Method for leaching copper from acid pickling copper slag for zinc hydrometallurgy

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

Active Publication Date: 2020-07-10
ZHENGZHOU UNIV
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  • Summary
  • 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 difficult...

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  • Method for leaching copper from acid pickling copper slag for zinc hydrometallurgy
  • Method for leaching copper from acid pickling copper slag for zinc hydrometallurgy
  • Method for leaching copper from acid pickling copper slag for zinc hydrometallurgy

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Embodiment 1

[0071] The pickling copper slag in this embodiment is the copper cadmium slag produced in the purification process of the hydro-zinc smelting leaching solution after pickling to remove zinc and cadmium, and the copper content is 20%.

[0072] This embodiment provides a method for leaching copper from pickling copper slag of hydro-zinc smelting, including the following steps:

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

[0074] (2) Grinding: crushing, grinding, and sieving the roasted pickled copper slag to a particle size of less than 0.074mm, which accounts for more than 90% of the mass to obtain the roasting slag to be processed;

[0075] (3) Alkaline leaching: configure the concentration of glycine leaching agent to be 50g / L, and adjust the pH of the leaching agent solution to 10 wit...

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 pickling copper slag of hydro-zinc smelting, including the following steps:

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

[0083] (2) Grinding: crushing, grinding, and sieving the roasted pickled copper slag to a particle size of less than 0.074mm, which accounts for more than 90% of the mass to obtain the roasting slag to be processed;

[0084] (3) 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 with the roasting residue to be treated at a liquid-to-solid ratio of 10:1 , Heated...

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 pickling copper slag of hydro-zinc smelting, including the following steps:

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

[0092] (2) Grinding: crushing, grinding, and sieving the roasted pickled copper slag to a particle size of less than 0.074mm, which accounts for more than 90% of the mass to obtain the roasting slag to be processed;

[0093] (3) Alkaline leaching: configure the concentration of glycine leaching agent to be 150g / L, and adjust the pH of the leaching agent solution to 11 with sodium hydroxide solution; mix the configured glycine leaching agent with the roasting residue to be treated at a liquid-solid ratio of 15:1 , Heated t...

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Abstract

The invention discloses a method for leaching copper from acid pickling copper slag for zinc hydrometallurgy, and belongs to the technical field of copper recovery. The problems that in the prior art,the copper is difficultly leached from the acid pickling copper slag, the technological process is long, and the cost is high are solved. The method for leaching the copper from the acid pickling copper slag for zinc hydrometallurgy includes the following steps that the acid pickling copper slag is put in a calcinator to be subjected to oxidation roasting, and calcined slag is obtained; the calcined slag is ore-ground and screened, and to-be-treated calcined slag is obtained; a glycine leaching agent is prepared, and the pH value of the leaching agent is adjusted; the to-be-treated calcined slag and the leaching agent are mixed, the copper in the to-be-treated calcined slag is selectively leached, and leachate and leaching residues are obtained through filtering; the leachate and an oxalic acid solution are mixed, and copper oxalate precipitates and liquid obtained after copper precipitation are obtained through filtering; and the copper oxalate precipitates are washed and then put ina high-temperature calcinator, heating decomposition is carried out, copper powder is obtained, the copper powder is washed with dilute acid, subjected to impurity removal and dried, and then high-purity copper powder is obtained. By means of the method, the copper, zinc and cadmium are effectively separated.

Description

Technical field [0001] The invention belongs to the technical field of copper recovery, and particularly relates to a method for leaching copper from pickling copper slag of hydro-zinc smelting. Background technique [0002] Zinc hydrometallurgy is the main process of zinc smelting, accounting for more than 80% of total zinc output. In the process of wet zinc smelting, the zinc sulfate solution needs to be purified to remove copper, cadmium, cobalt, etc. before it can enter the zinc electrolysis process. In the purification process, zinc powder is usually added to replace copper, cadmium and other impurities in the zinc leaching solution. This process will produce a large amount of copper cadmium slag, mainly containing elemental copper, cadmium sulfate, elemental zinc, etc. For every 10,000 tons of electric zinc produced, about 1,300 tons of copper-cadmium slag is produced, which is relatively large and has a high comprehensive recovery value. At present, the copper cadmium sl...

Claims

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Application Information

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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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