Device and method for extracting high-purity arsenic trioxide through nonferrous smelting quenching

Abstract

The invention discloses a device and a method for extracting high-purity arsenic trioxide by nonferrous smelting quenching, high-temperature high-arsenic-content flue gas generated by a smelting furnace is cooled by a smelting waste heat boiler and then enters a first-stage decontaminating tower, the flue gas is cooled and decontaminated by atomizing and spraying a mixed solution, and meanwhile, harmful gas in the flue gas is absorbed; the cooled flue gas enters a high-efficiency electric dust remover, the flue gas subjected to dust collection by the electric dust remover enters a secondary quench tower, the flue gas is atomized and cooled, arsenic trioxide in the flue gas is separated out, the arsenic-containing flue gas enters a bag-type dust remover to be collected, and the clean sulfur dioxide flue gas subjected to arsenic removal is sent to a sulfuric acid system to be recycled. The arsenic removal selectivity and stability are good, the arsenic removal efficiency reaches 95.0% or above, and the purity of arsenic trioxide obtained through purification reaches 98.0% or above.

Description

technical field [0001] The invention relates to the field of high-temperature and high-arsenic-containing flue gas treatment, in particular to a device and method for rapidly cooling and extracting high-purity arsenic trioxide in nonferrous smelting. Background technique [0002] Arsenic is a ubiquitous element in the earth's crust, but it is a harmful element for almost all mineral resources. Gold ore with arsenic content above 0.1% is usually called arsenic-containing gold ore, which is a typical type of refractory gold ore and an important part of my country's gold ore resources. The harmfulness of arsenic is mainly manifested in the wrapping of arsenic sulfide on gold, which will hinder the reaction between gold and cyanide, resulting in reduced leaching efficiency and poor economic benefits. With the rapid development of the gold industry and copper industry, the competition in the raw material market has intensified, and there are more and more complex and difficult r...

AI Technical Summary

Problems solved by technology

The existence of fluoride and chloride gases in the flue gas not only causes corrosion to the system equipment and the flue, but also consumes a large amount of lye in the process of washing and purifying the flue gas, which greatly increases the amount of smelting dirty acid and waste water Fluorine and chlorine removal treatment costs are high

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