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Process for preparing Cr2O3 from waste dregs of chromium hydroxide

A technology of chromium trioxide and chromium hydroxide is applied in the field of waste water treatment and chrome-plating waste residue, which can solve the problems of difficulty in popularization and use, low product value and high treatment cost, and achieves the advantages of convenient operation, quick effect and simple treatment process. Effect

Inactive Publication Date: 2004-03-17
周磊韶 +1
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the treatment process of chromium hydroxide waste residue has also been reported in China, but these processes are seldom used. The main reason is that the process is complicated, the treatment cost is high, and the product value is low. So it is difficult to promote the use of

Method used

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Embodiment 1

[0012] The present invention utilizes chromium hydroxide waste residue to produce the method for dichromium trioxide, comprises the following steps:

[0013] (1) Use the sun to dry the waste residue or dry it in an oven, and send it to the mixing room for use;

[0014] (2) take dry waste residue, add treating agent in proportion, treating agent is hexavalent chromium waste water and sulfur powder, and its feeding ratio is 100kg chromium hydroxide: 20 liters of Baume degrees are the hexavalent chromium waste water of 30 degrees: 7kg Sulfur powder, after being stirred evenly, is sent into the vulcanization furnace;

[0015] (3) Cover the material sent into the vulcanization furnace, seal the top of the furnace with mud, and leave a small air outlet, then put in coal in proportion, the amount of coal is 40% of the amount of raw material, ignite and heat Above 800 ℃, after the fuel is burned out, it will be released;

[0016] (4) The material after being discharged from the furn...

Embodiment 2

[0019] The present invention utilizes chromium hydroxide waste residue to produce the method for dichromium trioxide, comprises the following steps:

[0020] (1) Use the sun to dry the waste residue or dry it in an oven, and send it to the mixing room for use;

[0021] (2) take dry waste residue, add treatment agent in proportion, treatment agent is sulfur powder, and its feeding ratio is 100kg chromium hydroxide: 5kg sulfur powder, send into vulcanization furnace after stirring;

[0022] (3) Cover the material sent into the vulcanization furnace, seal the top of the furnace with mud, and leave a small air outlet, then put in coal in proportion, the amount of coal is 50% of the amount of raw material, ignite and heat Above 1000°C, after the fuel is burned out, it will be released from the furnace;

[0023] (4) The material after being discharged from the furnace is sent to the cooling bed for cooling, and after the material after cooling turns green completely, the crude prod...

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Abstract

A process for preparing Cr2O3 from waste chromium hydroxide dregs includes such steps as drying the said waste dregs, proportionally mixing it with treating agent, stirring to uniformity, loading in sulfurizer, proportionally adding fuel coal, combustion, and cooling. Its advantages are simple process, low investment, quick effect, and low technical requirement.

Description

Technical field [0001] The invention relates to a treatment method for chromium plating waste residue and waste water, in particular to a method for producing chromium trioxide by using chromium hydroxide waste residue. Background technique [0002] At present, in domestic electroplating plants, the following two methods are basically used for the treatment of chromium-containing wastewater: one is chemical precipitation, and the other is resin column filtration. However, there are defects in these two methods. One is to deposit waste residue by chemical method, which needs to occupy a large amount of land for storage, and after being eroded and washed by acid rain, it will also cause environmental pollution; Although the waste liquid produced in the filter can be used to recover sodium dichromate, there are secondary pollutants in the recovery process. Therefore a very important point is the treatment of chromium hydroxide residue after the treatment of chromium-containing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/37A62D101/43C01G37/033
Inventor 周磊韶周磊明
Owner 周磊韶
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