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Method for removing sodium oxalate in series two-stage decomposition aluminum oxide production system

A technology of sodium oxalate and series method, which is applied in the preparation of alumina/aluminum hydroxide, alkali metal aluminate/alumina/aluminum hydroxide, etc., and can solve the cost of remelting caustic slag and causticization of fine seed washing solution Advanced problems, to achieve the effect of eliminating the direct effect

Pending Publication Date: 2021-12-07
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can remove sodium oxalate in the system, but there are high cost of causticization of fine seed washing liquid and re-dissolution of causticization slag

Method used

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  • Method for removing sodium oxalate in series two-stage decomposition aluminum oxide production system

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Effect test

Embodiment 1

[0022] As shown in the figure, the present invention is a method for removing sodium oxalate in the two-stage decomposition production alumina system of the series method. The fine seed slurry classified by the cyclone is fed to the filter 1 for separation, and the separated mother liquor enters the mother liquor After receiving the liquid tank 3, it enters the mother liquid tank 6, and the mother liquid entering the mother liquid tank 6 is sent to the semen cooling process; the separated fine seeds are washed, 3 times of washing liquid cycle washing and the last hot water washing, and the lotion liquid cycle washing The washing liquid entering the washing liquid tank 7 is sent back to the filter 1 through the circulating washing liquid pump 8 to wash the fine seeds, and the last hot water washing is to add 90°C hot water to wash the fine seeds; The liquid enters the washing liquid tank 7 through the washing liquid receiving tank 4, and the washed fine seeds enter the filter ca...

Embodiment 2

[0025] As shown in the figure, the present invention is a method for removing sodium oxalate in the two-stage decomposition production alumina system of the series method. The fine seed slurry classified by the cyclone is fed to the filter 1 for separation, and the separated mother liquor enters the mother liquor After receiving the liquid tank 3, it enters the mother liquid tank 6, and the mother liquid entering the mother liquid tank 6 is sent to the semen cooling process; the separated fine seeds are washed, 2 times of washing liquid cycle washing and the last hot water washing, and the lotion liquid cycle washing The washing liquid entering the washing liquid tank 7 is sent back to the filter 1 through the circulating washing liquid pump 8 to wash the fine seeds, and the last hot water washing is to add hot water at 85°C to wash the fine seeds; The liquid enters the washing liquid tank 7 through the washing liquid receiving tank 4, and the washed fine seeds enter the filter...

Embodiment 3

[0028] As shown in the figure, the present invention is a method for removing sodium oxalate in the two-stage decomposition production alumina system of the series method. The fine seed slurry classified by the cyclone is fed to the filter 1 for separation, and the separated mother liquor enters the mother liquor After receiving the liquid tank 3, it enters the mother liquid tank 6, and the mother liquid entering the mother liquid tank 6 is sent to the semen cooling process; the separated fine seeds are washed, 3 times of washing liquid cycle washing and the last hot water washing, and the lotion liquid cycle washing The washing liquid entering the washing liquid tank 7 is sent back to the filter 1 through the circulating washing liquid pump 8 to wash the fine seeds, and the last hot water washing is to add 95°C hot water to wash the fine seeds; The liquid enters the washing liquid tank 7 through the washing liquid receiving tank 4, and the washed fine seeds enter the filter ca...

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Abstract

The invention relates to a method for removing sodium oxalate, in particular to a method for removing sodium oxalate in a series two-stage decomposition aluminum oxide production system. Fine seed slurry classified by the cyclone is fed to the filter for separation, separated mother liquor enters the mother liquor receiving tank and then enters the mother liquor tank, the separated fine seeds are washed with hot water, washing liquor after washing enters the washing liquor tank through the washing liquor receiving tank, the washed fine seeds enter the filter cake tank, and the filter cake tank enters the filter cake tank. When the concentration of sodium oxalate in the washing liquid in the washing liquid tank is accumulated to a specified value, the washing liquid is conveyed to the slurrying device to be mixed with the red mud and then enters the red mud tank to be stirred into slurry, the red mud slurry carrying sodium oxalate is conveyed to the sintering method system, and the sodium oxalate can be decomposed and eliminated after being sintered. The method has the advantages that sodium oxalate in the washing liquid can be thoroughly decomposed and eliminated in a sintering mode, and then the content of sodium oxalate in a system is gradually reduced. The elimination effect of sodium oxalate is direct, efficient, economical and feasible.

Description

technical field [0001] The invention relates to a method for removing sodium oxalate, in particular to a method for removing sodium oxalate in a series method two-stage decomposition production alumina system. Background technique [0002] China is the world's largest producer of alumina, with an output of approximately 80 million tons of alumina in 2018. As domestic bauxite is getting less and less, domestic alumina companies are increasingly importing foreign gibbsite ore. Gibbsite ore generally adopts low-temperature Bayer method and two-stage decomposition process. There are also some enterprises with a sintering system that will send the red mud after gibbsite dissolution to sintering to form a series production system to further recover the residual alumina in the red mud to increase economic benefits. [0003] Imported gibbsite ore generally has the characteristics of high organic matter content, and the organic matter will gradually be converted into sodium oxalate...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/06
CPCC01F7/02C01F7/06
Inventor 王会兴李志国
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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