A method for recovering arsenic from copper smelting dust

Abstract

The invention provides a system and method for recycling arsenic from copper smelting smoke dust. The system comprises a waste heat boiler cooling system (1), an electric dust collector dust collection system (2), a SO3 removing system, a quick smoke dust cooling system and an arsenic recycling system (5) which are all sequentially connected in order. The SO3 removing system comprises a reactor, a set of lime powder or sodium bicarbonate powder spraying inlets are formed in the upper portion of the reactor, the lower end of a dust hopper of the bottom of the reactor is provided with a dust discharging port and a dust discharging port valve, and a reactor smoke dust outlet is formed in the side wall of the reactor. The quick smoke dust cooling system comprises a shock cooling tower, a set of water spraying holes are formed in the upper portion of the shock cooling tower, the bottom of the shock cooling tower is provided with a smoke dust discharging port and a smoke dust discharging port valve, an overflow port is formed above the smoke dust discharging port valve, and a shock cooling tower smoke dust outlet is formed in the lower portion of the side wall of the shock cooling tower. By the adoption of the system and the method, the content of arsenic in smoke dust can be reduced and following acid manufacturing production and wastewater drainage reduction are facilitated.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a device and a method for recovering arsenic from copper smelting dust. [0002] technical background [0003] In modern copper pyrometallurgical smelting, the arsenic content of copper concentrate is relatively high, and the arsenic in copper concentrate will sublimate to form arsenic gas at high temperature. With the discharge of smelting smoke and dust, part of the arsenic-containing smoke will be released after the waste heat boiler cools down. It is recovered in the electrostatic precipitator, and the temperature at the outlet of the waste heat boiler is still high. After the dust is collected by the electric dust collector, the dust still contains a large part of arsenic gas, and these dust containing arsenic will affect the work of the subsequent acid production process. And it will cause an increase in the amount of hazardous waste, which will easily cause e...

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Problems solved by technology

At present, the existing flue dust quenching arsenic collection technology, the flue dust is unevenly distributed in the quench tower, it is difficult to control the amount of water sprayed according to the required temperature, and the copper smelting flue dust contains a large amount of SO 3 , at lower temperatures, the SO in the soot 3 When the dew point is below, a large amount of acid water will be formed, which will easily make the subsequent wet electrostatic precipitator for collecting arsenic damp

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