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Method for comprehensively recovering valuable metal in copper slag

A technology for recovering valuable metals and copper, applied in the field of metallurgical environmental engineering, can solve the problems of unsolved flocculating gel silicon, increase recovery costs, block metal recovery, etc., and achieve low cost, easy operation and high recovery rate. Effect

Inactive Publication Date: 2019-12-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, pyro-method depletion and recovery of valuable metals in copper slag requires a lot of energy consumption, increases the cost of recycling, and will cause secondary pollution, which has been basically eliminated.
At present, there are very few reports on the comprehensive recovery of valuable metals in copper slag by wet methods, and none of them has solved the problem of flocculating gel silicon in the process of acid leaching copper slag, which leads to difficulties in solid-liquid separation and hinders metal recovery.

Method used

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  • Method for comprehensively recovering valuable metal in copper slag
  • Method for comprehensively recovering valuable metal in copper slag
  • Method for comprehensively recovering valuable metal in copper slag

Examples

Experimental program
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Effect test

Embodiment 1

[0053] First weigh 20g of dried and crushed pretreated copper slag, then mix it with 3mol sulfuric acid + 30% hydrogen peroxide mixture (L:L=1:1) according to the solid-liquid ratio S:L=1:10, at a speed of 600r Ball mill for 240min under the condition of 1 / min, stand still for 120min and then filter to obtain filtrate rich in valuable metals such as lead, zinc, copper, cobalt, etc. The filter residue is magnetically separated for 90min under the condition of magnetic separation intensity of 8000GBS to obtain magnetic iron concentrate. Filter residue XRD see Figure 5 , its magnetic separation iron concentrate XRD see Figure 6 , magnetic separation tailings XRD see Figure 7 .

Embodiment 2

[0055] First weigh 20g of dried and crushed pretreated copper slag, then mix it with 1mol sulfuric acid + 20% hydrogen peroxide mixture (L:L=1:2) according to the solid-liquid ratio S:L=1:5, at a speed of 400r Ball mill for 120min under the condition of 1 / min, stand still for 240min and then filter to obtain filtrate rich in valuable metals such as lead, zinc, copper, cobalt, etc., and magnetically separate the filter residue for 60min under the condition of magnetic separation intensity of 6000GBS to obtain magnetic iron concentrate.

Embodiment 3

[0057] First weigh 20g of dried and crushed pretreated copper slag, then mix it with 2mol sulfuric acid + 20% hydrogen peroxide mixture (L:L=1:1) according to the solid-liquid ratio S:L=1:8, at a speed of 500r Ball mill for 30 minutes under the condition of 1 / min, stand still for 240 minutes and then filter to obtain filtrate rich in valuable metals such as lead, zinc, copper, cobalt, etc., and magnetically separate the filter residue for 30 minutes under the condition of magnetic separation intensity of 10000GBS to obtain magnetic iron concentrate.

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Abstract

The invention discloses a method for comprehensively recovering valuable metal in copper slag. The method comprises the steps that the pretreated copper slag is mixed with hydrogen peroxide and sulfuric acid in a certain proportion, the materials are subjected to ball milling reaction for a certain time, the mixture stands still and is filtered to obtain filtrate rich in valuable metal and leaching residues, and the leaching residues are subjected to magnetic separation to recycle iron resources. The method has the advantages that the ball milling process reduces generation of flocculation type gel silicon, reduces blocking of the valuable metal, solves common problems that the copper slag is large in cardinality and resourceful treatment is difficult, realizes reduction and secondary recycling of the copper slag, and opens up a green sustainable development road for treatment of waste residues in the metallurgical industry.

Description

technical field [0001] The invention relates to a method for comprehensively recovering valuable metals in copper slag, belonging to the field of metallurgical environmental engineering. Background technique [0002] With the gradual maturity of my country's copper smelting industry technology, the treatment of copper slag has gradually become a hot spot of concern. In the copper smelting process, every 1 ton of copper produced will produce 2.2 tons of copper slag, and the copper smelting industry in my country has produced hundreds of millions of tons of copper slag over the years. Copper slag contains a large amount of valuable metals, among which the content of copper, zinc, iron and cobalt can reach 3-5%, 1-2%, 36-42%, 0.01-0.05%, and copper slag also contains a small amount of Toxic and harmful metals, the content of lead can reach 0.8%-2.2% respectively. At present, most of these copper slags are stored in open-air slag yards, occupying a large amount of land resourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B1/00C22B19/20C22B19/30C22B23/00C22B15/00C22B13/00B03C1/02
CPCB03C1/02C22B1/005C22B7/007C22B7/04C22B13/045C22B15/0071C22B19/22C22B19/30C22B23/043Y02P10/20
Inventor 柯勇闵小波王静雯许秋婧梁彦杰王忠兵王云燕史美清姜光华任慧川
Owner CENT SOUTH UNIV