Seed precipitation decomposition process for high-content total organic carbon in low-temperature Bayer process

A technology of total organic carbon and Bayer method, which is applied in the field of low-temperature Bayer method and high total organic carbon seed decomposition technology, which can solve the problems of affecting decomposition rate and seed crystal agglomeration, difficult washing of flat plate filter, and scabbing of decomposition tank , to achieve the effect of helping to control the decomposition granularity

Pending Publication Date: 2020-02-28
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of processing Australian ore to produce sandy alumina by low-temperature Bayer method, the high content of organic matter in Australian ore has a great negative impact on the decomposition process. Among them, the organic matter in the form of oxalate has the greatest impact on the decomposition process. During the decomposition process, With the increase of oxalate concentration, a large number of oxalate crystals will be precipitated when the supersaturated state is reached. These oxalate crystals will seriously affect the decomposition rate and the agglomeration of seed crystals, resulting in severe scabbing of the decomposition tank and obviously finer products. chemical, flat plate filter washing difficulties and other problems

Method used

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  • Seed precipitation decomposition process for high-content total organic carbon in low-temperature Bayer process
  • Seed precipitation decomposition process for high-content total organic carbon in low-temperature Bayer process
  • Seed precipitation decomposition process for high-content total organic carbon in low-temperature Bayer process

Examples

Experimental program
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Effect test

Embodiment 1

[0058] The low-temperature Bayer method high total organic carbon species decomposition process provided in this example is a one-stage decomposition process, and the ore origin is India, including the following steps:

[0059] Step 1: Add oxalate seed crystals to the circulating mother liquor to control the solid content to 65g / L, and adjust the temperature of the circulating mother liquor to 51°C to precipitate oxalate in the circulating mother liquor to obtain a low oxalate mother liquor.

[0060] Step 2: Adjust the concentration of caustic soda in the circulating mother liquor to 199g / L, and mix the adjusted circulating mother liquor with the above-mentioned Australian ore to obtain a batching ore, and perform bauxite dissolution, red mud separation and washing on the batching ore , to obtain sodium aluminate solution;

[0061] Step 3: reducing the oxalate concentration in the sodium aluminate solution to obtain a low oxalate sodium aluminate solution;

[0062] Step 4: ad...

Embodiment 2

[0069] The low-temperature Bayer method high total organic carbon species decomposition process provided in this example is a one-stage decomposition process, and the origin of the ore is Brazil, including the following steps:

[0070] Step 1: Add oxalate seed crystals to the circulating mother liquor, control the solid content to 50g / L, and adjust the temperature of the circulating mother liquor to 50-52°C to precipitate oxalate in the circulating mother liquor to obtain a low oxalate mother liquor.

[0071] Step 2: Adjust the caustic alkali concentration in the circulating mother liquor to 198g / L, mix the adjusted circulating mother liquor with the above-mentioned Australian ore to obtain a batching ore, and perform bauxite dissolution, red mud separation and washing on the batching ore , to obtain sodium aluminate solution;

[0072] Step 3: reducing the oxalate concentration in the sodium aluminate solution to obtain a low oxalate sodium aluminate solution;

[0073] Step 4...

Embodiment 3

[0080] The low-temperature Bayer method high total organic carbon species decomposition process provided in this example is a one-stage decomposition process, and the ore origin is Malaysia, including the following steps:

[0081] Step 1: Add oxalate seed crystals to the circulating mother liquor to control the solid content to 80g / L, and adjust the temperature of the circulating mother liquor to 50-52°C to precipitate oxalate in the circulating mother liquor to obtain a low oxalate mother liquor.

[0082] Step 2: Adjust the concentration of caustic soda in the circulating mother liquor to 200g / L, and mix the adjusted circulating mother liquor with the above-mentioned Australian ore to obtain a batching ore, and perform bauxite dissolution, red mud separation and washing on the batching ore , to obtain sodium aluminate solution;

[0083] Step 3: reducing the oxalate concentration in the sodium aluminate solution to obtain a low oxalate sodium aluminate solution;

[0084] Step...

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Abstract

The invention provides a seed precipitation decomposition process for high-content total organic carbon in low-temperature Bayer process, belonging to the field of aluminum oxide production. The seedprecipitation decomposition process is a one-stage decomposition process and comprises the following steps of: reducing the concentration of oxalate in circulating mother liquor to obtain low-oxalate-content mother liquor; adjusting the concentration of caustic alkali in the circulating mother liquor, subjecting the adjusted circulating mother liquor to batching so as to obtain batched ore, and performing bauxite dissolution, red mud separation and washing on the batched ore to obtain a sodium aluminate solution; reducing the concentration of oxalate in the sodium aluminate solution to obtaina low-oxalate-content sodium aluminate solution; and adding seeds into the low-oxalate-content sodium aluminate solution for decomposition to obtain aluminum hydroxide crystals, wherein the aluminum hydroxide crystals comprise coarse-grained aluminum hydroxide crystals and fine-grained aluminum hydroxide crystals, and the content of the fine-grained aluminum hydroxide crystals is controlled.

Description

technical field [0001] The invention belongs to the field of alumina production, and in particular relates to a low-temperature Bayer process for decomposing high total organic carbon species. Background technique [0002] In the process of processing Australian ore to produce sandy alumina by low-temperature Bayer method, the high content of organic matter in Australian ore has a great negative impact on the decomposition process. Among them, the organic matter in the form of oxalate has the greatest impact on the decomposition process. During the decomposition process, With the increase of oxalate concentration, a large number of oxalate crystals will be precipitated when the supersaturated state is reached. These oxalate crystals will seriously affect the decomposition rate and the agglomeration of seed crystals, resulting in severe scabbing of the decomposition tank and obviously finer products. chemical, flat plate filter washing difficulties and other issues. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06C01F7/14
CPCC01F7/06C01F7/0646C01F7/14
Inventor 王磊张任孙树举黄恩杰宁阳东郭秀爽
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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