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Recycling method for heavy metal in electroplating sludge

A technology for electroplating sludge and heavy metals, applied in the direction of improving process efficiency, can solve the problems of large organic pollution, low recovery rate of heavy metals, and high energy consumption, and achieve the effects of reducing organic pollution, simple and easy operation, and low energy consumption.

Active Publication Date: 2019-07-26
福建省固体废物处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problems of low recovery rate of heavy metals in the prior art, large organic pollution generated in the process, and high energy consumption, the present invention provides a method for recycling heavy metals from electroplating sludge

Method used

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  • Recycling method for heavy metal in electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (1) add sulfuric acid with pH=1 to carry out sludge leaching, by weight, sludge: sulfuric acid=4:1, leaching temperature is 25 ℃, leaching time is 45min, obtains mixture A;

[0069] (2) A is subjected to pressure filtration with a pressure of 0.2 MPa to obtain filter residue a1 and filtrate b1, and the obtained filter residue a1 is solidified and landfilled;

[0070] (3) add iron powder in filtrate b1, by weight, filtrate b1: iron powder=4:1, carry out pressure filtration then, obtain metallic copper and filtrate b2;

[0071] (4) add hydrogen peroxide in filtrate b2, by weight, filtrate b2: hydrogen peroxide=50:1, then add sodium hydroxide, by weight, hydrogen peroxide: sodium hydroxide=1:9, pressure filtration obtains iron Chromium slag and filtrate b3, filtrate b3 leads to sewage treatment station;

[0072] (5) Add sodium hypochlorite and sodium hydroxide to iron chromium slag, the temperature is 20 ℃, by weight, iron chromium slag: sodium hypochlorite=1:1, sodium hy...

Embodiment 2

[0076] (1) adding hydrochloric acid with pH=1 to carry out sludge leaching, in parts by weight, sludge: hydrochloric acid=5:1, leaching temperature is 30°C, leaching time is 40min, and mixture A is obtained;

[0077] (2) A is subjected to pressure filtration with a pressure of 0.4 MPa to obtain filter residue a1 and filtrate b1, and the obtained filter residue a1 is solidified and landfilled;

[0078] (3) add iron powder in filtrate b1, by weight, filtrate b1: iron powder=5:1, carry out pressure filtration then, obtain metal copper and filtrate b2;

[0079] (4) add hydrogen peroxide in the filtrate b2, by weight, filtrate b2: hydrogen peroxide=55:1, then add potassium hydroxide, by weight, hydrogen peroxide: potassium hydroxide=1:10, pressure filtration obtains iron Chromium slag and filtrate b3, filtrate b3 leads to sewage treatment station;

[0080] (5) Add hydrogen peroxide and potassium hydroxide to the iron-chromium slag at a temperature of 25° C., in parts by weight, ir...

Embodiment 3

[0084] (1) adding nitric acid with pH=1 for sludge leaching, in parts by weight, sludge: nitric acid=4.5:1, leaching temperature is 27°C, leaching time is 60min, and mixture A is obtained;

[0085] (2) A is subjected to pressure filtration with a pressure of 0.3 MPa to obtain filter residue a1 and filtrate b1, and the obtained filter residue a1 is solidified and landfilled;

[0086] (3) add iron powder in filtrate b1, by weight, filtrate b1:iron powder=4.5:1, carry out pressure filtration then, obtain metal copper and filtrate b2;

[0087] (4) add hydrogen peroxide in the filtrate b2, by weight, filtrate b2: hydrogen peroxide=52:1, then add potassium hydroxide, by weight, hydrogen peroxide: potassium hydroxide=1:9.5, pressure filtration obtains iron Chromium slag and filtrate b3, filtrate b3 leads to sewage treatment station;

[0088] (5) Add sodium hypochlorite and potassium hydroxide to iron chromium slag, the temperature is 20 ℃, by weight, iron chromium slag: sodium hypoc...

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Abstract

The invention relates to the technical field of management of dangerous wastes and particularly relates to a recycling method for heavy metal in electroplating sludge. The recycling method comprises the following steps: (1) adding acid and carrying out sludge leaching; regulating the pH (Potential of Hydrogen) value to obtain a mixture A; (2) carrying out filter pressing on the mixture A to obtainfilter residue a1 and filtrate b1; (3) adding iron powder into the filtrate b1 and carrying out the filter pressing to obtain metal copper and filtrate b2; (4) adding an oxidant and alkali into the filtrate b2 and carrying out the filter pressing to obtain iron-chromium residue and filtrate b3; (5) adding the oxidant and the alkali into the obtained iron-chromium residue and carrying out the filter pressing to obtain iron hydroxide and filtrate b4; (6) calcining the obtained ferric hydroxide to obtain iron oxide red; and (7) adding sulfuric acid and lead nitrate into the filtrate b4 and carrying out the filter pressing to obtain lead chromate and filtrate b5. The treatment method provided by the invention has a heavy metal recycling rate, relatively small secondary pollution caused in theprocess and low energy consumption.

Description

technical field [0001] The invention relates to the field of hazardous waste treatment, in particular to a method for recycling heavy metals from electroplating sludge. Background technique [0002] Electroplating sludge is a solid waste that has been neutralized from wastewater in electronics, electroplating, circuit board surface treatment and other processing industries. It is listed as hazardous waste by the state and belongs to the seventeenth category of hazardous waste. [0003] The precipitates mainly composed of heavy metal hydroxides such as copper and chromium produced during the treatment of electroplating wastewater have complex components. Due to the large amount of electroplating wastewater, complex composition, high COD, and high content of heavy metals, if it is discharged without treatment, it will cause serious environmental pollution. During the treatment of electroplating wastewater, a large amount of electroplating sludge will also be formed. These ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B15/00C22B34/32
CPCC22B7/006C22B7/007C22B15/0089C22B34/32Y02P10/20
Inventor 姚虹柯仁锐徐同德余群燕王璐琪
Owner 福建省固体废物处置有限公司
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