Comprehensive recovery device and method for valuable metal in copper smelting acidic wastewater

Abstract

The invention provides a comprehensive recovery device and method for valuable metal in copper smelting acidic wastewater. The device comprises an acidic wastewater pump, a first filter press, a reaction tank, a reaction liquid pump and a second filter press which are sequentially connected, wherein the top of the reaction tank is connected with the first filter press and the bottom of the reaction tank is connected with the reaction liquid pump; the reaction tank is internally provided with a steam heating coil and a stirring, and the top of the reaction tank is further connected with a reagent tank through a metering pump. The method mainly comprises the following steps: (1) carrying out press-filtering in the first press filter to remove solid particles in acidic wastewater; (2) adding a sodium thiosulfate solution in the reagent tank by the metering pump into the reaction tank and controlling the heating temperature of the reaction tank at 60-70 DEG C; and (3) feeding the solution after reaction into the second press filter to be press-filtered and discharging the filtrate after neutralizing treatment. According to the device and method, the recovery rate of metal precipitates such as copper, rhenium, silver and bismuth in the acidic wastewater reaches up to over 90%, so that the loss of valuable metals in the acidic wastewater is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and relates to a comprehensive recovery device for valuable metals in copper smelting sewage acid and a method for comprehensively recovering valuable metals in copper smelting sewage acid by using the device. Background technique [0002] The content of valuable metals in the earth's crust is very low, and they are mainly associated with other ores. At present, during the copper pyrometallurgical smelting process, the selenium, rhenium, bismuth, silver, lead, arsenic, etc. associated with the copper sulfide ore enter the acid system after the flue gas passes through the electrostatic precipitator. Dilute acid sprays and washes the flue gas, so that selenium, rhenium, bismuth, silver, lead, arsenic, etc. in the flue gas are dissolved in the washing liquid, which is commonly known as copper smelting acid. Most copper smelting enterprises only discharge the polluted acid after arseni...

AI Technical Summary

Problems solved by technology

Most copper smelting enterprises only discharge the polluted acid after arsenic removal and neutralization treatment, and do not comprehensively recover valuable metals such as selenium, rhenium, bismuth, silver, etc. in the polluted acid, resulting in a large loss of valuable metals. and pollute the environment

[0003] In addition, the copper concentrate purchased by general copper smelting enterprises has a wide range of sources and complex components. The copper smelting sewage acid contains a wide variety of valuable metals, such as copper, lead, arsenic, zinc, antimony, selenium, bismuth, silver, etc. Among them, copper and arsenic are the main components, and the content of other valuable metals fluctuates widely with the change of copper concentrate, which to a certain extent makes the comprehensive recovery of valuable metals difficult.

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