低碱混合浮选提高某铅锌矿中金浮选指标的工艺研究

Low-Alkali Bulk Flotation Technique to Improve Gold Flotation Index of Lead-Zinc Ore

为了提高湖南某硫化铅锌矿中金浮选指标,采用低碱混浮工艺,粗选取消石灰、硫酸锌等对金有抑制作用的药剂,采用铅硫混浮-铅硫分离-硫精矿脱锌-锌浮选工艺,以丁铵黑药和乙黄药为组合捕收剂,使金矿物尽可能地富集到方铅矿中。闭路试验获得铅精矿中金品位17.60 g/t、回收率45.22%;硫精矿中金品位10.00 g/t、回收率45.51%;总金回收率达到90.73%,较原有工艺大幅提高。

To upgrade the gold flotation index of a lead⁃zinc sulfide ore in Hunan,a low⁃alkali bulk floatation technique was adopted in the research.In a roughing process,lime and zinc sulfate,reagents that may depress the gold flotation,was abandoned.A flotation flowsheet,consisting sequentially of Pb⁃S bulk flotation,Pb/S separation,Zn separation from sulfur concentrate and Zn flotation,was adopted,where ammonium dibutyl dithiophosphate and ethyl xanthate were used as a combined collector to ensure the enrichment of gold minerals in galena.The results of the closed⁃circuit test showed that the gold grade and recovery in the lead concentrate reached 17.60 g/t and 45.22%,while the gold grade and recovery in the sulfur concentrate reached 10.00 g/t and 45.51%,respectively.Namely,the total gold recovery reached 90.73%,remarkably higher than that of the on⁃site approach.