Method for preparing orange chrome yellow pigment by recycling Cr<6+> from chromium residues

A technology of orange chrome yellow and pigment, which is applied in the field of resource utilization of hazardous solid waste chromium slag, and can solve the problem of secondary pollution of wastewater

Inactive Publication Date: 2012-01-25
JIANGNAN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to realize the resource utilization of chromium slag, utilize the hexavalent chromium that exists in the chromium slag to develop and utilize, produce orange chrome yellow pigment, solve the Pb produced in the preparation process simultaneously 2+ Secondary pollution of wastewater

Method used

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  • Method for preparing orange chrome yellow pigment by recycling Cr&lt;6+&gt; from chromium residues
  • Method for preparing orange chrome yellow pigment by recycling Cr&lt;6+&gt; from chromium residues
  • Method for preparing orange chrome yellow pigment by recycling Cr&lt;6+&gt; from chromium residues

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example 1

[0016] Taking the waste chromium slag of a factory as the research object, the leaching experiment was carried out to obtain Cr 6+ The concentration is 5.1g / L, pH=3.1, take 1L of Cr-containing 6+ Leaching water, according to weight ratio, lead acetate: Cr 6+ : caustic soda=24:10:1, at room temperature (22° C.), stirred and reacted for 10 minutes to form orange chrome yellow pigment suspension, which was filtered, aged, rinsed and dried to form orange chrome yellow product. Cr in filtered wastewater 6+ The concentration is 0.31mg / L, Pb 2+ The concentration is 2.1mg / L, Cr 6+ The effective recovery rate is 99.99%, including Cr 6+ The wastewater meets the effluent standard, and the Pb-containing 2+ Add rectorite to the wastewater, the pH is 5.6, the reaction time is 90min, the ratio of rectorite dosage to water is 15g / L, Pb 2+ Concentration dropped from 2.1mg / L to 0.04mg / L, Pb 2+ The removal rate reaches 98.1%. This kind of lead-containing wastewater meets the first-level s...

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Abstract

The invention relates to a method for preparing orange chrome yellow and effectively controlling secondary pollution in the resource utilization of chromium residues which are dangerous solid wastes. The method comprises the following steps of: mixing the effective Cr<6+> obtained from the chromium residues with a proper amount of solution consisting of lead acetate solution and caustic soda; heating and continuously stirring the mixture, wherein after 5-30 minutes of reaction, a suspension of the orange chrome yellow pigment is formed; and filtering, aging, rinsing and drying to obtain the orange chrome yellow pigment. The indexes of the orange chrome yellow pigment produced by the method meet the state product standard for orange chrome yellow pigment (GB / T3184-93). Meanwhile, a certain amount of rectorite is added into the waste water containing Pb<2+> produced in the preparation of the orange chrome yellow pigment, so that the concentration of Pb<2+> in the waste water can meet the comprehensive discharge first-level standard.

Description

technical field [0001] The invention relates to a method for resource utilization of hazardous solid waste chromium slag. Background technique [0002] With the improvement of people's living standards, chromium and its compounds are widely used in many industrial sectors such as metallurgy, electroplating, papermaking, printing and dyeing, and leather tanning. The rapid development of the chromium salt industry has solved the problem of a large demand for chromium salts to a certain extent. In fact, a large amount of chromium slag solid waste is often discharged in the production process of chromium salt, and about 3 to 4 tons of chromium-containing waste slag will be discharged for every 1 ton of sodium dichromate produced. The content of hexavalent chromium in the waste residue is very high, and the great harm of hexavalent chromium has brought a serious threat to people's life and production. Contents of the invention [0003] The purpose of the present invention is ...

Claims

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Application Information

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IPC IPC(8): C01G37/14
Inventor 詹旭邹路易张光生邹华顾维娣丁菲涂凯
Owner JIANGNAN UNIV
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