粗砷烟尘提纯生产三氧化二砷技术的工业化应用实践.

The coarse arsenic fume is an inevitable product of the gold roasting and smelting process in the treatment of complex arsenic-containing gold concentrate. The way it is effectively disposed of safely, environmentally friendly, and recovered as resources, has become a technical problem for the gold and non-ferrous metal smelting industry. In the production process of a gold smelting company, the mass fractions of arsenic trioxide, gold, and silver in the coarse arsenic fume are 86. 50 %,1. 1 g/t, and 11 g/t, respectively. The coarse arsenic fume is treated using closed fluidization transportation of coarse arsenic fume, multi-stage gradient temperature-controlled distillation, multi-stage slow-cooling crystallization of arsenic, leaching of gold and silver from arsenic-removal slag and recycling of arsenic-removal tail gas. This technology has been successfully applied on an industrial scale. The primary product obtained has an arsenic trioxide mass fraction of 99. 51 %,and the arsenic recovery rate reaches 99. 10 %. The gold and silver recovery rates are 81. 17 % and 79. 94 % respectively. The industrial application of the purification and production of arsenic trioxide from coarse arsenic fume successfully transforms coarse arsenic fume hazardous waste into a secondary high-value resource, overcoming the technical bottlenecks of producing high-purity arsenic trioxide from coarse arsenic fume both domestically and internationally. The comprehensive recovery, recycling, and clean production of coarse arsenic fume resources have significant environmental, economic, and social benefits, demonstrating wide-ranging value for promotion and application. [ABSTRACT FROM AUTHOR]