Method for controlling arsenic sulfide residue leaching reaction endpoint

Abstract

The invention discloses a method for controlling the arsenic sulfide residue leaching reaction endpoint and belongs to the field of nonferrous metallurgy. According to the method for controlling the arsenic sulfide residue leaching reaction endpoint, an ORP electrode and a ph electrode are inserted into the side portion of a high-pressure reacting kettle, decoppering post fluid and arsenic sulfideresidue are added into the high-pressure reacting kettle, when the measured voltage at the ORP electrode is in 0.8-1.5 V and the measured pH value at the pH electrode is -0.5-2, reaction reaches theendpoint, the sampling staff workload is reduced, and reaction post fluid is stable in composition.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, and in particular relates to a method for controlling the end point of arsenic sulfide slag leaching reaction. Background technique [0002] With the rapid development of the domestic copper smelting industry, the hazards of arsenic in by-products are becoming more and more serious. The major copper smelting enterprises deal with arsenic by sulfidation replacement and leaching of arsenic sulfide slag to obtain arsenic trioxide, while the intermediate process control is mostly through the reaction process. Intermediate sampling and empirical control are used to control the end point of the reaction, which results in cumbersome work in the process of cooling down-pressure release-sampling-heating-pressurization and the consumption of energy and oxidants; a copper smelter through the reaction Time control is used to control the end point of the reaction, but the reaction time required for differ...

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Problems solved by technology

[0002] With the rapid development of the domestic copper smelting industry, the hazards of arsenic in by-products are becoming more and more serious. The major copper smelting enterprises deal with arsenic by sulfidation replacement and leaching of arsenic sulfide slag to obtain arsenic trioxide, while the intermediate process control is mostly through the reaction process. Intermediate sampling and empirical control are used to control the end point of the reaction, which results in cumbersome work in the process of cooling down-pressure release-sampling-heating-pressurization and the consumption of energy and oxidants; a copper smelter through the reaction Time control is used to control the end of the reaction, but the reaction time required for different components of the material is inconsistent, resulting in energy consumption and incomplete reaction

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