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Detoxification method of chromium slag in production of sulfuric acid

A technology for sulfuric acid production and chromium slag, applied in chemical instruments and methods, removal of sulfur compounds and solid wastes, etc., can solve the problems of hexavalent chromium pollution, poor reduction conditions, easy yellowing of chromium slag, etc. The effect of secondary pollution

Inactive Publication Date: 2006-07-12
SICHUAN YINHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the technical defects of the above two methods, 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

[0009] Embodiment 1: a kind of method to chromium slag detoxification in sulfuric acid production, chromium slag ore is pulverized to 80 order, adds chromium slag and mixes by the ratio of 5% (percentage by weight) of pyrite, enters roasting in φ 5m fluidized furnace, Control the temperature in the furnace to be 700-800°C, and control the feeding rate to be 5 tons / hour. After testing, there is no hexavalent chromium and acid solution in the sulfuric acid slag, no hexavalent chromium in the sulfuric acid, no hexavalent chromium in the wastewater, and the water-insoluble trivalent chromium in the sulfuric acid is 0.4ppm.

Embodiment 2

[0010] Embodiment 2: Chromium slag is pulverized to 100 orders, adds chromium slag and mixes by pyrite 8% (percentage by weight), enters roasting in the phi 6m fluidized furnace, and the temperature in the control furnace is 800-900 ℃, and the control feed rate is 5.5 tons / hour. After testing, there is no hexavalent chromium and acid solution in the sulfuric acid slag, no hexavalent chromium in the wastewater, and the water-insoluble trivalent chromium in sulfuric acid is 0.5ppm.

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PUM

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Abstract

The invention relates to a detoxification method of chromic slag in the process of producing vitriol with ebullition furnace. It mixes the chromic slag and ferro-sulphur ore as raw material to be baked in the ebullition furnace while the baking temperature is controlled between 600-900Deg. C, and the mixing weight rate between ferro-sulphur ore and chromic slag is 100:0.1-300. In the baking process, the sulfur dioxide generated by ferro-sulphur ore can fully deoxidize the hexavalent chromium of chromic slag to remove the toxin (water soluble chromium and acid soluble chromium) in the chromic slag. The invention can realize detoxification of chromic slag without affecting the production and quality of vitriol, and the generated vitriol slag can be used as cement mixing material to avoid secondary pollution.

Description

Technical field: [0001] The invention is a method for detoxifying chromium slag in the production of sulfuric acid, in particular a method for detoxifying water-soluble hexavalent chromium and water-insoluble calcium chromate in chromium slag in the production of sulfuric acid by using a boiling furnace. Background technique: [0002] Most of the present chromium salt production is roasted with calcareous fillers, such as limestone, dolomite, chromite, soda ash and some chromium slag mixed powder. Chromium slag 2-2.5 tons. Since the chromium residue contains hexavalent chromium, up to 2-3% (chromium trioxide juice), and the chromium residue contains water-insoluble calcium chromate, which is a carcinogen, so whether a large amount of chromium residue is discarded or utilized, 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. At present, there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C01B17/74
Inventor 李先荣马顺友张国庆胡义华
Owner SICHUAN YINHE CHEM