三种有机抑制剂在辉钼矿与滑石浮选分离中的作用

Effects of three organic depressants on flotation separation of molybdenite and talc

采用浮选试验、红外光谱测试和XPS分析等技术研究刺槐豆胶、海藻酸钠和壳聚糖三种有机抑制剂在辉钼矿和滑石浮选分离中的作用。结果表明:在丁基黄药为捕收剂浮选体系中,海藻酸钠对辉钼矿和滑石均无抑制作用,壳聚糖同时抑制了两种矿物的浮选,刺槐豆胶可以选择性地抑制滑石的浮选,从而实现两种矿物的浮选分离。海藻酸钠未在两种矿物表面发生吸附,壳聚糖强烈吸附在两种矿物表面,刺槐豆胶和丁基黄药在辉钼矿表面发生竞争吸附;刺槐豆胶在辉钼矿表面的预先物理吸附无法完全阻止丁基黄药在辉钼矿表面的化学吸附。

The roles of three organic depressants,locust bean gum(LBG),sodium alginate(SA)and chitosan(CS),were investigated in the flotation separation of molybdenite and talc through flotation experiments,Fourier transform infrared(FTIR)spectroscopy test and X-ray photoelectron spectroscopy(XPS)analysis.The results show that,in the flotation system of potassium butylxanthate(PBX)as a collector,SA has no depressive effect on molybdenite and talc,CS simultaneously depresses the flotation of the two minerals,LBG can selectively depress the flotation of talc,thus realizing the flotation separation of the two minerals.SA is not adsorbed on the surfaces of the two minerals,while CS is strongly adsorbed on the surfaces of the two minerals.LBG and PBX undergo competitive adsorption on the surface of molybdenite,and the prior physical adsorption of LBG on the molybdenite surface cannot completely prevent the chemical adsorption of PBX on the molybdenite surface.