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Method for removing and recycling chrome from acid chromate wastewater in one step

A chromium wastewater, acid technology, applied in the fields of energy wastewater treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of toxic operation, large consumption of reagents, complicated operation, etc. Damage, easy to operate effect

Inactive Publication Date: 2013-11-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is an ingestion poison / inhalation extremely poison, skin contact may cause sensitivity; it is more likely to cause hereditary gene defects, inhalation may cause cancer, and has persistent danger to the environment
But this method has adopted organic solvent, has certain toxicity, and cost is higher, is unfavorable for industrialized production
[0010] The existing technologies have problems such as complicated operation, high energy consumption / reagent consumption, high cost, toxic operation, and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 15mL of chromium-containing industrial wastewater, wherein the concentration of Cr(IV) is 200mg / L, the acidity is pH 3.5, mixed with Cu 2+ and Fe 3+ Wait for impurity metal ions, add 3g ammonium sulfate and 3g polyethylene glycol 2000, vortex dissolve and mix, then separate phases, the extraction rate of polymer relative to hexavalent chromium is 90%. The upper phase of the polymer was left to stand for 3 days, and the phases were separated. The recovery rate of trivalent chromium in the lower phase was 86%.

Embodiment 2

[0036] Get 90g of chromium-containing industrial wastewater, wherein, Cr (IV) concentration is 1mg / L, acidity is pH 6, mixed with Cu 2+ and Fe 3+ Wait for impurity metal ions, add 5g sodium sulfate and 5g polyether 50-HB-170, vortex dissolve and mix, then separate phases, the extraction rate of the polymer relative to hexavalent chromium is 95%. The upper phase of the polymer was left to stand for 4 days under a fluorescent lamp, and the phases were separated. The recovery rate of trivalent chromium in the lower phase was 92%.

Embodiment 3

[0038] Get 15g of chromium-containing industrial wastewater, wherein, the Cr(IV) concentration is 400mg / L, the acidity is pH 1, mixed with Cu 2+ and Fe 3+ Wait for impurity metal ions, add 5g sodium phosphate and 80g polyethylene glycol 2000, vortex dissolve and mix, then separate phases, the extraction rate of the polymer relative to hexavalent chromium is 90%. The upper phase of the polymer was left to stand at 40° C. for 2 days, and the phases were separated. The recovery rate of trivalent chromium in the lower phase was 86%.

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PUM

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Abstract

The invention relates to a method for removing and recycling chrome from acid chromate wastewater in one step, which comprises the steps that: (1) phase-forming salt and polymer are added into acid chromate wastewater for forming two aqueous phases; (2) a yellow polymer phase which carries hexavalent chromium is obtained after separation and is placed, under the action of light or / and the outside environment, an aqueous phase layer is separated out from the lower layer of the yellow polymer phase, phase separation is carried out, and accordingly, trivalent chromium is recycled from the wastewater. Compared with the prior art, the invention has the advantages that: (1) the acid and alkali consumption problem does not exist, organic solvent is not needed to be added as well, so the cost is reduced; (2) the method is simple to operate and has less energy consumption, and industrial production is easy to realize; and (3) the method does not adopt the organic solvent, is green and non-toxic, and the damage to a human body of an operator and the pollution to the environment can be reduced to the maximum extent.

Description

technical field [0001] The invention relates to the fields of environmental treatment and recycling of metal resources, and relates to a method for removing and recovering chromium from acidic chromium-containing wastewater. Background technique [0002] Chromium-containing wastewater mainly comes from industrial pollution, especially the electroplating industry. Due to the advantages of high hardness, heat resistance, wear resistance, corrosion resistance, brightness and beauty, the combined chromium coating has a wide range of applications. The source of electroplating chromium-containing wastewater is generally the cleaning of plating parts and electroplating waste liquid. Among them, the washing water of plating parts is the main source of chromium-containing wastewater in electroplating, accounting for more than 80% of the discharge of chromium-containing wastewater. [0003] Chromium pollution has serious harm to the ecological environment and human health, and hexav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/62C02F1/26C22B7/00C22B34/32
CPCY02P10/20Y02W10/37
Inventor 赵君梅王福春刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI