A method for leaching copper from pickling copper slag in zinc hydrometallurgy

A technology of wet zinc smelting and pickling, applied in the field of leaching copper, can solve the problems of high cost, long process flow, difficulty in leaching copper, etc., and achieve the effect of low cost and small usage

Active Publication Date: 2022-01-04
ZHENGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a method for leaching copper from the pickling copper slag of zinc hydrometallurgy, in order to solve the problems of difficulty in leaching copper from the pickling copper slag, long process flow and high cost, and can realize Efficient and selective leaching and recovery of copper from pickling copper slag from zinc hydrometallurgy

Method used

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  • A method for leaching copper from pickling copper slag in zinc hydrometallurgy
  • A method for leaching copper from pickling copper slag in zinc hydrometallurgy
  • A method for leaching copper from pickling copper slag in zinc hydrometallurgy

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Embodiment 1

[0071] The pickling copper slag in this embodiment is the copper cadmium slag produced in the process of purifying the leaching liquid of the wet smelting zinc smelting process after pickling to remove zinc and cadmium. The copper content is 20%.

[0072] This embodiment provides a method for leaching copper from the pickling copper slag of zinc hydrometallurgy, comprising the following steps:

[0073] (1) Oxidation roasting: put the pickling copper slag into a high-temperature roasting furnace, and roast it for 30 minutes at 400° C. to oxidize the elemental copper in the pickling copper slag, and the copper oxidation rate is more than 80%;

[0074] (2) Grinding: crushing, grinding, and sieving the roasted pickling copper slag until the particles with a particle size of less than 0.074mm account for more than 90% of the mass to obtain the roasted slag to be processed;

[0075] (3) Alkaline leaching: the concentration of the glycine leaching agent is configured to be 50g / L, and...

Embodiment 2

[0080] The copper content in the pickling copper slag in this embodiment is 25%.

[0081] This embodiment provides a method for leaching copper from the pickling copper slag of zinc hydrometallurgy, comprising the following steps:

[0082] (1) Oxidation roasting: put the pickling copper slag into a high-temperature roasting furnace, and roast for 60 minutes at 450° C. to oxidize the elemental copper in the pickling copper slag, and the copper oxidation rate is more than 85%;

[0083] (2) Grinding: crushing, grinding, and sieving the roasted pickling copper slag until the particles with a particle size of less than 0.074mm account for more than 90% of the mass to obtain the roasted slag to be processed;

[0084] (3) 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 roasted slag to be treated at a liquid-soli...

Embodiment 3

[0089] The copper content in the pickling copper slag in this embodiment is 30%.

[0090] This embodiment provides a method for leaching copper from the pickling copper slag of zinc hydrometallurgy, comprising the following steps:

[0091] (1) Oxidation roasting: put the pickling copper slag into a high-temperature roasting furnace, and roast it for 90 minutes at 500° C. to oxidize the elemental copper in the pickling copper slag, and the copper oxidation rate is more than 90%;

[0092] (2) Grinding: crushing, grinding, and sieving the roasted pickling copper slag until the particles with a particle size of less than 0.074mm account for more than 90% of the mass to obtain the roasted slag to be processed;

[0093] (3) 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 configured glycine leaching agent with the roasted slag to be treated at a liquid-s...

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Abstract

The invention discloses a method for leaching copper from pickling copper slag of zinc hydrometallurgy, belongs to the technical field of copper recovery, and solves the existing problems of difficulty in leaching copper from pickling copper slag, long process flow and high cost. The method for leaching copper from the pickling copper slag of zinc hydrometallurgy comprises the following steps: putting the pickling copper slag into a roasting furnace to oxidize and roast to obtain the roasting slag; grinding and screening the roasting slag to obtain the roasting slag to be treated; Glycine leaching agent, adjust the pH of the leaching agent; mix the to-be-treated roasting slag with the leaching agent, selectively leach the copper in the to-be-treated roasting slag and filter to obtain the leaching solution and leaching residue; mix the leaching solution and oxalic acid solution for copper precipitation, and filter to obtain oxalic acid Copper precipitation and copper-precipitating liquid; wash the copper oxalate precipitation and put it into a high-temperature roasting furnace for thermal decomposition to obtain copper powder. After the copper powder 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, zinc and cadmium.

Description

technical field [0001] The invention belongs to the technical field of copper recovery, in particular to a method for leaching copper from pickling copper slag in zinc hydrometallurgy. Background technique [0002] Zinc hydrometallurgy is the main process of zinc smelting, accounting for more than 80% of the total zinc production. In the hydrometallurgy process, the zinc sulfate solution needs to be purified to remove copper, cadmium, cobalt, etc. before entering the zinc electrolysis process. Zinc powder is usually added in the purification and impurity removal process to replace copper, cadmium and other impurities in the zinc leaching solution. This process will produce a large amount of copper and cadmium slag, mainly containing elemental copper, cadmium sulfate, and elemental zinc. Every 10,000 tons of electric zinc produced produces about 1,300 tons of copper and cadmium slag, which is a relatively large output and has a very high comprehensive recovery value. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B3/16C22B1/02C22B15/00
CPCC22B7/04C22B7/007C22B15/0073C22B15/0089C22B1/02Y02P10/20
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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