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Method for separating zinc, cadmium, copper, lead and silver from zinc smelting copper slag

A technology for zinc smelting and copper slag, which is applied in the field of separating zinc, copper, lead, silver, and cadmium from zinc smelting copper slag, which can solve the problems of large consumption of zinc powder and achieve the effect of reducing the amount of processing and producing clean and efficient

Active Publication Date: 2015-08-19
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Peng Jianrong and others published in the 8th issue of "Nonferrous Metals" (Smelting Part) in 2013 "Research on Preparation of Copper Sulfate by Copper Slag Oxygen Pressure Acid Leaching", using oxygen pressure acid leaching to treat copper slag, so that Cu, Zn, Cd and other elements are dissolved, and the filtrate is prepared by direct crystallization method to prepare copper sulfate crystals, so that Zn, Cd, etc. are left in the crystallization mother liquor, and zinc powder is added to replace copper, so that copper is re-entered into slag and separated from zinc and cadmium, and zinc powder is consumed when copper is replaced. Large amount, the problem that copper needs to be leached again

Method used

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  • Method for separating zinc, cadmium, copper, lead and silver from zinc smelting copper slag
  • Method for separating zinc, cadmium, copper, lead and silver from zinc smelting copper slag
  • Method for separating zinc, cadmium, copper, lead and silver from zinc smelting copper slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Slurry 20t of copper slag after mixing, the composition is: Zn 5.65%, Cd 2.51%, Cu 49.19%, directly with water.

[0036] 2) Continuously pump the pulped copper slag and dilute sulfuric acid into the autoclave respectively, and the amount of dilute sulfuric acid added is 0.8 times of the acid consumption of Zn and Cd in the copper slag.

[0037] 3) Continuously feed industrial oxygen, and control the temperature in the kettle to 120°C, oxygen partial pressure to 0.6Mpa, reaction time to 2.0h, and end point pH to 5.4.

[0038] 4) After the pulp leached from the autoclave is depressurized and cooled by the flash tank and the regulating tank, it is filtered by a box-type filter press, and the filter cake is slurried and then filtered again. The filtrate obtained by the two presses enters the zinc smelting system to recover Zn and Cd .

[0039] 5) After mixing the filter cake obtained by two times of pressure filtration, add dilute sulfuric acid, leaching copper at norma...

Embodiment 2

[0041] 1) Slurry 24t of mixed copper slag with the following components: Zn 7.39%, Cd 6.11%, Cu 24.33%, directly with water.

[0042]2) Continuously pump the pulped copper slag and dilute sulfuric acid into the autoclave respectively, and the amount of sulfuric acid added is 0.9 times of the acid consumption of Zn and Cd reaction in the copper slag.

[0043] 3) Oxygen is fed continuously, and the temperature in the kettle is controlled to 100°C, the oxygen partial pressure is 0.4Mpa, the reaction time is 1.5h, and the end point pH is 5.2.

[0044] 4) After the pulp leached from the autoclave is depressurized and cooled by the flash tank and the regulating tank, it is filtered by a box-type filter press, and the filter cake is slurried and then filtered again. The filtrate obtained by the two presses enters the zinc smelting system to recover Zn and Cd .

[0045] 5) After mixing the filter cake obtained by two times of pressure filtration, add dilute sulfuric acid, leaching co...

Embodiment 3

[0047] 1) The mixed copper slag 21t, whose composition is: Zn 9.67%, Cd 10.09%, Cu 10.93%, is directly slurried with water.

[0048] 2) Pour the pulped copper slag and dilute sulfuric acid into the autoclave separately and continuously, and the amount of sulfuric acid added is 1.0 times of the acid consumption of Zn and Cd reaction in the copper slag.

[0049] 3) Oxygen is fed continuously, and the temperature in the kettle is controlled at 80°C, the oxygen partial pressure is 0.2Mpa, the reaction time is 1.0h, and the final pH is 5.0.

[0050] 4) After the pulp leached from the autoclave is depressurized and cooled by the flash tank and the regulating tank, it is filtered by a box-type filter press, and the filter cake is slurried and then filtered again. The filtrate obtained by the two presses enters the zinc smelting system to recover Zn and Cd .

[0051] 5) After mixing the filter cake obtained by two times of pressure filtration, add dilute sulfuric acid, leaching coppe...

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PUM

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Abstract

The invention relates to a method for separating zinc, cadmium, copper, lead and silver from zinc smelting copper slag and belongs to the field of wet-process metallurgy of nonferrous metals. The method comprises the following steps: directly slurrying mixed copper slag without ore grinding; leaching by adopting a pressure reactor; controlling the technical parameters of acid volume, temperature, oxygen partial pressure, reaction time, terminal pH value and the like; dissolving out zinc and cadmium from the copper slag into a solution; dissolving out copper, and hydrolyzing the copper into copper hydroxide which is added into the slag again; performing liquid-solid separation and washing on a leached ore pulp, and then adding the filtrate containing zinc and cadmium and a washing solution into a zinc smelting system to recover zinc and cadmium; adding sulfuric acid to a filter cake, and controlling the leaching terminal pH value at a normal temperature and a normal pressure to ensure that copper is leached out; and performing liquid-solid separation on a copper leaching ore pulp, and then adding the obtained lead and silver slag into a lead smelting system to recover lead and silver. By adopting the technical scheme of the invention, zinc, cadmium and copper can be completely separated, copper is completely separated from lead and silver, the valuable metals of Cu, Zn, Cd, Pb, Ag and the like in the copper slag can be completely recycled, the whole process avoids the generation of 'three wastes', and the production is clean and efficient.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of nonferrous metals, and in particular relates to a method for separating zinc, cadmium, copper and lead and silver from zinc smelting copper slag. Background technique [0002] When zinc hydrometallurgy processes such as conventional leaching or direct leaching are used, copper and cadmium in the zinc concentrate enter the solution, and when the purification unit uses zinc powder to purify and remove impurities, copper and cadmium in the solution enter the purification slag At the same time, lead, silver and other metals brought by zinc powder also enter the purification slag; most of the zinc and cadmium in the purification slag are leached with dilute sulfuric acid or zinc electrowinning waste liquid, and copper slag is obtained after liquid-solid separation. [0003] Due to the different contents of Cu and Cd in the zinc concentrates of various enterprises, different leaching, purification and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B11/00C22B19/30C22B17/00
CPCY02P10/20
Inventor 刘艳涛晋家强周开敏余国林翟琳娜周永贵
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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