Method for extracting indium from indium-rich smoke dust by using oxygen pressure technology

A soot and indium-rich technology, which is applied in the direction of improving process efficiency, can solve the problem of low yield of indium extraction, and achieve the effects of high direct yield of indium, good promotion value, and strong adaptability of raw materials

Active Publication Date: 2012-07-04
CHENZHOU CITY JINGUI SILVER IND CO LTD
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Problems solved by technology

[0005] In order to solve the problem of low yield of indium extraction from the indium-rich dust produced in the smelting process of heavy non-ferrous metals, the present invention provides a method for extracting indium from the indium-rich dust by oxygen pressure, which uses oxygen pressure technology to extract indium by acid leaching , the process operation is simple, practical, efficient and clean, which not only significantly improves the leaching recovery rate of indium in the indium-rich fume, but also solves the problems of complex control of the leaching process, low enrichment rate of valuable metals, and large loss in conventional processes. It completely eliminates the harm of acid mist to the environment, and achieves the purpose of resource synthesis, recycling, high-efficiency utilization and green metallurgy

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  • Method for extracting indium from indium-rich smoke dust by using oxygen pressure technology

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Lead electrolysis dross is fumed to enrich indium soot composition (wt,%): In 11.44, Zn 2.06, Pb24.86, Fe 0.33, As 0.89, Sb 1.45.

[0052] Take 150Kg of the above-mentioned raw material, grind the sample preparation until the particle size is 120 mesh, add 10% H 2 SO 4 The solution was mixed and placed in a closed high-pressure reactor, and the control conditions were: reaction temperature 160°C, reaction oxygen pressure 0.6MPa, reaction time 4.0h; after the reaction, the reactor was cooled and opened safely after pressure release, and the slurry Liquid-solid separation is carried out, the filter residue is washed once with hot water at 80°C, and then returned to the lead recovery system for treatment, and the filtrate is sent for impurity removal and extraction. The filter residue was sampled and analyzed: 0.014% indium, 68.18% lead, 2.63% tin; filtrate: 0.426g / L indium, 0.020g / L lead, 3.35g / L zinc. In the leaching reaction, the In leaching rate is 97.31%, the Sn lea...

Embodiment 2

[0058] The raw material composition of indium-rich soot of lead-tin reverberatory furnace is (wt,%): In 0.287, Zn 1.36, Pb16.71, Fe 0.89, As 1.91, Sb 0.64, SiO 2 5.65, Cd 0.32, Sn 7.62.

[0059] Take 1Kg of the raw material that has been pulverized and prepared to a particle size of 120 mesh, and add H with a mass percentage concentration of 30% according to the liquid-solid ratio of 4:1. 2 SO 4 The solution was mixed and placed in a closed high-pressure reactor, and the reaction conditions were controlled as follows: reaction temperature 120°C, reaction oxygen pressure 0.8Mpa, reaction time 2h; after the reaction was completed, the reactor was cooled, and the pressure was released, and the material was safely opened. The slurry was separated from liquid to solid, and the filter residue was washed twice with hot water at 70°C, weighed and analyzed. The slag contains 0.008% indium, 56.38% lead, and 35.06% tin; the filtrate contains 0.48g / L indium and 0.012g / L lead. Based on ...

Embodiment 3

[0063] Get 200Kg of the raw materials used in Example 1, sample preparation and pulverization to a particle size of 110 mesh, add 15% H in mass percent concentration according to the reaction liquid-solid ratio 5:1 2 SO 4 The solution was slurried and placed in a closed titanium autoclave. The reaction control conditions were: temperature 180°C, oxygen pressure 1.5MPa, time 3h; after the reaction, the reaction kettle was cooled, and the pressure was released, and the slurry was liquid-solidified. Separation, the filter residue is washed twice with hot water at 80°C, and then returned to the lead recovery system for processing, and the filtrate is sent for impurity removal and extraction. The filter residue was sampled and analyzed: 0.012% indium, 55.67% lead, 34.86% tin; filtrate: 0.457g / L indium, 0.014g / L lead, 1.35g / L zinc. In the leaching reaction, the In leaching rate is 97.48%, the Sn leaching rate is 0.95%, the Pb leaching rate is 0.41%, and the Zn leaching rate is 98.3...

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Abstract

The invention provides a method for extracting indium from indium-rich smoke dust by using an oxygen pressure technology. The method is characterized by comprising the following steps of: carrying out leaching indium extraction of the difficult-to-handle indium-rich smoke dust of a Pb-Sn reverberatory furnace by adopting a wet-process metallurgical oxygen pressure acid leaching technology, and highly enriching and recycling valuable metals in the raw material; and purifying to remove impurities of leachate, and carrying out extraction, replacement and electrolytic refining, thereby obtaining greater than 99.995% of electrical indium products. The technology method has the advantages that the indium leaching rate of the indium-rich smoke dust of the Pb-Sb reverberatory furnace and the enrichment rate of the valuable metals can be obviously increased, and the comprehensive recycling effect can be achieved, thereby waster water of indium smelting can be discharged up to the standard after being processed with low cost, the environmental pollution in the indium extraction process is eliminated. In the process, the leaching rate of the indium is more than 97%, leaching residues containless than 0.01% of indium, the enrichment rate of plumbum, tin, bismuth and zinc is more than 98%, the quality of refined indium products is more than 99.995%, and plumbum enriching slag containing greater than 60% of Pd is obtained. The technical scheme can independently form a system, can also be used for improving and perfecting old technologies and has higher popularization and application value.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of non-ferrous metals, and relates to a process for extracting metal indium by oxygen pressure technology, in particular to a method for extracting indium from indium-rich dust by oxygen pressure. Background technique [0002] Indium is a rare element, its content is rare in the earth's crust and its distribution is very scattered, and no independent mineralization has been found in nature. Usually indium is mainly associated with heavy non-ferrous metals such as copper, lead, zinc, tin and other minerals, especially sphalerite, chalcopyrite, kesterite and galena; therefore, it is extracted and recovered from the heavy non-ferrous metal smelting process Indium has become an important source of indium. Due to the special physical and chemical properties of indium, it is widely used in the electronics and semiconductor industries, especially the ITO target industry has accounted for more than 70% of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B3/08C22B58/00
CPCY02P10/20
Inventor 李栋曹永贵曹永德杨跃新
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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