A method for leaching copper from tin-copper slag

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

Active Publication Date: 2022-06-07
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 in leaching copper from tin-copper slag, long process flow, high cost, etc., and can realize the efficient extraction of copper in tin-copper slag. Selective Leaching and Recovery

Method used

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  • A method for leaching copper from tin-copper slag
  • A method for leaching copper from tin-copper slag

Examples

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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 method for leaching copper from tin-copper slag, comprising the following steps:

[0068] (1) Grinding: the tin-copper slag is crushed, ground, and sieved to a particle size of less than 0.074mm that accounts for more than 95% of the mass to obtain the slag to be treated;

[0069] (2) Alkaline leaching: The concentration of glycine leaching agent is configured to be 50g / L, and the pH of the leaching agent solution is adjusted to 10 by using sodium hydroxide solution; Heating to 40°C, leaching for 1 hour under mechanical stirring at 50 rpm, the copper leaching rate reaches 70%; the leaching pulp is filtered with a plate and frame filter device to obtain copper-containing leaching solution and leaching slag;

[0070] (3) oxalic acid copper precipitation: the above-mentioned copper-containing leaching solution is neutralized with 200g / L oxalic acid solution, and...

Embodiment 2

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

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

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

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

[0078] (3) oxalic acid copper precipitatio...

Embodiment 3

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

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

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

[0085] (2) Alkaline leaching: the concentration of glycine leaching agent is configured to be 150g / L, and the pH of the leaching agent solution is adjusted to 11 by using sodium hydroxide solution; Heating to 75°C, leaching for 15h under mechanical stirring at 200 rpm, the copper leaching rate reaches 90%; the leaching pulp is filtered with a plate and frame filter device to obtain copper-containing leaching solution and leaching slag;

[0086] (3) oxalic acid copper precipitation: the above-mentioned copper-containing leaching solution is neutralized with 300g / L oxalic ...

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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 of difficulty in leaching copper from tin-copper slag, long process flow and high cost. The method for leaching copper from tin-copper slag comprises the following steps: grinding and screening the tin-copper slag to obtain the slag to be treated; configuring a glycine leaching agent, and adjusting the pH of the leaching agent with an alkaline solution; Mixing agent, selectively leaching the copper in the slag to be treated, filtering to obtain the leaching solution and leaching slag; mixing the leaching solution and oxalic acid solution for copper precipitation, filtering to obtain copper oxalate precipitation and copper precipitation solution; washing the copper oxalate precipitation and putting it in high temperature A roasting furnace is used to heat and decompose to obtain copper powder; after the copper powder in step 5 is washed with dilute acid, impurities are removed and dried, high-purity copper powder is obtained. The method of the invention effectively realizes the separation of copper and tin and the 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 crude tin obtained by reduction smelting of tin concentrate contains high copper content, and it needs to be refined by adding sulfur to remove copper. 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: [0004] (1) Diaphragm electrolysis method: This method uses tin-copper slag as anode, refined tin as cathode, and fluorosilicic acid as electrolyte for electrolysis. During the electrolysis process, tin, lead, etc. in the tin-copper slag are dissolved at the anode and deposited at the cathode; while copper, antimony, etc. in the tin-copper slag remain i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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