Treatment method of separating and recycling copper, iron, zinc, nickle and chromium from chromium-containing sludge

A treatment method and separation and recovery technology, which are applied to the separation and recovery of copper, iron, zinc, and chromium from chromium-containing sludge, and nickel fields, can solve the problems of cumbersome steps and high requirements for supporting facilities, and reduce the content of chromium elements. , good pollution control and resource recovery, the effect of reducing production

Active Publication Date: 2020-06-19
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is a dry method-wet method-dry method, and the chromium calcined later still needs to be separated by wet method, the steps are cumbersome, and the requirements for supporting facilities are relatively high

Method used

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  • Treatment method of separating and recycling copper, iron, zinc, nickle and chromium from chromium-containing sludge
  • Treatment method of separating and recycling copper, iron, zinc, nickle and chromium from chromium-containing sludge
  • Treatment method of separating and recycling copper, iron, zinc, nickle and chromium from chromium-containing sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The chromium-containing sludge in a factory area contains 20% chromium, 10% zinc, 5% Cu, 1% Fe, and 1% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 10%, and the amount of acid added is 400g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 37 mg / m 3 , 4.8g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 49mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 10% sodium hydroxide to the solution to adjust the pH value to 9, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 11, heat a...

Embodiment 2

[0044] The chromium-containing sludge in a factory area contains 15% chromium, 3% zinc, 6% Cu, 2% Fe and 2% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 40%, and the amount of acid added is 100g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 42mg / m 3 , 5.9g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 21mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 10% sodium hydroxide to the solution to adjust the pH value to 10, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 12, heat at ...

Embodiment 3

[0049] The chromium-containing sludge in a factory area contains 5% chromium, 18% zinc, 4% Cu, 1% Fe, and 1% Ni. Add sulfuric acid to 100g of chromium-containing sludge to dissolve completely, the concentration of acid added is 20%, and the amount of acid added is 200g. After electrolyzing the acid-dissolved solution for 24 hours, the copper in the solution was removed, and the concentration of copper ions in the solution was 16mg / m 3 , 3.8g copper elemental substance was recovered. And use the extraction method to remove the iron in the solution, the iron ion concentration in the solution is 24mg / m 3 . After back-extracting the iron extract, a solution of ferric iron is obtained, and after reduction with excess reduced iron powder, a ferrous sulfate solution is obtained. Add 5% sodium hydroxide to the solution to adjust the pH value to 7, and filter to obtain sludge and high-salt solution. Add ferrous sulfate to the high-salt solution, adjust the pH value to 10, heat at 7...

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Abstract

The invention provides a treatment method of separating and recycling copper, iron, zinc, nickle and chromium from chromium-containing sludge and belongs to the field of resource utilization of industrial effluent. The treatment method comprises the following steps: chromium-containing sludge is dissolved in acid, then, electrolysis and the extraction method are adopted to remove copper and iron in solution to obtain ferrous sulfate solution; the obtained impurity removal solution is neutralized and filtered to obtain first sludge and high-salt solution; alkaline liquor and ferrous sulfate solution are added in the high-salt solution, and filtration is carried out to obtain a ferrite product and impurity removed sulfate solution; alkaline leaching is carried out on the first sludge, and the first sludge is put in the reduction pond of a diaphragm electrolytic tank to obtain second sludge and zinc-containing solution; the second sludge is put in an oxidation pond of the diaphragm electrolytic tank to dissolve with the alkaline liquor, and electrolysis, filtering and washing are carried out to obtain a nickle sludge product and zinc-containing hexavalent chromium solution; acid is added in the zinc-containing hexavalent chromium solution to neutralize, filter and wash to obtain chromium-containing zinc sludge and hexavalent chromium solution; and acid and a reducing agent are added in the chromium solution to obtain trivalent chromium solution, and alkaline is added in the trivalent chromium solution to obtain a chrome tanning agent product. The treatment method realizes resource utilization of chromium-containing sludge and does not generate the three wastes.

Description

technical field [0001] The invention belongs to the field of resource utilization of industrial waste liquid, and in particular relates to a treatment method for separating and recovering copper, iron, zinc, nickel and chromium from chromium-containing sludge. Background technique [0002] With the development of the electroplating industry, the output of electroplating wastewater and sludge is increasing. Due to the high toxicity of chromium-containing sludge, the treatment is difficult and the requirements are high, so the treatment difficulty is much higher than other sludges. Chromium-containing sludge also contains other heavy metal impurities, especially zinc and aluminum impurities, which are difficult to distinguish directly by alkali leaching because they are all amphoteric oxides. The usual method is to add an oxidizing agent in the alkaline leaching process to oxidize trivalent chromium to hexavalent chromium, while leaching aluminum and zinc at the same time, and...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B34/32C22B23/00C22B19/20C22B19/30C01D5/06C01D5/16C01D5/18C14C3/06
CPCC01D5/06C01D5/16C01D5/18C14C3/06C22B7/006C22B15/0084C22B19/20C22B19/30C22B23/0453C22B34/32Y02P10/20
Inventor姜德胜陈琪张家东
OwnerWUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD