Method for extracting arsenic trioxide from roasting dust of arsenic-containing gold concentrate powder

Abstract

The invention discloses a method for extracting arsenic trioxide from gold concentrate powder roasted fume containing arsenic. The method adopts a staged gradually-heating purification process and a quenching extraction process. The purification process is to volatilize impurities with low melting points in materials under the condition of different temperatures. The purified materials are insulated at a temperature of between 500 and 550 DEG C for more than 150 minutes, so that the arsenic is oxidized into arsenic trioxide gas; the gas is purified through a cyclone dust collector and an electrostatic precipitator in sequence; the purified high-temperature arsenic trioxide gas directly enters a quenching tower of which the temperature is between 120 and 140 DEG C to be crystallized into arsenic trioxide microparticles; and powdery arsenic trioxide collected by a bag arsenic collector is outputted via a scraper conveyor. The method has the advantages that the process procedure is arranged reasonably, controllably and stably, and the rate of extracting the arsenic trioxide from fume is high, and the purity of the extracted arsenic product is high, and the method well solves the problem of arsenic pollution in the gold smelting industry.

Description

technical field [0001] The invention relates to a method for extracting chemical raw materials from smoke generated by precious metal smelting, in particular, the invention relates to a method for extracting arsenic trioxide from smoke dust roasted with arsenic-containing gold concentrate powder. Background technique [0002] Arsenic in nature is often associated with gold concentrate. When gold is refined with arsenic-containing gold concentrate powder, the smoke generated by smelting contains arsenic trioxide. Arsenic trioxide, commonly known as "arsenic", is a highly toxic and important chemical raw material. Random discharge will seriously pollute the environment and waste precious natural resources. How to solve the problem of arsenic trioxide emission in the gold production process has always been a technical problem plaguing the gold smelting industry. At present, in the gold smelting industry, the technology of extracting arsenic trioxide from dust has been used for...

AI Technical Summary

Problems solved by technology

Arsenic trioxide, commonly known as "arsenic", is a highly toxic and important chemical raw material. Random discharge will seriously pollute the environment and waste precious natural resources.

[0004] (2) The loss rate of gold components is high

When the high-temperature arsenic trioxide gas is condensed to 300-360°C, the arsenic trioxide in the form of glass glue sticks to the wall of the bag arsenic collector, which quickly makes the bag arsenic collector lose its collection ability

Images