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Method for simultaneously recovering copper and sulfur from tin refining sulfur slag through oxygen pressure leaching

A technology of oxygen pressure leaching and recovery of copper, which is applied in the field of tin smelting, can solve the problem that sulfur has not been recycled, and achieve the effects of reducing environmental protection treatment costs, shortening reaction time, and efficient recovery

Active Publication Date: 2020-08-21
YUNNAN TIN CO LTD TIN BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there has never been a high-efficiency, energy-saving, clean, and environmentally friendly process that has been recognized by major tin smelters, especially the sulfur in sulfur slag has not been effectively recycled, and the treatment of sulfur slag is still a difficult problem in the tin smelting process

Method used

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  • Method for simultaneously recovering copper and sulfur from tin refining sulfur slag through oxygen pressure leaching

Examples

Experimental program
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Effect test

Embodiment 1

[0018] refer to figure 1 The process flow shown is a method for simultaneously recovering copper and sulfur by oxygen pressure leaching of tin refining sulfur slag. The tin refining sulfur slag is refining slag produced by adding sulfur and removing copper during crude tin refining. The specific method steps are as follows:

[0019] (1) First, in the stirring tank, the sulfur slag that contains 60% tin, 15% copper, and 8% sulfur (the remainder is impurities) will be mixed with dilute sulfuric acid at a liquid-solid mass ratio of 5:1 after being ground, and the initial concentration of sulfuric acid is 80g / L, then add iron powder equivalent to 8% of the mass of sulfur slag as a catalyst to prepare a slurry, and then use an acid-resistant pump to pump the slurry into the oxygen pressure reactor;

[0020] (2) After sealing the feed port of the oxygen autoclave, pressurize the oxygen autoclave with industrial pure oxygen through the oxygen tube of the oxygen autoclave to an oxyge...

Embodiment 2

[0026] A method for simultaneously recovering copper and sulfur by oxygen pressure leaching of sulfur slag from tin refining, wherein the sulfur slag from tin refining is refining slag produced by adding sulfur and removing copper during crude tin refining. The specific method steps are as follows:

[0027] (1) First, in the stirring tank, the sulfur slag containing 70% tin, 20% copper, and 7% sulfur (the remainder is various impurities) after grinding is mixed with dilute sulfuric acid at a liquid-solid mass ratio of 6:1, and the sulfuric acid is initially The concentration is 90g / L, and iron powder equivalent to 10% of the mass of sulfur slag is added as a catalyst to prepare a slurry, and then the slurry is pumped into the oxygen pressure reactor with an acid-resistant pump;

[0028] (2) After sealing the feed port of the oxygen autoclave, use industrial pure oxygen to pressurize to the oxygen partial pressure of 3MPa through the oxygen tube of the oxygen autoclave, and use...

Embodiment 3

[0033] A method for simultaneously recovering copper and sulfur by oxygen pressure leaching of sulfur slag from tin refining, wherein the sulfur slag from tin refining is refining slag produced by adding sulfur and removing copper during crude tin refining. The specific method steps are as follows:

[0034] (1) First, in the stirring tank, the sulfur slag containing 50% tin, 18% copper, and 10% sulfur (the rest are impurities) will be mixed with dilute sulfuric acid at a liquid-solid mass ratio of 3:1 after being ground, and the initial concentration of sulfuric acid is 60g / L, then add iron powder equivalent to 2% of the mass of sulfur slag as a catalyst to prepare a slurry, and then use an acid-resistant pump to pump the slurry into the oxygen pressure reactor;

[0035] (2) After sealing the feed port of the oxygen autoclave, use industrial pure oxygen to pressurize to an oxygen partial pressure of 2.5MPa through the oxygen tube of the oxygen autoclave, and use high-temperatu...

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Abstract

The invention relates to a method for simultaneously recovering copper and sulfur from tin refining sulfur slag through oxygen pressure leaching. The method comprises the following steps: grinding sulfur slag containing, by mass, 50-70% of tin, 10-20% of copper and 7-10% of sulfur, mixing the sulfur slag with dilute sulfuric acid in a liquid-solid mass ratio of (3-6):1, adding iron powder accounting for 2-10% of the mass of the sulfur slag, adding the resulting mixture into an oxygen pressure reaction kettle for leaching at 200-240 DEG C for 2-4 h under the oxygen partial pressure is 1.5-3 MPa, and then conducting filtering to obtain leaching residues and a copper sulfate solution; and washing the leaching residues with water, performing filtering to obtain a copper-removed sulfur-removedtin-removed concentrate product, and concentrating and crystallizing the copper sulfate solution to obtain copper sulfate. According to the method, by changing oxygen pressure leaching process conditions and adding a catalyst, the tin concentrate with copper and sulfur removed is obtained after one-time oxygen pressure leaching and used for the tin smelting procedure, and copper and sulfur are recycled in the form of copper sulfate. The method is simple, the recycling cost is low, energy is saved, and environment protection is achieved.

Description

technical field [0001] The invention belongs to the technical field of tin smelting, and in particular relates to a treatment method for intermediate slag in tin smelting. Background technique [0002] In tin smelting technology, many different treatment processes have been developed for the treatment of sulfur slag, such as diaphragm electrolysis-oxidation roasting-acid leaching process, flotation-oxidation roasting-leaching process, and chlorination method to directly treat sulfur slag. Industrial tin tetrachloride process, stannous sulfide produced by vacuum distillation, copper sulfate produced by direct oxygen pressure leaching, etc. However, there has never been a high-efficiency, energy-saving, clean, and environmentally friendly process that has been recognized by major tin smelters, especially the sulfur in sulfur slag has not been effectively recycled, and the treatment of sulfur slag is still a difficult problem in the tin smelting process . Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B15/00C01G3/10
CPCC22B7/04C22B7/007C22B15/0071C01G3/10Y02P10/20
Inventor 张璋杨从兴杨成林宋兴诚王红彬陈云苏瑞春李发祥黄迎红李鹏程彭文彩
Owner YUNNAN TIN CO LTD TIN BRANCH