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Process for detoxicating chrome slag by sulfur

A technology of sulfur and chromium slag, applied in the direction of chemical instruments and methods, chromium compounds, solid waste removal, etc., can solve problems such as hexavalent chromium pollution, inability to completely restore hexavalent chromium, poor reduction conditions, etc. The effect of secondary pollution

Inactive Publication Date: 2006-06-28
四川安县银河建化集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the defects in the process of the above method, the reduction conditions are not good, and the reducing agent is insufficient, the hexavalent chromium cannot be completely reduced, and the reduced chromium slag is easy to turn yellow, causing the hexavalent chromium to be polluted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] a. Put 30kg of chromium slag and 70kg of sulfur with a fineness of 5mm into the boiling furnace for roasting. The temperature of the boiling furnace is controlled at 700-800°C.

[0013] b. Test results of chromium slag after detoxification: There is no hexavalent chromium in the detoxified chromium slag, and the total chromium content in the tail gas is zero.

Embodiment 2

[0015] a. Put 40kg of chromium slag and 60kg of sulfur with a fineness of 5mm into the boiling furnace for roasting. The temperature of the boiling furnace is controlled at 700-800°C.

[0016] b. Test results of chromium slag after detoxification: There is no hexavalent chromium in the detoxified chromium slag, and the total chromium content in the tail gas is zero.

Embodiment 3

[0018] a. Put 60kg of chromium slag and 40kg of sulfur with a fineness of 5mm into the boiling furnace for roasting. The temperature of the boiling furnace is controlled at 700-800°C.

[0019] b. Test results of chromium slag after detoxification: There is no hexavalent chromium in the detoxified chromium slag, and the total chromium content in the tail gas is zero.

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PUM

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Abstract

A process for detoxicating Cr slag by sulfur includes such steps as mixing Cr slag with sulfur in boiling furnace, calcining at 500-1000 deg.C for generating SO2, using SO2 to reduce Cr slag for removing water-soluble Cr and acid-soluble Cr, using the residual dreg to produce cement, and using the tail gas to prepare sulfuric acid.

Description

technical field [0001] The invention relates to a method for detoxifying chromium slag by using sulfur, in particular a method for detoxifying water-soluble hexavalent and water-insoluble calcium chromate in chromium slag after mixing sulfur and chromium slag into a fluidized furnace for roasting. Background technique [0002] Most of the chromium salt production today is roasted with calcium fillers, such as dolomite, limestone mixed with chromite, soda ash and some chromium slag. This process produces a large amount of chromium slag. 2 to 2.5 tons. Since chromium slag contains hexavalent chromium, up to 2 to 3% (calculated as chromium trioxide), and chromium slag contains water-insoluble calcium chromate, which is a carcinogen, so a large amount of chromium slag is discarded or utilized, such as If the toxins (water-soluble hexavalent chromium and water-insoluble calcium chromate) are not removed, it will cause great threat and damage to human beings and the environment. ...

Claims

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Application Information

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IPC IPC(8): B09B3/00C01G37/00
Inventor 李先荣张国庆马顺友王亭刚胡义华
Owner 四川安县银河建化集团有限公司