Method for leaching copper from tin-copper slag

A leaching and tin-copper technology, applied in the field of leaching copper from tin-copper slag, can solve the problems of difficulty in leaching copper, high cost, long process flow, etc., and achieve the effect of low cost, small usage, and separation

Active Publication Date: 2020-07-28
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the above analysis, the present invention aims to provide a method for leaching copper from tin-copper slag, in order to solve the problems of difficulty i...

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  • Method for leaching copper from tin-copper slag

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Embodiment 1

[0066] The copper content in the tin-copper slag in this embodiment is 10%.

[0067] The present embodiment provides a kind of method for leaching copper from tin-copper slag, comprises the following steps:

[0068] (1) Grinding: crushing, grinding, and sieving the tin-copper slag until the particles with a particle size of less than 0.074mm account for more than 95% of the mass, and obtain the slag to be processed;

[0069] (2) Alkaline leaching: configure the concentration of glycine leaching agent to be 50g / L, use sodium hydroxide solution to adjust the pH of the leaching agent solution to 10; mix the configured glycine leaching agent with the slag to be treated at a liquid-solid ratio of 5:1, Heating to 40°C, leaching for 1 hour under mechanical stirring at 50 rpm, the copper leaching rate reaches 70%; filter the leaching pulp with a plate and frame filter device to obtain copper-containing leaching solution and leaching slag;

[0070] (3) Copper precipitation with oxalic...

Embodiment 2

[0074] The copper content in the tin-copper slag in this embodiment is 20%.

[0075] The present embodiment provides a kind of method for leaching copper from tin-copper slag, comprises the following steps:

[0076] (1) Grinding: crushing, grinding, and sieving the tin-copper slag until the particles with a particle size of less than 0.074mm account for more than 90% of the mass, and obtain the slag to be processed;

[0077] (2) Alkaline leaching: configure the concentration of glycine leaching agent to be 100g / L, use sodium hydroxide solution to adjust the pH of the leaching agent solution to 10.5; mix the prepared glycine leaching agent with the treatment residue at a liquid-solid ratio of 10:1, and heat To 60°C, leaching for 5 hours under mechanical stirring at 100 rpm, the copper leaching rate reaches 80%; use a plate and frame filter device to filter the leaching pulp to obtain copper-containing leaching solution and leaching slag;

[0078] (3) Copper precipitation with ...

Embodiment 3

[0082] The copper content in the tin-copper slag in this embodiment is 30%.

[0083] The present embodiment provides a kind of method for leaching copper from tin-copper slag, comprises the following steps:

[0084] (1) Grinding: crushing, grinding, and sieving the tin-copper slag until the particles with a particle size of less than 0.074mm account for more than 90% of the mass, and obtain the slag to be processed;

[0085] (2) Alkaline leaching: configure the concentration of glycine leaching agent to be 150g / L, use sodium hydroxide solution to adjust the pH of the leaching agent solution to 11; mix the prepared glycine leaching agent with the slag to be treated at a liquid-solid ratio of 15:1, Heating to 75°C, leaching for 15 hours under mechanical stirring at 200 rpm, the copper leaching rate reaches 90%; filter the leaching pulp with a plate and frame filter device to obtain copper-containing leaching solution and leaching slag;

[0086] (3) Copper precipitation with oxa...

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Abstract

The invention discloses a method for leaching copper from tin-copper slag, belongs to the technical field of copper recovery, and solves the existing problems that it is difficult to leach copper fromtin-copper slag, the technological process is long and the cost is high. The method for leaching copper from the tin-copper slag includes the following steps: grinding and sieving the tin-copper slagto obtain to-be-treated slag; preparing a glycine leaching agent, and regulating the pH of the leaching agent with an alkaline solution; mixing the to-be-treated slag with the leaching agent to selectively leach copper in the to-be-treated slag, and performing filtration to obtain leaching liquor and leaching slag; mixing the leaching liquor with an oxalic acid solution for copper precipitation,and performing filtration to obtain copper oxalate precipitate and post-copper-precipitation liquor; washing the copper oxalate precipitate, and putting the copper oxalate precipitate into a high-temperature roasting furnace for thermal decomposition to obtain copper powder; and washing the copper powder obtained in step 5 with dilute acid, removing impurities, and drying the copper powder to obtain high-purity copper powder. The method effectively realizes copper-tin separation and high-value recovery of copper.

Description

technical field [0001] The invention belongs to the technical field of copper recovery, in particular to a method for leaching copper from tin-copper slag. Background technique [0002] In the process of tin smelting, the copper content in crude tin obtained by reduction smelting of tin concentrate is relatively high, which needs to be refined by adding sulfur to remove copper, and the copper content in the formed copper-containing refining slag is generally between 10% and 40%, which is called Tin-copper slag has high economic value. Among them, copper mainly exists in the form of sulfide (Cu 2 S), tin exists in the form of metal element and oxide. [0003] At present, the treatment methods of such tin-copper slag mainly include the following types: [0004] (1) Diaphragm electrolysis method: This method uses tin-copper slag as the anode, fine tin as the cathode, and fluorosilicic acid as the electrolyte for electrolysis. During the electrolysis process, tin, lead, etc....

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B15/00
CPCC22B7/04C22B7/008C22B15/0089C22B15/0065Y02P10/20
Inventor 曹亦俊黄宇坤范桂侠彭伟军李超李国胜
Owner ZHENGZHOU UNIV
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