Leaching method of zinc sulfide concentrates

A zinc sulfide concentrate and leaching technology, applied in the field of wastewater treatment, can solve the problems of long treatment time, cumbersome steps and many steps, and achieve the effects of short leaching time, simple process and high leaching rate

Active Publication Date: 2018-12-18
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

Chinese patent CN104004923B discloses a method for extracting zinc by combining roasting leaching and direct leaching of zinc sulfide concentrate, through three control steps, leaching 1.0~1.5h, 1.5~2.0h and 2.0~2.5h respectively, without traditional The iron removal process improves the recovery rate of zinc and reduces the zinc content of iron slag, but there are many steps and long processing time
Chinese patent CN105969999A discloses a method for leaching zinc sulfide concentrates. The leaching process is completed through the steps of leaching, cooling, filtering, heat exchange, mixing, leaching, adding oxidants and neutralizers, and filtering, but the steps are cumbersome and the Need to operate more

Method used

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Effect test

Embodiment 1

[0020] Embodiment 1: the grade of zinc in the zinc sulfide concentrate in this embodiment is 30%, and the mass percentage content of iron is 10%;

[0021] A kind of leaching method of zinc sulfide concentrate, concrete steps are:

[0022] Add water, excess oxidant (oxygen), zinc sulfide concentrate, and sulfur-containing additives (sulfuric acid) into the high-temperature and high-pressure reactor to obtain a reaction system. Under airtight conditions, the temperature and pressure of the reaction system in the high-temperature and high-pressure reactor are The reaction system reached the supercritical state, and reacted for 30 minutes to obtain the reaction product system, cooled to room temperature, and separated the solid-liquid phase to obtain the zinc-containing leaching solution and iron-containing oxide leaching residue; the temperature of the supercritical state was 380°C, the pressure was 40Mpa, and the sulfur-containing The molar ratio of sulfur atoms in additive (sul...

Embodiment 2

[0024] Embodiment 2: the grade of zinc in the zinc sulfide concentrate in this embodiment is 35%, and the mass percentage content of iron is 12%;

[0025] A kind of leaching method of zinc sulfide concentrate, concrete steps are:

[0026] Add water, excess oxidant (ozone), zinc sulfide concentrate, sulfur-containing additive (elemental sulfur) and dispersant (sodium lignosulfonate) into a high-temperature and high-pressure reactor to obtain a reaction system. The reaction system in the high-pressure reactor is heated and pressurized until the reaction system reaches a supercritical state, and reacted for 30 minutes to obtain a reaction product system, cooled to room temperature, and the solid-liquid phase is separated to obtain a zinc-containing leachate and an iron-containing oxide leaching residue; the supercritical state The temperature is 380°C, the pressure is 35Mpa, the molar ratio of sulfur atoms in sulfur-containing additives (elemental sulfur) to zinc atoms in zinc su...

Embodiment 3

[0028] Embodiment 3: the grade of zinc in the zinc sulfide concentrate in this embodiment is 38%, and the mass percentage content of iron is 12%;

[0029] A kind of leaching method of zinc sulfide concentrate, concrete steps are:

[0030] Add water, excess oxidant (hydrogen peroxide), zinc sulfide concentrate, and sulfur-containing additives (sulfur dioxide) into a high-temperature and high-pressure reactor to obtain a reaction system. Under airtight conditions, the temperature and pressure of the reaction system in the high-temperature and high-pressure reactor are The reaction system reaches a supercritical state, and reacts for 60 minutes to obtain a reaction product system, cools to room temperature, and separates the solid-liquid phase to obtain a zinc-containing leaching solution and an iron-containing oxide leaching residue; the temperature of the supercritical state is 460°C, the pressure is 30Mpa, and the sulfur-containing The molar ratio of sulfur atoms in the additi...

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Abstract

The invention relates to a leaching method of zinc sulfide concentrates, and belongs to the field of wet metallurgy. Water, an oxidizing agent, the zinc sulfide concentrates, additives and a dispersing agent are added in a high-temperature and high-pressure reaction kettle to obtain a reaction system; under the condition of tightness, the reaction system in the high-temperature and high-pressure reaction kettle is heated and pressurized to reach a supercritical state, is reacted by 10-60 min to obtain a reaction product system, and is cooled to reach the room temperature; the solid/liquid-phase separation is performed to obtain zinc-contained leaching liquid and iron-contained oxide leaching slag; the additives are sulfur-contained additives or nitrogen-contained additives; the temperaturein the supercritical state is 380-500 DEG C; and the pressure is 22.5-40 Mpa. The zinc sulfide concentrates are leached by using supercritical water; and high zinc leaching rate and the deposition ofsuch metal as iron, copper and manganese can be realized at the same time.

Description

technical field [0001] The invention relates to a method for leaching zinc sulfide concentrate, which belongs to the field of waste water treatment. Background technique [0002] my country is a big consumer of zinc. In economic construction, it is mainly consumed in galvanizing, zinc alloy, zinc-manganese battery, copper alloy and other industries. In nature, zinc mainly exists in the form of sulfide, and about 90% of zinc is produced. Zinc smelting is divided into pyro-smelting and hydro-smelting, of which hydro-smelting is the leading smelting technology and method. Hydrometallurgy is divided into ionic liquid metallurgy, pressurized hydrometallurgy, microbial hydrometallurgy, selective chlorination leaching, and membrane separation technology, among which pressurized hydrometallurgy is the most widely studied and most widely used hydrometallurgical technology. [0003] Chinese patent CN102417979B discloses a treatment method for zinc sulfide concentrate, which utilizes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B3/04C22B3/08C22B3/14C22B19/20
CPCC22B3/04C22B3/065C22B3/08C22B3/14C22B19/22C22B19/24Y02P10/20
Inventor 田森林张月超李英杰黄建洪胡学伟宁平谷俊杰关清卿
Owner KUNMING UNIV OF SCI & TECH
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