Method for removing arsenic matte by alkaline leaching at oxygen pressure and recovering arsenic

Abstract

The invention relates to a method for removing arsenic matte by alkaline leaching at oxygen pressure and recovering arsenic, and belongs to the technical field of hydrometallurgy. The method comprises the following steps of: crushing arsenic matte and adding the crushed arsenic matte according to the solid-to-liquid ratio of 1:(3-20mg / ml) to form pulp; adding the pulp to a pressurizing kettle; introducing a gas oxidizing medium and performing an alkaline leaching reaction at oxygen pressure for 1-5 hours by controlling the pressure at 0.2-1.8MPa, the leaching temperature at 100-200 DEG C, and the stirring speed at 300-600r / min; flashing and filtering the pulp after alkaline leaching at oxygen pressure to obtain leached residue for recovering copper; and cooling and crystallizing leaching liquid subjected to alkaline leaching at oxygen pressure and recovering arsenic. According to the method provided by the invention, the reaction process is strong in selectivity, good in arsenic removal effect, high in degree of automation, high in production efficiency, small in environmental pollution and low in energy consumption.

Description

technical field [0001] The invention relates to a method for removing and recovering arsenic by oxygen pressure alkali leaching arsenic matte and belongs to the technical field of hydrometallurgy. Background technique [0002] With the rapid development of the non-ferrous metal industry, the contradiction between supply and demand of mineral resources has become increasingly prominent, and complex and refractory resources have been widely used in production. In the lead smelting system that uses high-arsenic and high-impurity lead concentrates as raw materials, a large amount of arsenic matte (also known as yellow slag) will be produced. In addition to valuable metals such as copper, lead, and silver, it also contains arsenic, etc. The presence of impurities and arsenic makes the treatment of arsenic matte face severe technical and environmental pressures. Therefore, the key to the treatment of arsenic matte lies in the effective removal and recovery of arsenic. [0003] Th...

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Problems solved by technology

[0003] The invention patent application (CN 201110354232) discloses a process for the comprehensive recovery of arsenic by two-stage roasting of arsenic-containing carbon-gold concentrate. The arsenic-containing carbon-gold concentrate is subjected to two-stage roasting treatment, and the dust-containing flue gas generated is first collected by a cloth bag. The device recovers arsenic trioxide, and then performs wet purification in the acid system to produce arsenic-containing dilute acid; soak the calcined sand produced after roasting with dilute sulfuric acid to produce arsenic-containing acid immersion solution. The process of the above method is relatively complicated and fire treatment process, will pollute the environment

The above two inventions only mentioned the method of recovering arsenic by alkaline leaching. Compared with the oxygen pressure alkaline leaching method, the recovery of arsenic by alkaline leaching has a longer reaction time and the arsenic leaching rate is not ideal.

Arsenic matte is usually treated by fire process in industrial production, such as reverberatory furnace oxidation smelting, converter blowing, blast furnace and electric furnace smelting, alkali roasting and water immersion, etc. These methods have poor arsenic removal effect and arsenic will pollute the environment twice , and all have the disadvantages of high energy consumption, low comprehensive recovery rate of metals, long process flow, etc., which no longer meet the requirements of industry and social and economic development.

There are few reports on other wet processes, such as sulfuric acid leaching to remove arsenic, but the effect of this technology is not ideal, and it will produce AsH 3 Gas pollutes the environment and even causes casualties

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