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Method for extracting metal copper from copper-containing sludge on circuit board

A technology for extracting metals and circuit boards, applied in the direction of improving process efficiency, etc., can solve problems such as limited sludge leaching effect, achieve good leaching effect, save costs, and reduce energy consumption costs

Inactive Publication Date: 2021-01-12
HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current biological wet method mostly adopts a single bioleaching method, and the leaching effect on sludge is still limited, and the recovery rate of copper needs to be further improved.

Method used

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  • Method for extracting metal copper from copper-containing sludge on circuit board
  • Method for extracting metal copper from copper-containing sludge on circuit board
  • Method for extracting metal copper from copper-containing sludge on circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A method of extracting metallic copper from circuit board copper-containing sludge of the present invention, such as figure 1 As shown, the circuit board copper-containing sludge produced by a circuit board factory is used as raw material, the copper content is 14-20%, and the iron grade is 25-35%. The specific steps are as follows:

[0041] (1) Determination of acid consumption: Carry out relevant measurement to raw material, its water content is 55.34%, and copper content is 12.97%, after taking part raw material and drying under the condition of 105 ℃, take 10g dry basis and add 100mL distilled water, slowly, Continue to add 98% concentrated sulfuric acid until the slurry pH value is stable at about 1.5, record the addition of 98% concentrated sulfuric acid (mass concentration), which is the acid consumption of the raw material; record the 98% concentrated sulfuric acid acid consumption per 10g dry basis The volume is 3.7mL;

[0042] (2) Pretreatment: Weigh 44.78g o...

Embodiment 2

[0052] A method for extracting metallic copper from circuit board copper-containing sludge according to the present invention uses the circuit board copper-containing sludge produced by a circuit board factory as raw material, the copper content is 14-20%, and the iron grade is 25-35% , including the following steps:

[0053] (1) Determination of acid consumption: Carry out relevant determination to raw material, its water content is 60%, copper content is 12.60%, after taking part raw material and drying under the condition of 105 ℃, take 10g dry basis and add 100mL distilled water, slowly, Continue to add 98% concentrated sulfuric acid until the slurry pH value is stable at about 1.5, record the addition of 98% concentrated sulfuric acid (mass concentration), which is the acid consumption of the raw material; record the 98% concentrated sulfuric acid acid consumption per 10g dry basis The volume is 4.0mL;

[0054] (2) Pretreatment: Weigh 25kg of raw materials on a wet basis...

Embodiment 3

[0064] A method for extracting metallic copper from circuit board copper-containing sludge according to the present invention uses the circuit board copper-containing sludge produced by a circuit board factory as raw material, the copper content is 14-20%, and the iron grade is 25-35% , including the following steps:

[0065] (1) Determination of acid consumption: Carry out relevant measurement to raw material, its water content is 58%, and copper content is 14.80%, after taking part raw material and drying under the condition of 105 ℃, take 10g dry basis and add 100mL distilled water, slowly, Continue to add 98% concentrated sulfuric acid until the slurry pH value is stable at about 1.5, record the addition of 98% concentrated sulfuric acid (mass concentration), which is the acid consumption of the raw material; record the 98% concentrated sulfuric acid acid consumption per 10g dry basis The amount is 4.2g;

[0066] (2) Pretreatment: Weigh 5t of raw materials on a wet basis,...

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Abstract

The invention discloses a method for extracting metal copper from copper-containing sludge on a circuit board. The method comprises the steps of adding concentrated sulfuric acid into the copper-containing sludge on the circuit board for pretreatment; adding biological bacteria liquid into the pretreated copper-containing sludge on the circuit board, and carrying out stirring and leaching to finish the solid-liquid separation; sequentially adding clear water and hydrogen peroxide into obtained leaching residue, carrying out the enhanced stirring and leaching, and then carrying out the solid-liquid separation and the washing; and extracting copper from an obtained leaching solution, and carrying out cyclone electrodeposition after back extraction to extract the metal copper. According to the method, firstly, the copper in the copper-containing sludge on the circuit board is leached by adopting a biological wet method, and then the hydrogen peroxide is added in the process for the secondary enhanced leaching, so that a leaching effect better than the single biological leaching is obtained, the maximum recovery of the copper in the copper-containing sludge on the circuit board is achieved, and meanwhile, the leaching residue reaches a harmless discharge standard and can be discharged or utilized as a harmless resource.

Description

technical field [0001] The invention belongs to the field of biological leaching recovery of solid waste, in particular to a method for extracting metal copper from circuit board copper-containing sludge by adopting a biological-chemical combined treatment process. Background technique [0002] The printed circuit board industry is a high energy consumption and high pollution industry. The main pollutant is copper. Because the utilization rate of copper is not high, its pollution forms are mainly etching liquid and solid waste, which are hazardous waste. Most of the etching solution is treated by chemical coagulation and precipitation method. Specifically, chemical agents such as coagulant, pH value regulator and polymer coagulant are added during the treatment process, and after precipitation by sodium sulfide or heavy metal collector copper sludge. The sludge contains a considerable amount of heavy metal components, which is directly listed in the "National Hazardous Wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/18C22B3/04C22B15/00
CPCC22B7/006C22B7/007C22B15/0065C22B15/0071Y02P10/20
Inventor 李凯赵邵安秦荣钢
Owner HUNAN AIGE ENVIRONMENTAL PROTECTION TECH CO LTD
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