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: 2015-09-23
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new method described by this inventor allows for direct sending the acidic solution into an autoclave instead of relying on expensive equipment such as filters or other chemicals that are used during traditional methods like lime-cake production. It eliminates the need for complex operations associated with these processes while still producing high quality aluminas. Additionally, it saves money compared to current methods without adding any extra steps because there're no harmful substances involved. Overall, this technology makes efficient use of resources more effective than previous ways.

Problems solved by technology

This patented technical problem addressed during producing Aluminas through bauxite processes involves increasing concentrations of NaOH (a type of chemical called soda) due to excessive calcium oxalate being added into the solution when it comes out of suspension after evaporative cooling. These deposits can cause issues such as decreased efficiency in heat exchangers used for condensation refrigerators that are commonly found at home and industrial sites where large amounts of water vapor may be generated. Additionally, these deposit buildup on equipment reduces their effectiveness over time.

Method used

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  • 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 the

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 the

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 communicates with the top of the pressure cooking dissolution dilution tank 5 through the pipeline, and the lower part of the pressure cooking dissolution dilution tank 5 is connected with the dilution pump 6 through the pipeline, and the dilution pump 6 communicates with the red mud separation and washing system 7 through the 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

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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

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Claims

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Application Information

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Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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