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Method for selectively leaching zinc in complex zinc oxide materials at high temperature by adopting ammonium chloride solution

A technology of ammonium chloride solution and zinc oxide, which is applied in the field of zinc extraction by non-ferrous metallurgy hydrometallurgy, can solve the problems of difficult to deal with complex zinc oxide ore of heteropolar ore, and achieve the effect of improving binding ability and inhibiting dissolution.

Inactive Publication Date: 2015-09-23
CENT SOUTH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] Aiming at the problem that it is difficult to process complex zinc oxide ores such as hemimorphite, willemite, zinc ferrite, etc. in the traditional method for processing zinc minerals in the prior art, the purpose of the present invention is to provide a kind of neutral ammonium chloride solution As a leaching agent, it is a method for efficiently and selectively leaching zinc from complex zinc oxide materials under high temperature conditions. This method is simple to operate, mild in conditions, and easy to meet the requirements of industrial production.

Method used

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  • Method for selectively leaching zinc in complex zinc oxide materials at high temperature by adopting ammonium chloride solution
  • Method for selectively leaching zinc in complex zinc oxide materials at high temperature by adopting ammonium chloride solution
  • Method for selectively leaching zinc in complex zinc oxide materials at high temperature by adopting ammonium chloride solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take 200g of a certain low-grade zinc oxide ore (its composition is shown in Table 1 and its phase is shown in Table 2), mixed with 5mol / L ammonium chloride solution as the leaching agent, and add them together to the high pressure at a liquid-solid ratio of 5:1mL / g In the kettle, the stirring speed is 300r / min, the leaching time is 1h at a temperature of 150°C, and the leaching rate of zinc is 94.83%. figure 1 (A) and (B) are the XRD patterns of the mine and the leaching slag at 150°C respectively. The gangue impurities in the leaching slag are mainly SiO 2 , CaCO 3 composition.

[0023] Table 1 Zinc oxide ore chemical composition analysis / %

[0024]

[0025] Table 2 Zinc Oxide Zinc Phase Analysis / %

[0026]

Embodiment 2

[0031] Take 200g of a certain low-grade zinc oxide ore (its composition is shown in Table 1 and its phase is shown in Table 2), mixed with 5mol / L ammonium chloride solution as the leaching agent, and add them together to the high pressure at a liquid-solid ratio of 5:1mL / g In the kettle, the stirring speed is 500r / min, the leaching time is 5h at a temperature of 110°C, and the leaching rate of zinc is 92.19%.

Embodiment 3

[0036] Take 200g of zinc silicate (the composition is shown in Table 3), mix 6mol / L ammonium chloride solution as leaching agent 1000mL, put them into the autoclave together, stir at 700r / min, and leaching time at 140°C for 1h, zinc The leaching rate is 96.87%, image 3 (E), (F) are the XRD patterns of zinc silicate and its leaching residue. It can be seen from the figure that zinc silicate, which is difficult to be leached by ammonia method and ammonia-ammonium salt method, can be leached in this system.

[0037] Table 3 Elemental analysis results of zinc silicate / %

[0038]

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Abstract

The invention discloses a method for selectively leaching zinc in complex zinc oxide materials at high temperature by adopting an ammonium chloride solution. According to the method, the zinc in the complex zinc oxide materials is selectively leached at the high temperature by taking the neutral ammonium chloride solution as a leaching agent in a sealed container; the zinc in the complex zinc oxide materials can be selectively leached, the zinc leaching rate is higher than 90 percent, and the effective separation of the zinc from impurity elements such as silicon, iron, calcium and magnesium is achieved; the problems that silica gel is prone to being generated and the acid consumption is large in the traditional acid leaching process of the complex zinc oxide materials are solved; the problem that the zinc leaching rate is low when an ammonium hydroxide and ammonia-ammonium salt method is used to leach complex zinc oxide ore especially containing ore phases such as willemite, hemimorphite and iron-zinc ore is solved; the method is specially suitable for processing the complex zinc oxide materials containing high silicon, the calcium, the magnesium and the iron.

Description

technical field [0001] The invention relates to a method for extracting zinc by nonferrous metallurgical wet smelting, in particular to a method for selectively leaching zinc from highly alkaline gangue and multi-phase complex zinc oxide materials. Background technique [0002] Zinc oxide reserves in my country are abundant, and the main characteristics are low grade, difficult to separate, high silicon, high alkali gangue, and the composition of zinc-containing minerals is complex, mainly containing smithsonite, hydrozinsite, hemimorphite, willemite and iron A variety of refractory zinc resources such as acid zinc ore. The treatment of zinc oxide ore is divided into fire method and wet method. The fire method is gradually eliminated due to low metal recovery rate, high energy consumption and serious environmental pollution. Wet treatment mainly includes acid leaching, alkali leaching and ammonia leaching and other processes. During the acid leaching process, solid-liquid s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/14C22B19/00
CPCY02P10/20
Inventor 杨声海李浩王长红孙彦伟陈永明何静唐朝波杨建广
Owner CENT SOUTH UNIV
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