Alkali-free Process for Enhancing the Flotation of Associated Silver in Yulong Lead-Zinc Ore with Modified Dithiophosphate-type Collector
Aiming at the low recovery of associated silver minerals during the flotation process of Yulong lead-zinc ore,a study on an alkali-free lead-silver flotation process with a novel collector was conducted.The research results indicated that,at a grinding fineness of-74 μm accounting for 65%,using sodium sulfite and zinc sulfate as depressants,and adopting the modified dithiophosphate-type collector CY-1,significantly enhanced the silver recovery in lead-silver concentrate under alkali-free conditions.Closed-circuit experiment of this process obtained the lead-silver concentrate with a lead grade of 52.05%and a silver grade of 4 866 g/t.The recovery rates for lead and silver were 91.76%and 84.43%,respectively.Compared to the high-alkali process using sodium diethyldithiocarbamate and ammonium dibutyl dithiophosphate as collectors,the lead and silver recovery rates increased by 2.5 and 6 percentage points,respectively.This process eliminates the depression of lime on silver minerals during the flotation process,contributing to the comprehensive recovery of rare precious metals associated with lead-zinc ore and enhancing the overall resource utilization efficiency.
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