A causticizing device and causticizing process in alumina production

A technology of alumina and causticization, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of low alumina recovery rate and high energy consumption, and achieve the effects of improving recovery rate, simplifying causticizing process, and reducing evaporation steam consumption

Active Publication Date: 2016-07-06
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This way the energy consumption is high and the recovery rate of alumina is low

Method used

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  • A causticizing device and causticizing process in alumina production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] As shown in the figure, a causticizing device in alumina production is composed of the following structure: causticizing tank 3, the top of causticizing tank 3 communicates with mother liquor evaporation crystallization alkali pipeline 1 and lime milk pipeline 2 for causticizing, The lower part of the causticizing tank 3 is connected to the top of the pressure cooking dissolution dilution tank 5 through a pipeline, and the lower part of the pressure cooking dissolution dilution tank 5 is connected to the dilution pump 6 through a pipeline, and the dilution pump 6 is connected to the red mud separation and washing system 7 through a pipeline. A slurry pump 4 is provided on the pipeline between the causticization tank 3 and the pressure cooking dissolution dilution tank 5 .

[0015] The crystallization alkali evaporated from the mother liquor and the milk of lime for causticization are respectively sent to the causticization tank 3, wherein the CaO in the milk of lime and ...

Embodiment 2

[0017] As shown in the figure, a causticizing device in alumina production is composed of the following structure: causticizing tank 3, the top of causticizing tank 3 communicates with mother liquor evaporation crystallization alkali pipeline 1 and lime milk pipeline 2 for causticizing, The lower part of the causticizing tank 3 is connected to the top of the pressure cooking dissolution dilution tank 5 through a pipeline, and the lower part of the pressure cooking dissolution dilution tank 5 is connected to the dilution pump 6 through a pipeline, and the dilution pump 6 is connected to the red mud separation and washing system 7 through a pipeline. A slurry pump 4 is provided on the pipeline between the causticization tank 3 and the pressure cooking dissolution dilution tank 5 .

[0018] The crystallization alkali evaporated from the mother liquor and the milk of lime for causticization are respectively sent to the causticization tank 3, wherein the CaO in the milk of lime and ...

Embodiment 3

[0020] As shown in the figure, a causticizing device in alumina production is composed of the following structure: causticizing tank 3, the top of causticizing tank 3 communicates with mother liquor evaporation crystallization alkali pipeline 1 and lime milk pipeline 2 for causticizing, The lower part of the causticizing tank 3 is connected to the top of the pressure cooking dissolution dilution tank 5 through a pipeline, and the lower part of the pressure cooking dissolution dilution tank 5 is connected to the dilution pump 6 through a pipeline, and the dilution pump 6 is connected to the red mud separation and washing system 7 through a pipeline. A slurry pump 4 is provided on the pipeline between the causticization tank 3 and the pressure cooking dissolution dilution tank 5 .

[0021] The crystallization alkali evaporated from the mother liquor and the milk of lime for causticization are respectively sent to the causticization tank 3, wherein the CaO in the milk of lime and ...

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Abstract

The invention relates to a causticizing device and a causticizing process in alumina production. The causticizing device adopts a structure that a causticizing tank is provided, the top of the causticizing tank is communicated with a pipeline of crystalline alkali obtained by evaporating a mother liquid and a pipeline of lime milk for causticizing; the lower part of the causticizing tank is communicated with the top of an autoclaving leaching diluting tank through a pipeline; the lower part of the autoclaving leaching diluting tank is connected with a diluting pump through a pipeline; the diluting pump is communicated with a red mud separating and washing system through a pipeline. The causticizing device disclosed by the invention has the advantages that the causticized slurry is directly fed to the autoclaving leaching diluting tank, so that the causticizing process is simplified, a causticizing filter and corresponding subsidiary facilities are eliminated and the investment of the causticizing process is reduced; besides, the flow is simplified, so that the operation expenses for causticizing are reduced; the amount of red mud washing water is reduced and the water inlet amount of the system is reduced, so that the evaporation steam consumption of the system is reduced and the objective of energy conservation is achieved; the molecular ratio of the leached slurry is increased, the hydrolysis loss of the red mud separating and washing process is reduced and the recovery rate of alumina is increased.

Description

technical field [0001] The invention relates to a causticizing device and a causticizing process, in particular to a causticizing device and a causticizing process in alumina production. Background technique [0002] 90% of the world's alumina is produced by the Bayer process. During the production of alumina by the Bayer process, because ore, lime or carbon dioxide in the air will enter the production system, the concentration of sodium carbonate in the circulating lye will increase, which will adversely affect the production system and product quality. At present, the Bayer process alumina plant uses lime milk to causticize the crystalline alkali discharged from the evaporation and discharge of salt. The causticized slurry is separated from solid and liquid by a causticizing filter. Go to the red mud separation settling tank, wash together with the red mud and then discharge. The energy consumption is high like this, and the recovery rate of alumina is low. Contents of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 李来时廖新勤
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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