Arsenic removal process containing post-combustion technology

Abstract

The invention relates to an arsenic removal process containing a post-combustion technology and belongs to the technical field of a gold and silver extraction method for precious metal smelting. The arsenic removal process comprises the following steps of: treating gold concentrate containing arsenic by adopting a two-stage roasting process, removing the arsenic as well as sulphur and changing an ore structure, generating porous roasted ore to facilitate next cyaniding operation and improve the leaching rate of gold, and recovering valuable elements in the concentrate; through controlling the air quantity, removing the arsenic and the sulphur in the first-stage roasting under the anoxic roasting atmosphere, carrying out sulfatizing roasting in the second-stage roasting under the oxygen atmosphere; and after flue gas generated by roasting is subjected to arsenic removal, producing sulfuric acid and generating the arsenic into thick white arsenic for sales. The arsenic removal process has the beneficial effects that a traditional process is improved, a post-combustion process is increased on the basis of the traditional process, the problems of initial sulfur condensation and non-arsenic trioxide (As2S3) compound deposition caused by incomplete combustion of roasted flue gas are solved, and the effects of smooth production process and advanced process index are achieved.

Description

technical field [0001] The invention belongs to the technical field of gold and silver extraction methods for precious metal smelting, and relates to a method for removing arsenic from high-arsenic complex gold concentrates, in particular to a method for removing arsenic with post-combustion technology. Background technique [0002] Since the 1980s, with the rapid development of my country's gold industry, easily-disposable gold ore resources have gradually decreased, and refractory gold ore resources are in urgent need of development, especially for the development of arsenic, carbon, antimony and fine-grained disseminated gold ores Utilization is imminent. Our country is relatively rich in refractory gold ore resources. The gold concentrate treated by this invention is a high-arsenic and high-sulfur gold ore flotation concentrate. It is a refractory gold concentrate. When the pretreatment process is removed or the removal is not complete, the gold leaching rate is extremel...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of arsenic-removing process method containing post-combustion technology, which solves the problem of insufficient combustion of one-stage roasting flue gas in the current domestic two-stage roasting process, which causes initial sulfur condensation and non-oxidized arsenic compounds such as As 2 S 3 The problem of deposition, which makes the process clogged and production is often interrupted

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