Method for selectively leaching voluble metal in copper refinery cinder

A technology for copper refining slag and valuable metals, which is applied in the fields of environmental protection and non-ferrous metallurgy, can solve the problems of incomplete leaching and poor filtration performance, and achieve the effects of good filtration performance, low cost and energy saving

Active Publication Date: 2010-01-06
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for selective leaching of valuable metals in copper refining slag, to solve the problems of incomplete leaching and poor filtration performance caused by colloids produced during the leaching process of copper smelting slag, and to achieve selective leaching of valuable metals in slag. Cobalt, zinc, copper to inhibit the leaching of silicon, iron

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  • Method for selectively leaching voluble metal in copper refinery cinder

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Embodiment 1

[0025] Slag I from African copper smelting contains 1.6% Cu, 1.2% Co, 6.7% Zn, 21% Fe, and 18% Si. Phase analysis shows that the slag metal is distributed in the form of ferrite and silicate. Grind the slag through a 100-mesh sieve, add 7kg of sodium chlorate per 100kg of slag, use 0.7mol / L sulfuric acid, control the liquid-solid ratio to 10:1, mechanically stir, the reaction temperature is 75°C, and the leaching reaction time is 3 hours. Calcium emulsion sizing, sizing time 3 hours, control end point pH 2.1, aging at 95°C for 0.5 hours, filtration, hot water washing, good filtration performance, copper, cobalt, zinc leaching rates were 90.1%, 98.2%, 98.1% %, the silicon and iron leaching rates are lower than 3.5%, 0.02%, and the slag yield is 216.4kg / 100kg slag.

Embodiment 2

[0027] The slag from African copper smelting II contains 15.4% Si, 28.4% Fe, 4.0% Co, 1.4% Cu, 1.7% Zn, Al3.22%, 0.05% Ni, the phase analysis of the slag metal is silicate, ferrite form exists. Grind the ore through an 80-mesh sieve, add 10kg of sodium chlorate per 100kg of slag, use 0.5mol / L sulfuric acid, liquid-solid ratio 15:1, mechanically stir, reaction temperature 95°C, leaching reaction time 2 hours, use calcium hydroxide Emulsion sizing, sizing time 2.5 hours, control end point pH value 1.9, aging at 95°C for 0.5 hours, filtration, hot water washing, good filtration performance, copper, cobalt, zinc leaching rates were 89.3%, 98.1%, 98.0% , The leaching rate of aluminum, silicon, and iron is lower than 31%, 3.3%, and 0.1%. The amount of slag produced is 186.3kg / 100kg slag.

[0028]It can be seen from the above examples that the method of adding sodium chlorate sulfuric acid system for leaching-calcium hydroxide emulsion and slurry adjustment can effectively leach val...

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Abstract

The invention provides a method for selectively leaching voluble metal in copper refinery cinder, which comprises the steps of crushing, acid fusion, size mixing and ageing, and the concrete steps are as follows: crushing and sieving the copper refinery cinder, and adding an oxidizer in slag; then stirring and leaching the mixture with 0.5-1.5 mol / L dilute sulphuric acid; after leaching, adding a size mixing agent which is calvital emulsion to neutralize excessive acid in the neutralization reaction; controlling the pH value of the reaction end point to 1.6-2.3; ageing the leaching agent; and carrying out filtering and washing to obtain filtrate containing the leached valuable metal. The method can effectively leach out copper, cobalt and zinc, inhibit the dissolution of silicon and ferrum to the maximum extent and obtain filter residue with favorable filtering performance. The method has simple and convenient size mixing scheme, less equipment investment, low raw material and small environment pollution, changes copper smelting waste residue into developable resources and has huge environment and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and non-ferrous metallurgy, and relates to a method for selectively leaching valuable metals from copper refining slag. The method can selectively leach valuable metals (cobalt, copper, zinc) while suppressing the leaching of silicon and iron therein . Background technique [0002] A large amount of waste slag containing a certain amount of valuable metals is produced in the pyrometallurgy process. The long-term accumulation of a large amount of waste slag will cause environmental pollution, and will also cause a huge waste of resources. The present invention is mainly aimed at the pyrometallurgy slag of African copper mines. The valuable metals in the slag, especially cobalt, are recovered by selective atmospheric pressure leaching. Cobalt is often associated with African copper mines, so copper pyro-smelting slag is rich in cobalt, and also contains a certain amount of zinc and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/08C22B23/00C22B19/30C22B15/00
CPCY02P10/20
Inventor 满瑞林张阳
Owner CENT SOUTH UNIV
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