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Method for efficiently recycling copper and cadmium from copper and cadmium slag

A copper-cadmium slag, high-efficiency technology, applied in the field of cadmium, high-efficiency recovery and utilization of copper, can solve the problems of reducing the economic value of metals, increasing production costs, low metal purity, etc., and achieving convenient purification and refining, low cost and short process cycle. Effect

Inactive Publication Date: 2020-12-18
衡阳市大宇锌业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of the above two methods have the problems of long process, requiring many storage tanks and sites to store solutions and filter residues, and at the same time, the recovered metals have low purity, which reduces the economic value of metals and indirectly increases production costs.

Method used

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  • Method for efficiently recycling copper and cadmium from copper and cadmium slag

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Effect test

Embodiment 1

[0038] A method for efficiently recycling copper and cadmium from copper-cadmium slag, comprising the following steps:

[0039] (1) Ball milling: Put the copper-cadmium slag produced by hydrometallurgy into a wet ball mill, add deionized water for ball milling, and control the volume ratio of liquid slag to 1:1; the amount of ball stones loaded is equal to the weight of copper-cadmium slag; The ball stones are stainless steel balls; ball milled for 1h; the ball stones include four kinds of equal amounts of 1, 2, 3, and 4 cm in different diameters; the weight percentages of the main components in the copper-cadmium slag are: Zn: 25%, Cu : 8%, Cd: 9%;

[0040] (2) Solid-liquid separation of the thickener: transport the above-mentioned ball-milled slurry to the thickener for liquid-solid separation at a speed of 1 rpm; after liquid-solid separation, pump the underflow slag of the thickener into the leaching tank;

[0041] (3) Leaching: Heat the leaching tank to 80°C, add acid, c...

Embodiment 2

[0046] A method for efficiently recycling copper and cadmium from copper-cadmium slag, characterized in that it comprises the following steps:

[0047] (1) Ball milling: Put the copper-cadmium slag produced by hydrometallurgy into a wet ball mill, add deionized water for ball milling, and control the volume ratio of liquid slag to 1.5:1; the amount of ball stone loaded is 1.2 times the weight of copper-cadmium slag ; The ball stone is a stainless steel ball; Ball milling 1h; The ball stone includes four kinds of equal amounts of 1, 2, 3, 4cm different diameters; The weight percentage of the main components in the copper cadmium slag is: Zn: 27% , Cu: 9%, Cd: 10%;

[0048] (2) Solid-liquid separation of the thickener: transport the slurry after ball milling to the thickener for liquid-solid separation at a speed of 2 rpm; after liquid-solid separation, pump the underflow slag of the thickener into the leaching tank;

[0049] (3) Leaching: Heat the leaching tank to 85°C, add ac...

Embodiment 3

[0054] A method for efficiently recycling copper and cadmium from copper-cadmium slag, comprising the following steps:

[0055] (1) Ball milling: Put the copper-cadmium slag produced by hydrometallurgy into a wet ball mill, add deionized water for ball milling, and control the volume ratio of liquid slag to 2:1; the amount of ball stone loaded is 1.5 times the weight of copper-cadmium slag ; The ball stone is a stainless steel ball; Ball milling 1-2h; The ball stone includes four kinds of equal amounts of 1, 2, 3, 4cm different diameters; The weight percentage of the main component in the copper cadmium slag is: Zn : 30%, Cu: 10%, Cd: 12%;

[0056] (2) Solid-liquid separation of the thickener: transport the slurry after ball milling to the thickener for liquid-solid separation at a speed of 5 rpm; after liquid-solid separation, pump the underflow slag of the thickener into the leaching tank;

[0057] (3) Leaching: Heat the leaching tank to 90°C, add acid, control the pH value...

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Abstract

The invention belongs to the field of zinc hydrometallurgy, and particularly discloses a method for efficiently recycling copper and cadmium from copper and cadmium slag. The method comprises the following step (1) of ball milling; the step (2) of thickener solid-liquid separation, the step (3) of leaching, the step (4) of removal of iron and germanium, the step (5) of preparation of metal copper,and the step (6) of replacement of metal cadmium. The method for efficiently recycling the copper and the cadmium from the copper and cadmium slag is short in process period and high in efficiency, and the purity of enriched copper and cadmium metal is very high.

Description

technical field [0001] The invention belongs to the field of zinc hydrometallurgy, and specifically discloses a method for efficiently 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 main components in the copper cadmium slag are zinc, copper and cadmium in sequence. If the copper-cadmium slag is stockpiled, it will not only cause environmental burden, but also cause serious waste of resources. [0003] At present, the treatment process of copper cadmium slag produced in the impurity removal process of zinc smelting process is mainly divided into the following two types. (1) Separately establish a recovery system, focusi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/08C22B1/00C22B15/00C22B17/00
CPCC22B1/005C22B7/007C22B15/0071C22B15/0089C22B17/04Y02P10/20
Inventor 陈明珺谢永军刘年生王前华颜海军颜华荣颜雪梅胡旭东
Owner 衡阳市大宇锌业有限公司
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