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Process for integrally reducing solidified chromium slag

A chromium slag and process technology, which is applied in the field of processing non-ore raw materials, can solve the problems of poor anti-leaching performance, high cost, and increased waste volume, and achieve the effects of short curing time, large amount of slag, and no secondary pollution

Inactive Publication Date: 2014-03-19
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can temporarily seal up the chromium slag, due to the poor leaching resistance of the conventional solidified body (Han Huaifen, Jin Mantong et al. found that when the chromium slag was stabilized with cement binders, when pure cement solidified the chromium slag , when the amount of chromium slag added reaches 30%, the leaching toxicity will exceed the standard), must be coated, the cost is high, and the volume after curing and sealing is about 1.5 to 2.0 times the volume of chromium slag, increasing the volume of waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The process of integrated reduction and solidification of chromium slag in this embodiment comprises the following steps:

[0022] 1) The chromium slag was taken and dried and refined; the grain size of the chromium slag after refinement in this embodiment was 120 mesh.

[0023] 2) By mass, take 19.6 parts of aluminum powder, 49 parts of oxidizing agent, and 31 parts of chromium slag refined in step 1) and mix them evenly; the oxidizing agent selected in this embodiment is Fe 2 o 3 .

[0024] 3) Fill the mixture in step 2) into the reaction vessel and compact it lightly;

[0025] 4) Use a magnesium strip to ignite the mixture in step 2) for reduction and solidification reactions.

Embodiment 2

[0027] The process of integrated reduction and solidification of chromium slag in this embodiment comprises the following steps:

[0028] 1) The chromium slag was taken and dried and refined; the particle size of the chromium slag after refinement in this embodiment was 70 mesh.

[0029] 2) By mass, take 17.7 parts of aluminum powder, 40 parts of oxidizing agent, and 42.4 parts of chromium slag refined in step 1) and mix them evenly; the oxidizing agent selected in this embodiment is Fe 2 o 3 .

[0030] 3) Fill the mixture in step 2) into the reaction vessel and compact it lightly;

[0031] 4) Use the magnesium tape as an igniter to ignite the mixture in step 2) for reduction and solidification reactions.

Embodiment 3

[0033] The process of integrated reduction and solidification of chromium slag in this embodiment comprises the following steps:

[0034] 1) The chromium slag was taken and dried and refined; the particle size of the chromium slag after refinement in this embodiment was 200 mesh.

[0035] 2) By mass, take 17 parts of aluminum powder, 42 parts of oxidizing agent, and 40 parts of chromium slag refined in step 1) and mix them evenly; the oxidizing agent selected in this embodiment is Fe 2 o 3 .

[0036] 3) Fill the mixture in step 2) into the reaction vessel and compact it lightly;

[0037] 4) Use a magnesium strip to ignite the mixture in step 2) for reduction and solidification reactions.

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Abstract

The invention discloses a process for integrally reducing solidified chromium slag, which comprises the following steps: firstly drying and refining chromium slag, uniformly mixing 15-20 parts of aluminum powder, 35-50 parts of oxidant and 30-45 parts of refined chromium slag, filling the mixture in a reactor, igniting to perform the solidifying reaction. Based on the thermit reaction, hexavalent chromium can be reduced as trivalent chromium with small toxicity, and the trivalent chromium can be fixed in lattice of a spinel to prevent the trivalent chromium from re-oxidizing as the hexavalent chromium, the extraction amount of the finally obtained solidified substance can achieve 10<-7>-10<-8> order of magnitude so as to completely detoxify the chromium slag. Furthermore, the process has the advantages of being energy-saving, large in slag-detoxifying amount and simple.

Description

technical field [0001] The invention belongs to the field of processing non-ore raw materials, and relates to a chromium slag detoxification process, in particular to an integrated reduction and solidification chromium slag process. Background technique [0002] Chromium slag is a kind of alkaline yellow-green granular sintered solid, which is a solid waste produced in the production process of chromium salt production plants and ferrochrome alloy plants. At present, the discharge of chromium slag is huge. Every time a manufacturer produces 1 ton of chromium salt, it can produce 3-5 tons of chromium slag, and every time it produces 1 ton of metal chromium, it will discharge 7 tons of chromium slag. [0003] Chromium slag contains a large amount of hexavalent chromium ions, which is extremely toxic. It is a carcinogen announced by the International Anti-Cancer Research Center and the American Toxicology Organization. It is also a hazardous waste clearly stipulated in my count...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D3/38A62D101/43
Inventor 徐中慧谭钦文肖博吴丹丹彭熙郑磊
Owner SOUTHWEAT UNIV OF SCI & TECH
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