Novel process of the high temperature reduction and detoxication of industrial chromic slag

A technology of industrial waste residue and chromium residue, which is applied in the direction of protection devices against harmful chemicals, can solve problems such as immature technology, and achieve the effects of simple equipment, promotion of chemical reactions, and large physical heat capacity

Inactive Publication Date: 2008-03-12
隋智通
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The biological method is to use microbial strains to reduce chromate in chromium slag to reduce Cr(VI) to Cr(III). This is a new method for chromium slag detoxification in recent years, but the technology is immature and still in research phase

Method used

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  • Novel process of the high temperature reduction and detoxication of industrial chromic slag
  • Novel process of the high temperature reduction and detoxication of industrial chromic slag
  • Novel process of the high temperature reduction and detoxication of industrial chromic slag

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Experimental program
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Effect test

Embodiment approach (1

[0026] A certain amount of reducing metallurgical slag is weighed and filled in a slag pot, heated and melted, and the temperature after melting is controlled at 1200°C. When the temperature is constant, add chromium slag to the slag tank, and the water-soluble sodium chromate (Na 2 CrO 4 ) and acid-soluble calcium chromate (CaCrO 4 ) content are 0.5% and 0.2% respectively, the particle size of chromium slag is controlled below 20 mesh, the addition amount is 2% of the total amount of metallurgical slag, the reaction time is controlled at 5min, and naturally cooled to room temperature, in the obtained final slag, Cr(VI ) removal rate of 99.93% of the final slag.

Embodiment approach (2

[0028] A certain amount of reducing metallurgical slag is weighed and filled in a slag pot, heated and melted, and the temperature after melting is controlled at 1200°C. When the temperature is constant, add chromium slag to the slag tank, and the water-soluble sodium chromate (Na 2 CrO 4 ) and acid-soluble calcium chromate (CaCrO 4 ) content is 0.5% and 0.2% respectively, the particle size of chromium slag is controlled below 20 mesh, the addition amount is 2% of the total amount of metallurgical slag, the reaction time is controlled at 15min, and naturally cooled to room temperature, in the obtained final slag, Cr(VI ) removal rate of 99.95% of the final slag.

Embodiment approach (3

[0030] A certain amount of reducing metallurgical slag is weighed and filled in a slag pot, heated and melted, and the temperature after melting is controlled at 1200°C. When the temperature is constant, add chromium slag to the slag tank, and the water-soluble sodium chromate (Na 2 CrO 4 ) and acid-soluble calcium chromate (CaCrO 4 ) content is 0.5% and 0.2% respectively, the particle size of chromium slag is controlled below 20 mesh, the addition amount is 6% of the total amount of metallurgical slag, the reaction time is controlled at 5min, and naturally cooled to room temperature, in the obtained final slag, Cr(VI ) removal rate of 99.91% of the final slag.

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Abstract

The present invention relates to a method for reducing detoxification of chromium residue under a high temperature with industrial wastes. Reducing metallurgy wastes in a waste tank are heated and melted. When the temperature becomes constant, the chromium residue is added into the tank. The toxicant in the chromium residue is Cr6 mainly in the form of water-soluble Na (SUB)2( / SUB)CrO (SUB)4 ( / SUB) and acid-soluble CaCrO (SUB)4( / SUB). Under the high temperature, Cr6 is reduced into intoxicant Cr3. After the chromium residue is cooled down to the room temperature naturally, the removal rate of Cr6 reaches over 99 percent in the final residue. The method is provided with an appropriate process flow, and the device is simple and easy for operation. Heat of the material itself is fully used, so the high efficiency is high, which is beneficial to the high-temperature reducing of chromium residue. The chromium residue is thoroughly detoxicated. Moreover, no environmental pollution is caused and the cost is low, so the method is applicable for scaled detoxification of chromium residue in the industry.

Description

1. Technical field [0001] The invention relates to a treatment process for detoxifying chromium slag, in particular to a method for reducing and detoxifying chromium slag by utilizing industrial waste residue at high temperature. 2. Background technology [0002] Chromium slag is a waste discharged during the production of chromium salts or ferrochrome alloys, and is one of the three recognized carcinogens. At present, the detoxification and disposal of chromium slag is a key issue restricting the sustainable development of my country's chromium salt and ferrochrome industry, and it is also an important technical problem that has not been solved reasonably and effectively. [0003] The detoxification and disposal technologies of chromium slag at home and abroad can be summarized into the following four main methods: solidification method, reduction method, complexation method and biological method. [0004] The solidification method uses physical or chemical methods to fix ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/00
Inventor 隋智通石玉敏都兴红
Owner 隋智通
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