含金酸渣硫脲体系清洁浸金研究.

Gold has important strategic significance and economic value.At present, cyanidation is mainly used to extract gold in the industry.However, cyanidation has a long production cycle and the cyanide used is highly toxic.If it is not well managed, there will be potential environmental pollution risks.Taking the gold-bearing acid residue of a gold smelter as the research object, the leaching of gold in a thiourea system was studied.The results show that the leaching rate of gold from gold-bearing acid residue is only 83.17 % under the condition of conventional intensified stirring thiourea leaching.Under the condition of ultra-fine grinding to enhance thiourea leaching, the gold leaching rate of gold-bearing acid residue reaches 89 %;it is recommended that the best experimental scheme is enhanced stirring leaching+one stage ultra-fine grinding leaching+two stage ultra-fine grinding leaching for three times+enhanced stirring leaching.The leaching rate of gold from gold-bearing acid residue can reach 95.04 %,which can realize the clean and deep extraction of gold from gold-bearing acid residue and provide theoretical and technical support for the industrial application of the non-cyanide gold extraction process. [ABSTRACT FROM AUTHOR]