Method for recovering copper from cyanide-containing waste water and related waste water treatment method

A disposal method and technology for copper recovery, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of long process and low current efficiency, and achieve closed-circuit zero discharge, avoid Effects of Oxidative Loss

Inactive Publication Date: 2007-08-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It has also been reported in the literature that the poor cyanide solution is treated by solvent tertiary amine extraction and copper removal method, and the back-extraction and concentrated cyanide solution is treated by partial acidification-electrowinning method, which can solve the problem of low current efficiency, but the process is long and unavoidable. Part of the cyanide is lost by oxidation at the anode

Method used

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  • Method for recovering copper from cyanide-containing waste water and related waste water treatment method
  • Method for recovering copper from cyanide-containing waste water and related waste water treatment method
  • Method for recovering copper from cyanide-containing waste water and related waste water treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The feed liquid is a poor cyanide solution, and its composition is as follows: CNt 14.57g / L, Cu 8.1g / L, Zn 2.5g / L, CN4.0g / L, SCN- 6.56g / L, Fe trace, pH=11.9 .

[0039] When the solution temperature is 38°C, pH=9, the current density is 9.8~12mA / cm 2 Under the electrowinning conditions, brass containing 73% copper can be obtained on the cathode in the first 2 hours, and then blister copper containing 97% copper can be obtained by continuing electrowinning. Table 1 lists certain cathode blister copper compositions.

[0040] Table 1 cathode blister copper composition (%)

[0041] Cu,

Zn

Ca

Pb

Si

Fe

other

97.0

2.5

0.21

0.17

0.038

0.023

0.059

[0042]When the current efficiency drops below 40% (about 4 to 5 hours), pump the electrolytic solution into the acidification tank, and add sulfuric acid with a concentration of 50% (v / v) into the electrolytic solution at a volume rat...

Embodiment 2

[0046] The feed liquid is a high-concentration copper-cyanide solution, and its composition is as follows: CNt 64g / L, Cu 30.0g / L, Zn 4.1g / L, CN 20g / L, Fe 0.1g / L, pH=12.

[0047] The process flow of electrowinning-partial acidification is shown in Figure 1.

[0048] At a solution temperature of 45°C, pH=10, and a current density of 20-40mA / cm 2 Brass can be obtained by electrodeposition under certain conditions; when the solution temperature is higher than 44°C, the pH is 4.5-8, and the current density is 10-25mA / cm 2 Blister copper containing copper ≥ 98.0% can be obtained by electrowinning. Table 2 lists certain cathode brass and blister copper compositions.

[0049] Table 2 Composition of cathode brass and blister copper (%)

[0050] Cu,

Zn

Ca

Pb

Fe

other

70.5

29.1

0.19

0.1

0.01

0.10

98.2

1.4

0.20

0.1

0.02

0.08

[0051] When the current ef...

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Abstract

The invention discloses a method for recovering copper from cyanic waste water and relative wastewater treatment method, belonging to non-ferrous metallurgy and environmental protection field. It is characterized in that it combines diaphragm electrodeposition with part of acidification, adds acid into electrodeposition liquid and aerates to blow off and recover free CN-, which greatly increases cathodic current efficiency; it employs diaphragm electrodeposition, that is to employ cationic exchange membrane to separate free cyanogen and metal- cyano complex from anode, to avoid cyanogen oxidation in anode; the waste electrodeposition liquid can be reused in cyanogen extraction process, or discharged after further treatment.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy and environmental protection, in particular to a method for recovering copper from cyanide-containing wastewater and a corresponding wastewater treatment method. Background technique [0002] The cyanidation gold leaching method is a method commonly used by gold smelters to extract gold and silver. Gold cyanide wastewater (cyanide barren solution) is not only highly toxic, but also has a large amount of water. A medium-scale cyanide plant produces about 400m3 per day. 3 Poor fluid. Barren solution generally contains total cyanide CNt 0.5-14.0g / L; copper 0.4-9g / L; zinc 0.2-2g / L and a small amount of gold and silver. Some gold concentrates are associated with a considerable amount of copper minerals, and the corresponding barren solution contains copper as high as 8-10g / L and total cyanide as high as 15-22g / L. At present, most gold smelters implement closed-circuit recycling of lean cyanide s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C02F1/461C02F1/62
CPCY02P10/20
Inventor 胡湖生杨明德党杰张胜卓吴玉龙
Owner TSINGHUA UNIV
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