A comprehensive recovery method for high-arsenic and multi-metal indium-containing materials

Abstract

The invention discloses a comprehensive recovery method for high-arsenic multi-metal indium-containing materials. The method comprises the following steps: (1) adding the high-arsenic multi-metal indium-containing materials, reducing agents and flux ingredients to an oxygen-enriched side blowing furnace for reduction smelting, and matte, lead-bismuth alloy, smelting flue gas and reducing slag areobtained; (2) mixing the smelting flue gas with air for oxidizing and cooling, and then performing electric dust collection to obtain primary solid soot and primary arsenic-containing flue gas; (3) filtering the primary arsenic-containing flue gas through an intermetallic compound flexible membrane to obtain secondary solid soot and secondary arsenic-containing flue gas; (4) shock chilling the secondary arsenic-containing flue gas to collect arsenic to obtain As2O3 and tail gas, mixing the primary solid soot and the secondary solid soot for oxygen pressure leaching, and extracting the obtainedleachate to recover indium; and (5) feeding raffinate obtained by the extraction process back to the extraction process for recycling. The arsenic and indium recovery rate is high, and the method hasthe advantages of high efficiency, environmental protection, safety and the like.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of nonferrous metals, and in particular relates to a comprehensive recovery method for high-arsenic and multi-metal indium-containing materials. Background technique [0002] In the deposits of non-ferrous metals such as copper, lead and zinc, arsenic is the main associated element. During the smelting process, arsenic will be enriched with the smelting metal (the amount of arsenic produced by copper smelters is 32500t / a, and that of lead smelters is 16100t / a a, the zinc smelter is 22400t / a), forming high-arsenic polymetallic materials (when the mass percentage of arsenic in the material is ≥ 2%, the material is called high-arsenic material). The arsenic in copper concentrate is mainly concentrated in the smelting soot after complex smelting process, forming high-arsenic soot. These high-arsenic soot is rich in valuable metals and has a high recovery value. However, the presence of ...

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Problems solved by technology

[0004] (1) It is difficult to completely capture arsenic-containing smoke and dust, and it is easy to produce secondary pollution

There is no corresponding equipment and facilities to capture arsenic, and the arsenic compound is directly volatilized into the flue gas, causing air pollution

The arsenic-containing dust obtained through reduction smelting has the characteristics of large flue gas volume, high temperature, high dust content, and fine dust particle size. The conventional dust collection method is to use a bag filter, and the filter bag used for bag dust collection is an ordinary material. , easy to stick to the filter bag, resulting in low dust collection efficiency and low arsenic collection purity

[0005] (2) The purity of the obtained arsenic product is not high

Most of the treatment of arsenic in the current technology is mainly for the treatment of arsenic-containing fume, and in the process of processing this kind of soot, it is often considered that the arsenic in the soot exists in the form of arsenic trioxide, ignoring other arsenic-containing phases, so As a result, the purity of the final arsenic product is not high

[0006] (3) Precious metals such as indium are difficult to recycle

[0007] (4) It is difficult to recycle the residual liquid in the recovery process of indium

However, in this process, the blast furnace is used to reduce and smelt the high-arsenic and multi-metal indium-containing materials, the reduction time is long, the efficiency is low, and the obtained flue gas content is large, the flue gas has high dust content, and the dust particle size is fine.

Increasing the processing capacity of the subsequent process is not conducive to the enrichment of the precious metal (In) and affects the recovery rate of the precious metal (In)

In addition, in the process of recovering indium by wet process, there is no mention of the recovery and treatment process of the treated liquid

[0009] The application number is CN 201410650579.6, "Method for treating arsenic in flue gas from smelting high-arsenic materials". This process can theoretically obtain arsenic with high purity through two-stage cooling + two-stage dust removal, but in actual operation, the air cooler Difficult to control temperature during cooling, so recovery of arsenic may not be complete

In addition, the bag filter may re-pump the solid fume that has been separated from the arsenic during the negative pressure suction, and mix the arsenic fume.

And the larger flue gas content will increase the pressure of electric dust collection in this process, thereby increasing the pressure of bag dust collection in the subsequent process, resulting in low efficiency of subsequent arsenic collection

In addition, in the following two stages of dust collection in this process, bag dust collection is used to filter the arsenic-containing fume, and the arsenic-containing fume obtained by reduction smelting has a finer particle size and higher viscosity, and the bag dust collection is likely to cause sticking during the dust collection process. And it is impossible to filter solid smoke with fine particle size, resulting in low purity of arsenic

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