A method for recycling copper and cadmium from copper cadmium slag

A technology of copper cadmium slag and copper slag, which is applied in the field of recycling of smelting engineering by-products, can solve the problems of resource waste, environmental protection burden, etc., and achieve the effects of reducing costs, reducing stacking and storage, and good economic benefits

Active Publication Date: 2020-04-24
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the copper cadmium slag is stockpiled, it will not only cause environmental protection burden, but also cause serious waste of resources.

Method used

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  • A method for recycling copper and cadmium from copper cadmium slag

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Experimental program
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Effect test

Embodiment 1

[0019] This embodiment is a method for recycling copper and cadmium from copper-cadmium slag. The main components in copper-cadmium slag are: Zn: 37.6%, Cu: 5.8%, and Cd: 15.3%.

[0020] (1) Copper and cadmium slag is ball milled and transported to the thickener for liquid-solid separation. After liquid-solid separation, 20m of thickener bottom flow slag is 3 (Liquid to solid volume ratio 2:1) pump into the leaching tank, add copper cadmium slag pickling pulp filtrate to 27m 3 Turn on the steam and heat to 90°C, and slowly add concentrated sulfuric acid at the same time. When the pH of the pulp is ≤ 2.5, stop adding acid. When the pH value rises to 3.5 during the reaction, add concentrated sulfuric acid until the pH value is 2.5, stop adding acid. Repeat the above process of adding concentrated sulfuric acid. When the pH value of the pulp is stable at 2.5-3.5 for 30 minutes, the copper cadmium slag leaching operation is ended. The final pH value of the pulp is 3.0. The whole l...

Embodiment 2

[0025] This embodiment is a method for recycling copper and cadmium from copper-cadmium slag. The main components in copper-cadmium slag are: Zn: 36.8%, Cu: 6.3%, and Cd: 14.8%.

[0026] (1) Copper and cadmium slag is ball milled and transported to the thickener for liquid-solid separation. After liquid-solid separation, 20m of thickener bottom flow slag is 3 (Liquid to solid volume ratio 2:1) pump into the leaching tank, add copper cadmium slag pickling pulp filtrate to 33m 3 Turn on the steam and heat to 85°C, and slowly add concentrated sulfuric acid at the same time, when the pH of the pulp is ≤ 2.5, stop adding acid, when the pH value rises to 3.5 during the reaction, add concentrated sulfuric acid until the pH value is 2.5, stop adding acid, Repeat the above process of adding concentrated sulfuric acid. When the pH value of the pulp is stable between 2.5-3.5 for 40 minutes, the copper-cadmium slag leaching operation is ended. The final pH value of the pulp is 2.5. The en...

Embodiment 3

[0031] This embodiment is a method for recycling copper and cadmium from copper-cadmium slag. The main components in copper-cadmium slag are: Zn: Zn: 38.1%, Cu: 5.6%, and Cd: 15.6%.

[0032] (1) Copper and cadmium slag is ball milled and transported to the thickener for liquid-solid separation. After liquid-solid separation, 20m of thickener bottom flow slag is 3 (Liquid to solid volume ratio 2:1) pump into the leaching tank, add copper cadmium slag pickling pulp filtrate to 40m 3 Turn on steam and heat to 80°C, and slowly add concentrated sulfuric acid at the same time, when the pH of the pulp is ≤ 2.5, stop adding acid, when the pH value rises to 3.5 during the reaction, add concentrated sulfuric acid until the pH value is 2.5, stop adding acid, Repeat the above process of adding concentrated sulfuric acid. When the pH value of the pulp is stable between 2.5-3.5 for 40 minutes, the copper-cadmium slag leaching operation is ended. The final pH value of the pulp is 3.5. The en...

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Abstract

The invention discloses a method for recycling copper and cadmium from copper and cadmium sediment, and belongs to the technical field of recycling of by-products of smelting engineering. By the principle that zinc, cadmium and oxides of the zinc and the cadmium in the copper and cadmium sediment are easily dissolved in sulfuric acid but copper is not dissolved in the sulfuric acid, the copper isseparated from the zinc and the cadmium, then metal copper slag with the copper content greater than 65% is produced by washing and filtering, the copper slag is sold as a copper smelting raw material, and thus, the copper and cadmium sediment is utilized effectively, and has high economic benefit. By recycling the copper and cadmium sediment, the stacked and stored copper and cadmium sediment isreduced, and pollution to the environment is relieved.

Description

technical field [0001] The invention belongs to the technical field of recycling by-products of smelting engineering, in particular to a method for recycling copper and cadmium from copper-cadmium slag. Background technique [0002] In the process of zinc hydrometallurgy, copper and cadmium in the zinc sulfate solution exist in the solution in the form of sulfate. Metal zinc powder is added, and copper and cadmium in the solution are removed to the index control range by replacement method, and the slag that is replaced is copper cadmium slag. The weight percentages of main components in the copper cadmium slag are: Zn: 35-40%, Cu: 5-7%, Cd: 13-16%. If the copper cadmium slag is stockpiled, it will not only cause environmental burden, but also cause serious waste of resources. Contents of the invention [0003] The purpose of the present invention is to provide a kind of zinc, cadmium loss little, the method that copper grade is high to recycle copper, cadmium from coppe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B17/00
CPCC22B7/007C22B15/0071C22B17/04Y02P10/20
Inventor 冶玉花张昱琛郭永峰崔耀马菲菲段小维崔金虎
Owner BAIYIN NONFERROUS GROUP
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