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Method and process for recovering chromium from chromium residue by chlorination segregation method

A technology of chromium slag and disposal method, applied in the direction of chromium halide, climate sustainability, sustainable waste treatment, etc., can solve problems such as secondary pollution, achieve the advantages of less equipment investment, good promotion and application prospects, and solving secondary pollution. Effect

Inactive Publication Date: 2010-06-23
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) Purpose: the purpose of the present invention is to provide a method and process for fully enriching the chromium in the chromium slag to make it a resource, and to solve the problem of secondary pollution that is generally used in industries such as building materials after reduction and detoxification.

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  • Method and process for recovering chromium from chromium residue by chlorination segregation method

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Effect test

Embodiment 1

[0025] Grind 500g of chromium slag and 20g of coal to 80 mesh respectively, mix thoroughly, add 20mL of calcium chloride and 10mL of 3% polyvinyl alcohol aqueous solution, mix evenly, and then granulate to form particles with a diameter of 4mm and a length of 10mm. Transfer to the tubular roaster, after roasting at 980°C for 50 minutes, the gas out of the roaster was absorbed with water to obtain 500 mL of chromium trichloride aqueous solution; 493.1 g of slag was obtained. The total chromium content of the slag was less than 5 ppm (hexavalent chromium content below 1ppm).

Embodiment 2

[0027] Grind 500g of chromium slag and 20g of coal to 80 mesh respectively, mix thoroughly, add 20mL of calcium chloride and 10mL of 3% polyvinyl alcohol aqueous solution, mix evenly, and then granulate to form particles with a diameter of 4mm and a length of 10mm. Transfer to the tubular roaster, after roasting at 980°C for 80 minutes, absorb the gas out of the roaster with water to obtain 500 mL of chromium trichloride aqueous solution; obtain 492.5 g of slag. The total chromium content of the slag is 4.2 ppm (hexavalent chromium content below 1ppm).

Embodiment 3

[0029] Grind 500g of chromium slag and 20g of coal to 80 mesh respectively, mix thoroughly, add 20mL of calcium chloride and 10mL of 3% polyvinyl alcohol aqueous solution, mix evenly, and then granulate to form particles with a diameter of 4mm and a length of 10mm. Transfer to the tubular roaster, after roasting at 980°C for 90 minutes, absorb the gas out of the roaster with water to obtain 500 mL of chromium trichloride aqueous solution; obtain 492.4 g of slag. The total chromium content of the slag is 4.1 ppm (hexavalent Chromium content is less than 1ppm).

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Abstract

The invention relates to a method for industrial waste residue resource disposal, in particular to a process for enriching and recovering chromium in the chromium residue by a chlorination segregation method. The concrete method comprises the following steps: the pulverized coal and chromium residue are respectively ground to 80 meshes, evenly mixed and then added with 10 percent of calcium chloride aqueous solution and 3 percent of polyvinyl alcohol aqueous solution to be sufficiently and evenly mixed, and then the mixed solution is molded by extrusion; then the mixed solution is transferred to a roasting furnace to be roasted for 80 minutes at the temperature of 980 DEG C, the gas discharged at the top of the roasting furnace is absorbed through water circulation to obtain chromium trichloride solution; the chromium trichloride solution can be used for producing chromium trichloride or other chromium salts; the overall content of chromium in the chromium residue discharged from the roasting furnace is lower than 5 ppm (the content of hexavalent chromium is lower than 1 ppm), and the chromium can be used as building material; the separation and the concentration of chromium are realized through the method, the chromium recovery ratio is up to 94 percent, the chromium residue is recycled, and the problem of secondary pollution existing in the chromium residue is solved. The method is simple in process, requires low equipment investment, is suitable for volume production and convenient for industrialization; and the method is an environment-friendly process which has better popularization and application prospect.

Description

technical field [0001] The invention belongs to an industrial waste slag resource disposal method, in particular to a process for enriching and recycling chromium in chromium slag by means of chlorination and segregation. Background technique [0002] Chromium slag is the waste slag discharged from the production of chromium salts and metal chromium products. It can cause various diseases and is also a carcinogen that causes various cancers. The nascent toxic slag containing chromium, together with the accumulated chromium slag accumulated over the years, is not less than 30 million tons. Nearly 50 chromium salt production enterprises in the country have stockpiled tens of millions of tons of chromium slag, and the annual increase is more than one million tons. If it is not effectively controlled, it will cause serious damage to the ecological environment of the country and cause serious harm to the health of the people. [0003] At present, the chromium slag detoxification...

Claims

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Application Information

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IPC IPC(8): C01G37/04C04B18/30
CPCY02W30/91
Inventor 廖辉伟戴亚堂童云李洪波黄涛穆兰郑敏孟艳艳
Owner SOUTHWEAT UNIV OF SCI & TECH
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