关键词: 含砷金矿石, 金砷分离, 矿浆pH, 保护剂LA

Abstract: A certain Henan gold mine with gold and arsenic content of 2.00 g/t and 1.24% belongs to the refractory gold ore with high content of As. In order to utilize the resource，this paper controls the pH of slurry with lime to depress the alkality that are needed by arsenic ores. Meanwhile，the protective agent LA is added to destroy the hydrophilic oxidized film which is formed on the surface of sulfide mineral in the condition of alkalinity. By this method，the separation of gold and arsenic has successfully achieved. In the closed test，the gold grade of gold concentrate can reach 68.00 g/t with the gold recovery of 78.43%，and the arsenic content of only 0.37%. The mechanism analysis shows that as the gold carrier is the arsenic-containing gold mineral of sulfide，and for the difference of the thermodynamics stability of arsenic and sulfide mineral，it is feasible to separate gold and arsenic in theory by adding protective agent LA to destroy the hydrophilic oxidized film of the sulfide mineral surface in alkalinity condition，thus providing a theoretical basis for test results.

Key words: Arsenic-containing gold ore, Separation of gold and arsenic, Slurry pH, Protective agent LA