CN203741055U - Causticizing device for aluminum oxide production - Google Patents
Causticizing device for aluminum oxide production Download PDFInfo
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- CN203741055U CN203741055U CN201420122297.4U CN201420122297U CN203741055U CN 203741055 U CN203741055 U CN 203741055U CN 201420122297 U CN201420122297 U CN 201420122297U CN 203741055 U CN203741055 U CN 203741055U
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- causticizing
- pipeline
- causticization
- tank
- reduced
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Abstract
The utility model relates to a causticizing device, in particular to a causticizing device for aluminum oxide production. The causticizing device adopts the structure that the top of a causticizing tank is communicated with a pipeline of crystalline alkaloid obtained by evaporating mother liquid and a pipeline of lime milk for causticizing; the lower part of the causticizing tank is communicated with the top of an autoclave leaching diluting tank through a pipeline; the lower part of the autoclave leaching diluting tank is connected with a diluting pump through the pipeline; the diluting pump is communicated with a red mud separating and washing system through the pipeline. The causticizing device disclosed by the utility model has the advantages that the causticized slurry is directly fed to the autoclave leaching diluting tank, so that a causticizing process is simplified, a causticizing filter and corresponding subsidiary facilities are eliminated and the investment of a causticizing process is reduced; besides, the flow is simplified, so that the operation expenses for causticizing are reduced; the consumption of red mud washing water is reduced and the water inlet consumption of the system is reduced, so that the evaporation steam consumption of the system is reduced and the aim of energy conservation is achieved; the molecular ratio of the leached slurry is increased, the hydrolysis loss of the separating and washing process of the red mud is reduced and the recovery rate of the aluminum oxide is increased.
Description
Technical field
The utility model relates to a kind of causticization device, relates in particular to causticization device in a kind of alumina producing.
Background technology
Having in the world 90% aluminum oxide is to adopt Bayer process to produce.In alumina producing Bayer process process, because ore, lime or airborne carbonic acid gas can enter production system, cause concentration of sodium carbonate in circulation alkali liquor to raise, production system and quality product are caused to disadvantageous effect.At present, the crystalline alkali that Bayer process alumina producer adopts milk of lime to discharge evaporation salt discharge is carried out causticization, causticization filter solid-liquid separation for the slurries after causticization, and the former liquid bath of filtrate devaporation and decomposition nut liquid be evaporation concentration together, filter cake removes red mud separation tank, washs rear outer row together with red mud.Energy consumption is high like this, and the rate of recovery of aluminum oxide is low.
Summary of the invention
For solving the problems of the technologies described above the utility model, provide causticization device in a kind of alumina producing, object is to simplify technique, reduces investment and working cost, reduces red mud wash water, reduces hydrolysising loss and energy-conservation, improves the rate of recovery of aluminum oxide.
Causticization device in a kind of alumina producing of the utility model for achieving the above object, by following structure, formed: causticizing tank, the top of causticizing tank and mother liquid evaporation carry out crystalline alkali pipeline and causticization milk of lime pipeline communication, the bottom of causticizing tank is communicated with pressing the top of boiling solution thinning groove by pipeline, the bottom that pressure is boiled solution thinning groove is connected with dilution pumps by pipeline, and dilution pumps is by pipeline and red mud separating, washing system connectivity.
The pipeline that causticizing tank and pressure are boiled between solution thinning groove is provided with slush pump.
A causticization process for causticization device in alumina producing, the crystalline alkali that mother liquid evaporation comes is carried out causticization in causticizing tank, and the causticization slurries after causticization need not pass through solid-liquid separation, directly by slush pump, are delivered to press and boil solution thinning groove, mix with slip after stripping.
Described crystalline alkali causticization adopts milk of lime causticization, wherein in milk of lime CaO with by causticization solution Na
2the mol ratio of O is 1 ~ 1.5, causticization stoste Na
2o concentration 30 ~ 80g/L.
It is a kind of in high pressure digestion or low pressure stripping that described pressure is boiled stripping.
The utility model has the advantages of: the causticization rear slurry the utility model proposes is directly delivered to press and boiled solution thinning groove, simplified causticization process, causticization filter and corresponding affiliated facility have been cancelled, reduce the investment of causticization operation, due to the simplification of flow process, also reduced the working cost of causticization simultaneously; Reduce red mud wash water consumption, the water inlet of minimizing system, thus reduce system steam consumption for evaporation, reach energy-conservation object; Improve stripping rear slurry molecular ratio, reduce red mud separating, washing process hydrolysising loss, improve the rate of recovery of aluminum oxide.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model.
In figure: 1, mother liquid evaporation carrys out crystalline alkali pipeline; 2, causticization milk of lime pipeline; 3, causticizing tank; 4, slush pump; 5, press and boil solution thinning groove; 6, dilution pumps; 7, red mud separating, washing system.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further details.
Embodiment 1
As shown in the figure, causticization device in a kind of alumina producing, by following structure, formed: causticizing tank 3, the top of causticizing tank 3 comes crystalline alkali pipeline 1 and causticization to be communicated with milk of lime pipeline 2 with mother liquid evaporation, the bottom of causticizing tank 3 is communicated with pressing the top of boiling solution thinning groove 5 by pipeline, the bottom that pressure is boiled solution thinning groove 5 is connected with dilution pumps 6 by pipeline, and dilution pumps 6 is communicated with red mud separating, washing system 7 by pipeline.The pipeline that causticizing tank 3 and pressure are boiled between solution thinning groove 5 is provided with slush pump 4.
Crystalline alkali and causticization that mother liquid evaporation comes are sent into respectively causticizing tank 3 with milk of lime, wherein in milk of lime CaO with by causticization solution Na
2the mol ratio of O, [CaO]/[Na
2o]=1, causticization stoste Na
2o concentration 30g/L; In causticizing tank 3, complete after causticization, causticization slurries are directly sent into press by slush pump 4 and are boiled solution thinning groove 5, boil stripping slurry mix with pressure, and after mixing, slip is delivered to red mud separating, washing system 7 by dilution pumps 6.By implementing this technical process, reduce red mud wash water 0.2t/t-Al
2o
3, the system steam consumption reduces 60kg/t-Al
2o
3, alumina recovery rate improves 0.2%.
Embodiment 2
As shown in the figure, causticization device in a kind of alumina producing, by following structure, formed: causticizing tank 3, the top of causticizing tank 3 comes crystalline alkali pipeline 1 and causticization to be communicated with milk of lime pipeline 2 with mother liquid evaporation, the bottom of causticizing tank 3 is communicated with pressing the top of boiling solution thinning groove 5 by pipeline, the bottom that pressure is boiled solution thinning groove 5 is connected with dilution pumps 6 by pipeline, and dilution pumps 6 is communicated with red mud separating, washing system 7 by pipeline.The pipeline that causticizing tank 3 and pressure are boiled between solution thinning groove 5 is provided with slush pump 4.
Crystalline alkali and causticization that mother liquid evaporation comes are sent into respectively causticizing tank 3 with milk of lime, wherein in milk of lime CaO with by causticization solution Na
2the mol ratio of O, [CaO]/[Na
2o]=1.5, causticization stoste Na
2o concentration 80g/L; In causticizing tank 3, complete after causticization, causticization slurries are directly sent into press by slush pump 4 and are boiled solution thinning groove 5, boil stripping slurry mix with pressure, and after mixing, slip is delivered to red mud separating, washing system 7 by dilution pumps 6.By implementing this technical process, reduce red mud wash water 0.05t/t-Al
2o
3, the system steam consumption reduces 15kg/t-Al
2o
3, alumina recovery rate improves 1%.
Embodiment 3
As shown in the figure, causticization device in a kind of alumina producing, by following structure, formed: causticizing tank 3, the top of causticizing tank 3 comes crystalline alkali pipeline 1 and causticization to be communicated with milk of lime pipeline 2 with mother liquid evaporation, the bottom of causticizing tank 3 is communicated with pressing the top of boiling solution thinning groove 5 by pipeline, the bottom that pressure is boiled solution thinning groove 5 is connected with dilution pumps 6 by pipeline, and dilution pumps 6 is communicated with red mud separating, washing system 7 by pipeline.The pipeline that causticizing tank 3 and pressure are boiled between solution thinning groove 5 is provided with slush pump 4.
Crystalline alkali and causticization that mother liquid evaporation comes are sent into respectively causticizing tank 3 with milk of lime, wherein in milk of lime CaO with by causticization solution Na
2the mol ratio of O, [CaO]/[Na
2o]=1.2, causticization stoste Na
2o concentration 60g/L; In causticizing tank 3, complete after causticization, causticization slurries are directly sent into press by slush pump 4 and are boiled solution thinning groove 5, boil stripping slurry mix with pressure, and after mixing, slip is delivered to red mud separating, washing operation 7 by dilution pumps 6.By implementing this technical process, reduce red mud wash water 0.1t/t-Al
2o
3, the system steam consumption reduces 50kg/t-Al
2o
3, alumina recovery rate improves 0.7%.
Claims (2)
1. causticization device in an alumina producing, it is characterized in that being formed by following structure: causticizing tank, the top of causticizing tank and mother liquid evaporation carry out crystalline alkali pipeline and causticization milk of lime pipeline communication, the bottom of causticizing tank is communicated with pressing the top of boiling solution thinning groove by pipeline, the bottom that pressure is boiled solution thinning groove is connected with dilution pumps by pipeline, and dilution pumps is by pipeline and red mud separating, washing system connectivity.
2. causticization device in a kind of alumina producing according to claim 1, is characterized in that causticizing tank and presses the pipeline boiling between solution thinning groove to be provided with slush pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122297.4U CN203741055U (en) | 2014-03-19 | 2014-03-19 | Causticizing device for aluminum oxide production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122297.4U CN203741055U (en) | 2014-03-19 | 2014-03-19 | Causticizing device for aluminum oxide production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203741055U true CN203741055U (en) | 2014-07-30 |
Family
ID=51340882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420122297.4U Withdrawn - After Issue CN203741055U (en) | 2014-03-19 | 2014-03-19 | Causticizing device for aluminum oxide production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203741055U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104495887A (en) * | 2014-09-23 | 2015-04-08 | 广西华银铝业有限公司 | Hot water sealing tank of salt elimination causticization system and preparation method thereof |
| CN111362290A (en) * | 2020-05-05 | 2020-07-03 | 湖南诺兰蒂尔环保科技有限公司 | Causticizing process and device for sodium carbonate in sodium aluminate solution |
| CN111960440A (en) * | 2020-09-02 | 2020-11-20 | 陶予敏 | Process for producing soda ash and building insulating brick from red mud |
-
2014
- 2014-03-19 CN CN201420122297.4U patent/CN203741055U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104495887A (en) * | 2014-09-23 | 2015-04-08 | 广西华银铝业有限公司 | Hot water sealing tank of salt elimination causticization system and preparation method thereof |
| CN104495887B (en) * | 2014-09-23 | 2016-06-29 | 广西华银铝业有限公司 | A kind of hot water sealing groove of salt discharge causticization system and preparation method thereof |
| CN111362290A (en) * | 2020-05-05 | 2020-07-03 | 湖南诺兰蒂尔环保科技有限公司 | Causticizing process and device for sodium carbonate in sodium aluminate solution |
| CN111960440A (en) * | 2020-09-02 | 2020-11-20 | 陶予敏 | Process for producing soda ash and building insulating brick from red mud |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140730 Effective date of abandoning: 20160706 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |