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Method for recovering heavy metal from copper-containing sludge

A technology of copper sludge and heavy metals, applied in the direction of improving process efficiency, etc., can solve the problems of copper-containing sludge waste and other problems, and achieve the effect of efficient resource utilization

Inactive Publication Date: 2021-01-01
长沙如洋环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for recovering heavy metals from copper-containing sludge, so as to solve technical problems such as resource waste of copper-containing sludge

Method used

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  • Method for recovering heavy metal from copper-containing sludge

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Effect test

Embodiment 1

[0036] A method for recovering heavy metals from copper-containing sludge, the specific steps are as follows:

[0037] (1) First mix soybean rhizobia, Pseudomonas cepacia and Lactobacillus according to a mass ratio of 1:0.3:0.8 to make a mixed bacterial powder, then inoculate the mixed bacterial powder into copper-containing sludge, and ferment to obtain a fermentation product;

[0038] (2) Then add the first part of concentrated hydrochloric acid to the fermentation product, add dropwise phosphoric acid aqueous solution while stirring, add the second part of concentrated hydrochloric acid after the dropwise addition, stir and react, centrifuge to obtain the supernatant and precipitation I, and enter the step ( 3) and (4);

[0039] (3) Immerse the excess iron wire in the supernatant, stir and react, and collect the precipitate II by centrifugation;

[0040] (4) Finally, add the precipitate I to the concentrated hydrochloric acid, stir the reaction, collect the precipitate III...

Embodiment 2

[0056] A method for recovering heavy metals from copper-containing sludge, the specific steps are as follows:

[0057] (1) First mix soybean rhizobia, Pseudomonas cepacia and Lactobacillus according to a mass ratio of 1:0.5:0.5 to make a mixed bacterial powder, then inoculate the mixed bacterial powder into copper-containing sludge, and ferment to obtain a fermentation product;

[0058] (2) Then add the first part of concentrated hydrochloric acid to the fermentation product, add dropwise phosphoric acid aqueous solution while stirring, add the second part of concentrated hydrochloric acid after the dropwise addition, stir and react, centrifuge to obtain the supernatant and precipitation I, and enter the step ( 3) and (4);

[0059] (3) Immerse the excess iron wire in the supernatant, stir and react, and collect the precipitate II by centrifugation;

[0060] (4) Finally, add the precipitate I to the concentrated hydrochloric acid, stir the reaction, collect the precipitate III...

Embodiment 3

[0076] A method for recovering heavy metals from copper-containing sludge, the specific steps are as follows:

[0077] (1) First mix soybean rhizobia, Pseudomonas cepacia and Lactobacillus according to a mass ratio of 1:0.4:0.7 to make a mixed bacterial powder, then inoculate the mixed bacterial powder into copper-containing sludge, and ferment to obtain a fermentation product;

[0078] (2) Then add the first part of concentrated hydrochloric acid to the fermentation product, add dropwise phosphoric acid aqueous solution while stirring, add the second part of concentrated hydrochloric acid after the dropwise addition, stir and react, centrifuge to obtain the supernatant and precipitation I, and enter the step ( 3) and (4);

[0079] (3) Immerse the excess iron wire in the supernatant, stir and react, and collect the precipitate II by centrifugation;

[0080] (4) Finally, add the precipitate I to the concentrated hydrochloric acid, stir the reaction, collect the precipitate III...

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Abstract

The invention provides a method for recovering heavy metal from copper-containing sludge. The method comprises the following steps that rhizobium japonicum, pseudomonas onions and lactobacillus are mixed to prepare mixed bacterial powder, the copper-containing sludge is inoculated with the mixed bacterial powder, fermentation is conducted, and a fermentation product is obtained; and then a first part of concentrated hydrochloric acid, a phosphoric acid aqueous solution and a second part of concentrated hydrochloric acid are sequentially added into the fermentation product, stirring is conducted, a reaction is carried out, centrifuging is conducted, and then a supernatant and sediment I are obtained; the supernatant is replaced with excessive iron wires to obtain sediment II; and the sediment I is dissolved with concentrated hydrochloric acid for a reaction to obtain sediment III, and the sediment II and the sediment III are combined to obtain sponge copper. Heavy metal, especially copper, in the copper-containing sludge is recovered, and efficient resource utilization of the copper-containing sludge is achieved.

Description

technical field [0001] The invention relates to the technical field of waste recycling, in particular to a method for recovering heavy metals from copper-containing sludge. Background technique [0002] Heavy mining, non-ferrous metal smelting, mechanical processing, and electroplating are the main industries that produce copper-containing wastewater. Because copper-containing wastewater has the characteristics of persistence, high toxicity, serious pollution, and non-biodegradation, it is extremely harmful to the ecological environment. At present, the treatment method of copper-containing wastewater generally uses sewage purifying agents such as flocculants to separate the precipitation of heavy metal pollutants in sewage from water, so as to achieve the purpose of meeting the national sewage discharge standards for the content of heavy metals in sewage. As a result, copper-containing sludge with a high content of copper and other metals is produced. Due to the complex c...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00
CPCC22B7/007C22B15/0069C22B15/0091Y02P10/20
Inventor 陈小毛
Owner 长沙如洋环保科技有限公司
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