization system, its structure is as follows: the output terminal of mother liquid evaporation 1 transfer line is connected with pressure filter 2, the exit end of pressure filter 2 is connected with filter cake groove 6 with intercepting basin 4 respectively, filter cake groove 6 is connected with subsider 8, the output terminal of milk of lime 12 transfer lines is connected with subsider 8, the exit end of subsider 8 and intercepting basin 4.
The exit end of described subsider 8 also is connected with pressure filter 11, and the exit end of pressure filter 11 is connected with filter cake groove 16 with intercepting basin 4 respectively.
Described intercepting basin 4 exit end are connected with pump 17.
Described subsider 8 is connected with pressure filter 11 through pump 10.
Described pressure filter 2 and pressure filter 11 are plate and frame(type)filter press.
Described filter cake groove 6 is connected with subsider 8 via rubber conveyer 7.
Described subsider 8 is for having the tapered subsider of whipping appts.
Advantage of the present invention is as follows with effect: the present invention can separate the salt in the mother liquid evaporation fast and effectively.Use subsider as the reactor of causticization not only sufficient reacting, reaction efficiency height, and separate easily causticization slag more.Use plate-and-frame filter press that the causticization slag is carried out filtration treatment, processing back causticization slag contains low admittedly, alkali lye rate of recovery height.Adopt two sections filtering processes can more effectively realize solid-liquid separation
Description of drawings
Fig. 1 is salt discharge in a kind of bayer's process alumina producing of the present invention, causticization process schema.
In the accompanying drawing: 1, mother liquid evaporation; 2, pressure filter; 3, parting liquid; 4, intercepting basin; 5, filter cake; 6, filter cake groove; 7, rubber conveyer; 8, subsider; 9, overflow; 10, pump; 11, pressure filter; 12, milk of lime; 13, heating medium; 14, parting liquid; 15, filter cake; 16, filter cake groove; 17, pump; 18, causticization slag.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further details, but protection scope of the present invention not hand embodiment limit.
As shown in Figure 1, salt discharge in the bayer's process alumina producing of the present invention, causticization process is as follows: the mother liquid evaporation 1 that the vapo(u)rization system pressure imitates out in the alumina producing enters one-level plate and frame(type)filter press 2 and carries out liquid-solid separation, parting liquid 3 enters intercepting basin 4, isolating inorganic salt filter cake 5 enters filter cake groove 6, inorganic salt are delivered to subsider 8 via rubber conveyer 7 in the filter cake groove 6, milk of lime 12 enters in the subsider 8 and reacts with inorganic salt under the direct or indirect heating of heating medium 13, best Cheng Haowei 2-4 of the time of causticizing reaction hour, the overflow 9 of subsider 8 enters intercepting basin 4, underflow is that causticization slag 18 delivers into secondary plate and frame(type)filter press 11 by pump 10 and filters, parting liquid 14 enters intercepting basin 4, isolating filter cake 15 enters filter cake groove 16, and alkali lye is carried lixiviating liquid allotment workshop section by pump 17 in the intercepting basin 4.Heating medium 13 is any material that can heat.
Salt discharge in the bayer's process alumina producing of the present invention, the causticization system architecture is as follows: the output terminal of the transfer line of mother liquid evaporation 1 is connected with one-level plate and frame(type)filter press 2, the exit end of one-level plate and frame(type)filter press 2 is connected with filter cake groove 6 with intercepting basin 4 respectively, filter cake groove 6 is connected with subsider 8 via rubber conveyer 7, the output terminal of milk of lime 12 transfer lines is connected with subsider 8, the exit end of subsider 8 and intercepting basin 4, the exit end of subsider 8 is connected with secondary plate and frame(type)filter press 11 through pump 10, and the exit end of secondary plate and frame(type)filter press 11 is connected with filter cake groove 16 with intercepting basin 4 respectively.Intercepting basin 4 exit end are connected with pump 17.
Above-mentioned subsider 8 is for having the tapered subsider of whipping appts.
Claims (14)
1. bayer's process alumina producing salt discharge and causticization process, it is characterized in that mother liquid evaporation (1) that vapo(u)rization system in the alumina producing forces to imitate out enters pressure filter (2) and carries out liquid-solid separation, parting liquid (3) enters intercepting basin (4), isolating inorganic salt filter cake (5) enters filter cake groove (6), and then be delivered to subsider (8), milk of lime (12) enters in the subsider (8) and inorganic salt generation causticizing reaction, the overflow (9) of subsider (8) enters intercepting basin (4), and the interior alkali lye of intercepting basin (4) is sent to alkali liquor preparing workshop section.
2. bayer's process alumina producing according to claim 1 salt discharge and causticization process, the underflow that it is characterized in that described subsider (8) is that causticization slag (18) enters pressure filter (11) and filters, parting liquid (14) enters intercepting basin (4), and isolating filter cake (15) enters filter cake groove (16).
3. bayer's process alumina producing according to claim 2 salt discharge and causticization process is characterized in that described causticization slag (18) delivers into pressure filter (11) by pump (10).
4. bayer's process alumina producing according to claim 1 salt discharge and causticization process is characterized in that the interior inorganic salt of described filter cake groove (6) are delivered to subsider (8) via rubber conveyer (7).
5. bayer's process alumina producing according to claim 1 salt discharge and causticization process is characterized in that the interior alkali lye of described intercepting basin (4) is by pump (17) conveying lixiviating liquid allotment workshop section.
6. bayer's process alumina producing according to claim 1 salt discharge and causticization process, it is characterized in that described milk of lime (12) enter in the subsider (8) be under the heating of heating medium (13) with inorganic salt generation causticizing reaction, type of heating is direct heating or indirect heating.
7. bayer's process alumina producing according to claim 1 salt discharge and causticization process, the time that it is characterized in that described causticizing reaction is 2-4 hour.
8. bayer's process alumina producing salt discharge, causticization system, it is characterized in that structure is as follows: the output terminal of mother liquid evaporation (1) transfer line is connected with pressure filter (2), the exit end of pressure filter (2) is connected with filter cake groove (6) with intercepting basin (4) respectively, filter cake groove (6) is connected with subsider (8), the output terminal of milk of lime (12) transfer line is connected with subsider (8), the exit end of subsider (8) and intercepting basin (4).
9. bayer's process alumina producing according to claim 8 salt discharge, causticization system, the exit end that it is characterized in that described subsider (8) also is connected with pressure filter (11), and the exit end of pressure filter (11) is connected with filter cake groove (16) with intercepting basin (4) respectively.
10. bayer's process alumina producing according to claim 8 salt discharge, causticization system is characterized in that the exit end of described intercepting basin (4) is connected with pump (17).
11. bayer's process alumina producing according to claim 8 salt discharge, causticization system is characterized in that described subsider (8) is connected with pressure filter (11) through pump (10).
12. bayer's process alumina producing according to claim 8 salt discharge, causticization system is characterized in that described pressure filter (2) and pressure filter (11) are plate and frame(type)filter press.
13. bayer's process alumina producing according to claim 8 salt discharge, causticization system is characterized in that described filter cake groove (6) is connected with subsider (8) via rubber conveyer (7).
14. according to Claim 8 or 13 described bayer's process alumina producing salt discharges, causticization system, it is characterized in that described subsider (8) is for having the tapered subsider of whipping appts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100125543A CN101372347A (en) | 2007-08-23 | 2007-08-23 | Salt drainage and caustification process as well as caustification system for aluminum oxide production by Bayer process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100125543A CN101372347A (en) | 2007-08-23 | 2007-08-23 | Salt drainage and caustification process as well as caustification system for aluminum oxide production by Bayer process |
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| CN101372347A true CN101372347A (en) | 2009-02-25 |
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| CNA2007100125543A Pending CN101372347A (en) | 2007-08-23 | 2007-08-23 | Salt drainage and caustification process as well as caustification system for aluminum oxide production by Bayer process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092750A (en) * | 2010-12-30 | 2011-06-15 | 中国铝业股份有限公司 | Processing method of salt-drainage filter cakes in aluminum oxide production process based on mixed combination method |
| CN103848446A (en) * | 2012-11-28 | 2014-06-11 | 沈阳铝镁设计研究院有限公司 | Side stream causticization method and apparatus of Bayer process alumina production |
| CN109248554A (en) * | 2018-10-17 | 2019-01-22 | 东方希望(三门峡)铝业有限公司 | Flue gas desulfurization device and flue gas desulphurization system |
| CN112499656A (en) * | 2020-12-16 | 2021-03-16 | 贵州华锦铝业有限公司 | Treatment method of discharged salt causticization slurry in alumina production |
-
2007
- 2007-08-23 CN CNA2007100125543A patent/CN101372347A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092750A (en) * | 2010-12-30 | 2011-06-15 | 中国铝业股份有限公司 | Processing method of salt-drainage filter cakes in aluminum oxide production process based on mixed combination method |
| CN103848446A (en) * | 2012-11-28 | 2014-06-11 | 沈阳铝镁设计研究院有限公司 | Side stream causticization method and apparatus of Bayer process alumina production |
| CN103848446B (en) * | 2012-11-28 | 2016-04-27 | 沈阳铝镁设计研究院有限公司 | A kind of lateral flow causticization method of Bayer process alumina producing and device |
| CN109248554A (en) * | 2018-10-17 | 2019-01-22 | 东方希望(三门峡)铝业有限公司 | Flue gas desulfurization device and flue gas desulphurization system |
| CN112499656A (en) * | 2020-12-16 | 2021-03-16 | 贵州华锦铝业有限公司 | Treatment method of discharged salt causticization slurry in alumina production |
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