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Method for leaching zinc in oxidation-sulfidation mixed zinc ore through ammonium chloride solution at high temperature and oxygen pressure

A technology of ammonium chloride solution and oxygen pressure leaching, which is applied in the field of leaching zinc from oxidation-sulfide mixed ore, which can solve the problems of low leaching efficiency and difficulty in handling zinc oxide ore, zinc sulfide ore, etc., to achieve inhibition of dissolution and improvement of binding capacity , the effect of enhanced binding ability

Inactive Publication Date: 2015-09-23
CENT SOUTH UNIV
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Problems solved by technology

[0003] Aiming at the problem that the traditional method for leaching zinc oxide minerals in the prior art is difficult to deal with zinc oxide ore symbiotic zinc sulfide ore, and the leaching efficiency is low, the purpose of the present invention is to provide a kind of ammonium chloride solution as a leaching agent, which can be used in A method for efficiently and selectively leaching zinc from oxidation-sulfide mixed ores under oxygen-enriched high-temperature conditions, the method is simple to operate, mild in conditions, and meets the requirements of industrial production

Method used

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  • Method for leaching zinc in oxidation-sulfidation mixed zinc ore through ammonium chloride solution at high temperature and oxygen pressure
  • Method for leaching zinc in oxidation-sulfidation mixed zinc ore through ammonium chloride solution at high temperature and oxygen pressure
  • Method for leaching zinc in oxidation-sulfidation mixed zinc ore through ammonium chloride solution at high temperature and oxygen pressure

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Embodiment 1

[0020] Take 100g of an oxidized-sulfurized mixed zinc ore (its composition is shown in Table 1 and its phase is shown in Table 2), mix 5mol / L ammonium chloride solution as a leaching agent, and add them together at a liquid-solid ratio of 5:1mL / g In the autoclave, the stirring speed is 300r / min, the oxygen partial pressure is 1.4Mpa, and the leaching time is 2h at a temperature of 135°C, and the leaching rate of zinc is 95.31%. figure 1 (A) and (B) are the XRD patterns of the raw ore and leaching residue at 135°C respectively. figure 1 It can be seen that the gangue impurities in the leaching slag are mainly SiO 2 , Fe 2 o 3 form exists.

[0021] Table 1 Analysis of chemical composition of oxide-zinc sulfide ore / %

[0022]

Embodiment 2

[0027] Take 100g of an oxidized-sulfurized mixed zinc ore (its composition is shown in Table 1 and its phase is shown in Table 2), mix 6mol / L ammonium chloride solution as a leaching agent, and add them together at a liquid-solid ratio of 10:1mL / g In the autoclave, the stirring speed is 300r / min, the oxygen partial pressure is 1.0Mpa, the leaching time is 3.0h at a temperature of 155°C, and the leaching rate of zinc is 97.37%.

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Abstract

The invention discloses a method for leaching zinc in oxidation-sulfidation mixed zinc ore through an ammonium chloride solution at high temperature and oxygen pressure. The method comprises the steps that in an autoclave, the nearly neutral ammonium chloride solution is adopted as a leaching agent, and the zinc in the oxidation-sulfidation mixed zinc ore is selectively leached under the conditions of the high temperature and oxygen enrichment. According to the method, the zinc in the oxidation-sulfidation mixed zinc ore can be selectively leached, the zinc is effectively separated from silicon, iron, calcium, magnesium and other impurity elements, and the problems that in a traditional acid leaching method, silica gel is easily generated, and acid consumption is large are solved. The problem that in the leaching process of an ammonia process and an ammonia-ammonium salt method, the leaching rate is low when calamine, willemite and other multiple mineral phases exist is solved. Meanwhile, the technical problem that acid leaching and ammonia leaching can be achieved only after oxidizing roasting is carried out on the oxidation-sulfidation mixed ore is solved. The method is especially suitable for treatment of the oxidation-sulfidation mixed zinc ore of high silicon, calcium, magnesium and 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 leaching zinc from oxidation-sulfide mixed ore. Background technique [0002] With the depletion of easy-to-treat high-grade zinc sulfide ores, difficult-to-treat low-grade complex sulfide ores, oxide ores and their mixed ores have gradually become raw materials for zinc extraction, but these ores are not suitable for mineral processing and pyrometallurgy. At the same time, it contains a large amount of impurity elements and alkaline gangue. If acid leaching is used, a large amount of silica gel will be generated during the leaching process, which will make solid-liquid separation difficult, and ores with high alkaline gangue will have a problem of high acid consumption and impurities. It will enter the solution and increase the burden of the impurity removal process. Although the neutralization flocculation method or the inhibi...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B19/00
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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