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Process for preparing calcium hydroxide, magnesium hydroxide and aluminum hydroxide with mixed hydroxides

A hydroxide, calcium hydroxide technology, applied in the direction of alumina/aluminum hydroxide, magnesium hydroxide, chemical instruments and methods, etc., to achieve the effect of simple operation and less investment in equipment

Inactive Publication Date: 2011-11-30
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if special control measures cannot be taken to deal with the chromium slag and remove the toxicity of the chromium slag, once the environment is polluted, especially groundwater and soil, the consequences will be very serious

Method used

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  • Process for preparing calcium hydroxide, magnesium hydroxide and aluminum hydroxide with mixed hydroxides
  • Process for preparing calcium hydroxide, magnesium hydroxide and aluminum hydroxide with mixed hydroxides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] refer to figure 1 , the method for preparing calcium hydroxide, magnesium hydroxide and aluminum hydroxide with mixed hydroxide, wherein said mixed hydroxide is the mixed hydroxide that controls chromium slag gained, comprises following specific steps:

[0029] Step: A-1: ​​Wash, dry and pulverize the mixed hydroxide obtained from the treatment of chromium slag to obtain a fine powder, and then use an automatic winnowing machine to separate three kinds of powders with different weights. The lighter the powder and the smaller the fineness, weigh the weight of each powder after each winnowing;

[0030] Step B-1: Select a powder of the above three weights to sieve through the eyes to obtain powders of coarse, medium and fine fineness, and weigh the mass ratio of the three fineness powders, so that The mass ratio of the three fineness powders just reaches the mass ratio of calcium hydroxide, magnesium hydroxide and aluminum hydroxide, then the finest powder is calcium hydr...

Embodiment 2

[0039] refer to figure 1 , the method for preparing calcium hydroxide, magnesium hydroxide and aluminum hydroxide with mixed hydroxide, wherein said mixed hydroxide is the mixed hydroxide that controls chromium slag gained, comprises following specific steps:

[0040] Step: A-1: ​​Wash, dry and pulverize the mixed hydroxide obtained from the treatment of chromium slag to obtain a fine powder, and then use an automatic winnowing machine to separate three kinds of powders with different weights. The lighter the powder and the smaller the fineness, weigh the weight of each powder after each winnowing;

[0041] Step B-1: Select a powder of the above three weights to sieve through the eyes to obtain powders of coarse, medium and fine fineness, and weigh the mass ratio of the three fineness powders, so that The mass ratio of the three fineness powders just reaches the mass ratio of calcium hydroxide, magnesium hydroxide and aluminum hydroxide, then the finest powder is calcium hydr...

Embodiment 3

[0050] refer to figure 1 , the method for preparing calcium hydroxide, magnesium hydroxide and aluminum hydroxide with mixed hydroxide, wherein said mixed hydroxide is the mixed hydroxide that controls chromium slag gained, comprises following specific steps:

[0051] Step: A-1: ​​Wash, dry and pulverize the mixed hydroxide obtained from the treatment of chromium slag to obtain a fine powder, and then use an automatic winnowing machine to separate three kinds of powders with different weights. The lighter the powder and the smaller the fineness, weigh the weight of each powder after each winnowing;

[0052] Step B-1: Select a powder of the above three weights to sieve through the eyes to obtain powders of coarse, medium and fine fineness, and weigh the mass ratio of the three fineness powders, so that The mass ratio of the three fineness powders just reaches the mass ratio of calcium hydroxide, magnesium hydroxide and aluminum hydroxide, then the finest powder is calcium hydr...

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PUM

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Abstract

The invention provides a method for preparing calcium hydroxide, magnesium hydroxide and aluminum hydroxide by using mixed hydroxide obtained from chromium slag treatment, washing, drying and pulverizing the mixed hydroxide obtained from chromium slag treatment to obtain fine powder Then use an automatic winnowing machine to separate powders of three different weights; select one of the above three weights of powders to sieve through the screen to obtain coarse, medium and fine powders, and weigh the powders The mass ratio of the three fineness powders is such that the mass ratio of the three fineness powders just reaches the mass ratio of calcium hydroxide, magnesium hydroxide and aluminum hydroxide, and the finest powder has the highest density. Calcium hydroxide, the thickest powder is magnesium hydroxide with the smallest density, and the remaining medium-fine powder is aluminum hydroxide.

Description

technical field [0001] The invention relates to the technical field of treatment and utilization of inorganic chemical waste chromium slag, in particular to a method for preparing calcium hydroxide, magnesium hydroxide and aluminum hydroxide with mixed hydroxide, wherein the mixed hydroxide is a mixture obtained from treating chromium slag. hydroxide. Background technique [0002] Chromium slag refers to the residue of sodium dichromate leached with water after chromite ore is roasted during the production process of sodium dichromate. Due to different raw materials, production processes and formulas, the composition of chromium slag is different. Its basic composition and percentage of ingredients are as follows: the mass percentage of dichromium trioxide is 2.5-4%, and the mass percentage of water-soluble hexavalent chromium is 0.28-1.34 %, the mass percentage of acid-soluble hexavalent chromium is 0.9-1.4%, the mass percentage of calcium oxide is 29-36%, the mass percent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/00C01G51/08C01F11/02C01F5/14C01F7/02B09B3/00
CPCY02W30/82
Inventor 王嘉兴
Owner 王嘉兴