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Production method of high-whiteness aluminum hydroxide

A production method, aluminum hydroxide technology, applied in the direction of alkali metal aluminate/aluminum oxide/aluminum hydroxide preparation, etc., can solve the problems of low whiteness of aluminum hydroxide, unstable product quality, etc., and achieve stable quality, easy Operation, the effect is obvious

Inactive Publication Date: 2012-02-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome defects such as low whiteness of aluminum hydroxide and unstable product quality in the existing method of producing high-whiteness aluminum hydroxide by sintering sodium aluminate solution, and to provide a A new production method of high-whiteness aluminum hydroxide, the aluminum hydroxide prepared by this production method has high whiteness and stable product quality

Method used

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Effect test

Embodiment 1

[0021] After the bauxite is crushed, the ingredients are sintered at high temperature; the sintered product is added to the dissolution preparation solution (total alkali concentration N a2 o T :60g / L, alumina concentration Al 2 o 3 : 45g / L, carbonate alkali concentration N a2 o C :20g / L), wherein sodium sulfide is added to the dissolution preparation solution, and the amount of sodium sulfide added is 1Kg / m 3 . In the process of dissolving the alumina clinker, the preparation solution added with sodium sulfide reacts with heavy metal ions such as chromium and copper in the clinker to form precipitates, and the dissolution slurry is subjected to solid-liquid separation to purify the solution. After testing, the concentrations of chromium ions or copper ions in the purified solution are both less than 1.0ppm. The purified solution is desiliconized (to increase the A / S of the solution), and the desiliconized solution is decomposed to obtain high-white aluminum hydroxide. ...

Embodiment 2

[0025] After the bauxite is crushed, it is batched and sintered at high temperature; the sintered product is added to the dissolution preparation solution (total alkali concentration N a2 o T :60g / L, alumina concentration Al 2 o 3 : 45g / L, carbonate alkali concentration N a2 o C :20g / L), wherein sodium sulfide is added to the dissolution preparation solution, and the amount of sodium sulfide added is 5Kg / m 3 . In the process of dissolving the alumina clinker, the preparation solution added with sodium sulfide reacts with heavy metal ions such as chromium and copper in the clinker to form precipitates, and the dissolution slurry is subjected to solid-liquid separation to purify the solution. After testing, the concentrations of chromium ions or copper ions in the purified solution are both less than 1.0ppm. The purified solution is desiliconized (to increase the A / S of the solution), and the desiliconized solution is decomposed to obtain high-white aluminum hydroxide.

...

Embodiment 3

[0029] After the bauxite is crushed, the ingredients are sintered at high temperature; the sintered product is added to the dissolution preparation solution (total alkali concentration N a2 o T :60g / L, alumina concentration Al 2 o 3 : 45g / L, carbonate alkali concentration N a2 o C :20g / L), wherein sodium sulfide is added to the dissolution preparation solution, and the amount of sodium sulfide added is 0.1Kg / m 3 about. In the process of dissolving the alumina clinker, the preparation solution added with sodium sulfide reacts with heavy metal ions such as chromium and copper in the clinker to form precipitates, and the dissolution slurry is subjected to solid-liquid separation to purify the solution. After testing, the concentrations of chromium ions or copper ions in the purified solution are both less than 1.0ppm. The purified solution is desiliconized (to increase the A / S of the solution), and the desiliconized solution is decomposed to obtain high-white aluminum hydro...

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Abstract

The invention discloses a production method of high-whiteness aluminum hydroxide. The production method comprises the following steps of crushing bauxite, carrying out proportioning, sintering at a high temperature, adding the products obtained by sintering into a digestion blending solution for digestion to obtain a sodium aluminate solution, and carrying out silicon removal purification and decomposition of the sodium aluminate solution to obtain an aluminum hydroxide solution, wherein the digestion blending solution contains a cleaning agent. In the invention, the cleaning agent added during alumina clinker digestion can react with heavy metal ions in alumina clinkers to produce precipitates in alumina clinker digestion, so that heavy metal ion impurities in the sodium aluminate solution are removed effectively; and the purified sodium aluminate solution is subjected to silicon removal purification and decomposition. Aluminum hydroxide obtained by the production method has stable whiteness of 94+ / -1%. The production method can improve effectively aluminum hydroxide product whiteness, can stabilize aluminum hydroxide product quality, has a simple process flow, is easy for operation, and has obvious effects.

Description

technical field [0001] The invention relates to a method for producing aluminum hydroxide, in particular to a method for producing high-whiteness aluminum hydroxide by using a sodium aluminate solution produced by a sintering method, and belongs to the field of aluminum hydroxide production. Background technique [0002] The method of producing high-whiteness aluminum hydroxide by sintering sodium aluminate solution usually includes the following steps: crushing bauxite and then batching, and sintering at high temperature; adding dissolution preparation solution to the sintered product (clinker), The clinker is dissolved and separated to obtain sodium aluminate solution and sintering red mud; the sodium aluminate solution is desiliconized, refined and decomposed to obtain high-white aluminum hydroxide. [0003] In the process of producing high-whiteness aluminum hydroxide using sodium aluminate solution in the sintering alumina production process as raw material, heavy met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 杨会宾薛忠秀王晓锋姜梅潘明亮张雷郑秀芳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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