Flotation performance of anisic hydroxamic acid as new collector for tungsten and tin minerals

In order to improve the recovery of tungsten ores containing tin minerals,anisic hydroxamic acid(p-methoxy benzohydroxanic acid,PMOB)was synthesized and introduced as novel collector in the flotation of scheelite,wolframite and cassiterite.The flotation performance and adsorption mechanism were investigated by micro/batch flotation,zeta potential measurements and density functional theory(DFT).The micro flotation results showed that the recoveries of scheelite,wolframite and cassiterite using PMOB as collector are 97.45%,95.77% and 90.08%,respectively,and the corresponding recoveries are 91.00%,84.30% and 84.67% for benzohydroxamic acid(BHA).The batch flotation results revealed that the collector dosage could be reduced by about 45% for PMOB compared with BHA,in the case of similar flotation indicators.Zeta potential measurements indicated that PMOB could be adsorbed on the mineral surfaces by chemisorption.Moreover,density functional theory(DFT)calculation results showed that the substituent group—OCH_(3)endues PMOB stronger electron donation ability and hydrophobicity compared with benzohydroxamic acid(BHA),pmethyl benzohydroxamic acid(PMB)and p-hydroxyl benzohydroxamic acid(PHB).

湖南某多金属矿钨锡同步浮选回收试验研究

针对湖南某大型钨多金属矿有用矿物嵌布粒度细、矿物组成复杂、伴生锡资源品位低、矿物可浮性差、单独回收锡成本高等难题,在磨矿细度-0.074 mm粒级占82.35%条件下,采用自主研发的新型捕收剂GYX对WO_(3)品位0.34%、Sn品位0.089%的硫化矿浮选尾矿进行了1次粗选、3次扫选、5次精选的钨锡混合浮选,获得了WO_(3)品位38.11%、Sn品位3.87%的钨锡混合精矿,钨、锡回收率分别为74.05%、29.74%,实现了对钨锡矿物的同步回收。