Method for recycling copper from arsenic-containing copper slag

A technology for recycling copper and copper slag, applied in the field of copper recycling, can solve the problems of high pressure on safety and environmental protection, difficult recycling of valuable metals, environmental pollution, etc., to achieve the effect of recycling and avoiding pollution

Inactive Publication Date: 2016-02-24
YANCHENG TONGJI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The roasting method produces flue gas containing toxic arsenic oxides, polluting the environment; the acid leaching method is to oxidize and leach the slag in an acidic medium, recover the copper in the form of copper sulfate, and recover most of the arsenic in the form of arsenic trioxide; but Arsenic trioxide is a highly tox

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of method that reclaims copper from arsenic-containing copper slag is provided in the present embodiment, and it comprises the following steps successively:

[0020] (a) 2kg copper slag is mixed with 1kg strong potassium oxide sheet and then added in the ball mill, and ball milled for 0.5 hour to obtain the ball mill mixture;

[0021] (b) placing the ball-milled mixture in a roasting kiln, filling it with a mixed gas of oxygen and nitrogen with a volume ratio of 1:5, and roasting at 600° C. for 2 hours to obtain a roasted product;

[0022] (c) Pour the roasted product into 40°C, 1mol / L strong potassium oxide solution and soak for 1 hour, and filter to obtain filtrate and filter residue;

[0023] (d) After dissolving the filter residue in the sulfuric acid solution of 1mol / L, insert the cathode and anode for electrolysis so that copper ions are deposited on the cathode (the prior art can be used for electrolysis); Calcium chloride and 1-ethyl-3-methylimidazolium ...

Embodiment 2

[0025] A kind of method that reclaims copper from arsenic-containing copper slag is provided in the present embodiment, and it comprises the following steps successively:

[0026] (a) 1kg copper slag is mixed with 1kg strong potassium oxide sheet and added in the ball mill, and ball milled for 2 hours to obtain the ball mill mixture;

[0027] (b) placing the ball-milled mixture in a roasting kiln, filling it with a mixed gas of oxygen and nitrogen with a volume ratio of 1:9, and roasting at 750° C. for 0.5 hour to obtain a roasted product;

[0028] (c) Pour the roasted product into 80°C, 3mol / L strong potassium oxide solution and soak for 0.5 hours, and filter to obtain filtrate and filter residue;

[0029] (d) After dissolving the filter residue in the sulfuric acid solution of 3mol / L, insert the cathode and the anode for electrolysis so that copper ions are deposited and separated on the cathode (the prior art can be used for electrolysis); Calcium chloride and 1-ethyl-3-me...

Embodiment 3

[0031] A kind of method that reclaims copper from arsenic-containing copper slag is provided in the present embodiment, and it comprises the following steps successively:

[0032] (a) 1.5kg copper slag is mixed with 1kg strong potassium oxide sheet and then added in the ball mill, and ball milled for 1 hour to obtain the ball mill mixture;

[0033] (b) placing the ball-milled mixture in a roasting kiln, filling it with a mixed gas of oxygen and nitrogen with a volume ratio of 1:6, and roasting at 700° C. for 1 hour to obtain a roasted product;

[0034] (c) Pour the roasted product into 60°C, 2mol / L strong potassium oxide solution and soak for 40 minutes, and filter to obtain filtrate and filter residue;

[0035] (d) After dissolving the filter residue in the sulfuric acid solution of 2mol / L, insert the cathode and anode for electrolysis so that copper ions are deposited and separated out on the cathode (the prior art can be used for electrolysis); chlorine is added to the filt...

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Abstract

The invention relates to a method for recycling copper from arsenic-containing copper slag. The method sequentially comprises the following steps that (a) the copper slag is mixed with strong base pieces and put into a ball mill, ball milling is conducted for 0.5-2 hours, and a ball milled mixture is obtained; (b) the ball milled mixture is put into a calcination kiln, a mixed gas of oxygen and nitrogen is fed into the calcinations kiln, calcination is conducted for 0.5-2 hours at the temperature of 600-750 DEG C, and a calcination product is obtained; (c) the calcination product is poured into a 40-80 DEG C strong alkaline solution and soaked for 0.5-1 hour, and a filtrate and filter residues are obtained through filtration; and (d) the filter residues are inserted into a cathode and an anode for electrolysis after being putting into a sulfuric acid solution for dissolution, and copper ions are deposited and precipitated on the cathode, calcium chloride and 1-ethyl-3-methylimidazolium chloride salts are added into the filtrate until no precipitation occurs, and filtration is conducted after stirring. A mixture of the calcium chloride and the 1-ethyl-3-methylimidazolium chloride salts is added into an arsenic-containing solution, and arsenous acid radicals in the solution are completely precipitated through mutual cooperation of calcium ions and 1-ethyl-3-methylimidazolium ions, so that the environmental pollution caused by the arsenous acid radicals is avoided.

Description

technical field [0001] The invention belongs to the field of copper recovery and utilization, and in particular relates to a method for recovering copper from arsenic-containing copper slag. Background technique [0002] Copper products such as copper wires, copper rods, and copper medals are usually made by cooling and extruding molten copper after being guided, and copper water is usually melted in a melting furnace by copper plates obtained after copper ore smelting. However, due to the poor circulation of the copper water in the melting furnace, it is easy to cause impurities to gradually accumulate at the bottom of the melting furnace, eventually forming slag; arsenic is a relatively common impurity element in the slag. [0003] The existing slag treatment methods mainly include roasting method, acid leaching method, alkali leaching method and so on. The roasting method produces flue gas containing toxic arsenic oxides, polluting the environment; the acid leaching meth...

Claims

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Application Information

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IPC IPC(8): C22B1/11C22B7/04C25C1/12
CPCC22B1/11C22B7/008C22B7/04C25C1/12Y02P10/20
Inventor 章志尧
Owner YANCHENG TONGJI NEW MATERIAL TECH CO LTD
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