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Method for dissolving poison solidified chromium slag

A technology for chromium slag and blast furnace slag is applied in the field of chromium slag detoxification and integrated detoxification and solidification of chromium slag.

Active Publication Date: 2015-08-19
沃德费默循环经济科技发展(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the use of Portland cement to solidify chromium slag has also been studied at home and abroad. Although the cement solidification method has simple process equipment, wide sources of materials, low prices, and low equipment operating costs, the cement solidification method also has many problems that cannot be ignored.

Method used

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  • Method for dissolving poison solidified chromium slag
  • Method for dissolving poison solidified chromium slag
  • Method for dissolving poison solidified chromium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Different mass parts of embodiment 1 influence on solidification

[0021] Dry and refine the chromium slag and blast furnace slag. After refinement, the particle size of the chromium slag and blast furnace slag is 200 mesh. Sodium hydroxide and water glass are mixed with a mass ratio of 1:1.5 to make a composite activator. Sodium sulfide and sulfurous acid Iron is mixed at a mass ratio of 1:1 to make a composite reducing agent. In terms of parts by mass (38 parts, 57 parts, 3 parts, 2 parts), (45 parts, 45 parts, 6 parts, 4 parts), (51 parts, 34 parts, 9 parts, 6 parts) respectively take the above refinement The final chromium slag, blast furnace slag, composite activator, and composite reducing agent are mixed, and then water is added at a liquid-solid mass ratio of 0.25:1 and stirred evenly, and then sequentially molded, solidified, and demoulded, and heated at a temperature of 25°C and a relative humidity of 90°C. Under the condition of more than %, carry out mainte...

Embodiment 2

[0025] The impact of the different mass ratios of sodium hydroxide and water glass on the curing effect in the composite activator of embodiment 2

[0026] Dry and refine the chromium slag and blast furnace slag. After refining, the particle size of the chromium slag and blast furnace slag is 200 mesh. Mix sodium hydroxide and water glass at a mass ratio of 1:1.5, 1:2.3, and 1:4 respectively to make a composite As an activator, sodium sulfide and ferrous sulfate are mixed at a mass ratio of 1:1 to make a composite reducing agent. Take 38 parts of refined chromium slag, 57 parts of blast furnace slag, 3 parts of composite activator, and 2 parts of composite reductant, mix them, then add water at a liquid-solid mass ratio of 0.25:1 and stir evenly, then pour into the mold, solidify, Demoulding and curing for 28 days at a temperature of 25°C and a relative humidity of 90% or more to obtain solidified bodies of detoxified and solidified chromium slag. The preparation steps are as ...

Embodiment 3

[0030] The influence of embodiment 3 different liquid-solid ratios on solidification

[0031] Dry and refine the chromium slag and blast furnace slag. After refining, the particle size of the chromium slag and blast furnace slag is 200 mesh. Mix sodium hydroxide and water glass at a mass ratio of 1:2.3 to make a composite activator, and mix sodium sulfide and sulfuric acid Ferrous iron is mixed at a mass ratio of 1:1 to make a composite reducing agent. Take 38 parts of refined chromium slag, 57 parts of blast furnace slag, 3 parts of composite activator, and 2 parts of composite reductant, mix them, then add water at a liquid-solid mass ratio of 0.23:1, 0.25:1, 0.27:1 and stir evenly , and then sequentially molded, solidified, demoulded and maintained at a temperature of 25°C and a relative humidity of 90% or more for 28 days to obtain cured bodies of detoxified and cured chromium slag. The preparation steps are as follows: figure 1 . According to GB / T17671-1999 "Cement mort...

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Abstract

The invention discloses a method for dissolving poison solidified chromium slag. Firstly chromium slag and blast-furnace slag are fetched to be dried and refined. A composite catalyst is made by mixing sodium hydroxide and sodium silicate according to weight ratio of 1: 1.5 to 4. A compounding reducing agent is made by mixing sodium sulfide and ferrous sulfate according to weight ratio of 1:1. According to weight, 34 to 57 portions of refined blast-furnace slag, 34 to 57 portions of chromium slag, 3 to 9 portions of composite catalyst and 2 to 6 portions of compounding reducing agent are mixed, then water is added according to the quality of liquid-solid ratio of 0.23 to 0.27 : 1. And the blast-furnace slag, the chromium slag, the composite catalyst and the compounding reducing agent are evenly stirred. The solidified body of dissolving poison solidified chromium slag is finished after molding, solidifying, removing molding and maintaining. The solidified body prepared by the method has good mechanical property. Not only is the environment problem produced by storing the blast-furnace slag remitted, but also the leaching of chromium ion in the chromium slag is effectively prevented.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization and harmless treatment of slag resources, and relates to a chromium slag detoxification method, in particular to an integrated detoxification and solidification chromium slag method. Background technique [0002] Chromium slag is an industrial solid waste produced during the production of metal chromium and chromium salts in the chemical and metallurgical departments. It is made by adding soda ash, dolomite and limestone to chromite ore and roasting at a high temperature of 1100-1200 ° C. Solid waste residue left after salting. Usually, in the production of chromium salt in my country, 2-3 tons of chromium residue will be discharged for every 1 ton of chromium salt produced, and about 7 tons of chromium residue will be discharged for every lt of metal chromium produced. t, the amount of chromium slag stockpiled over the years has exceeded 3 million tons. The accumulation of chromium slag ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/08B09B3/00
Inventor 李东伟黄萧李杉黄涛
Owner 沃德费默循环经济科技发展(北京)有限公司
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