缓冷时间对铜渣工艺矿物学特性及浮选指标的影响OA

Copper slag from a"double-flash"process in certain enterprise in Hubei Province was treated with slow-cooling durations of 12,15,18 and 21 h to investigate its process mineralogy and flotation performance.Chemical phase analysis,optical microscopy,SEM-EDS and automated mineral analysis were employed to characterize the chemical composition,mineral constituents,dissemination characteristics and liberation behavior.Flotation tests were conducted for validation.The results show that prolonging slow-cooling can promote the transformation of copper minerals from magnetite-encapsulated forms to discrete phases with clear boundaries,while simultaneously coarsening the grain size and enhancing the liberation of both copper sulfide and metallic copper.At a grinding fineness where the mass fraction of particles finer than 0.045 mm accounts for 75%,the mass fractions of particles with liberation degree more than 75%reach 75.58%for copper sulfide and 67.07%for metallic copper.These improvements in occurate state and liberation characteristics significantly enhance flotation performance:as slow-cooling time is extended from 12 h to 21 h,copper recovery increases from 59.9%to 72.0%and concentrate grade from 6.42%to 7.94%.Copper ferrite represents the primary phase limiting copper recovery,with copper losses predominantly occurring in the fine fractions below 25 μm and locked particles.