稀土矿浮选中Ce~(3+)对含钙脉石活化作用机理研究
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摘要
通过单矿物浮选试验、红外光谱分析和Zeta电位测试等方法,研究了以辛基异羟肟酸为捕收剂浮选稀土时矿浆中Ce~(3+)对含钙脉石矿物萤石及方解石的活化作用机理。浮选结果表明,当辛基异羟肟酸浓度为2.0×10~(-4) mol/L、矿浆中Ce~(3+)浓度小于1×10~(-4) mol/L时,pH值在6～10之间时,Ce~(3+)对含钙矿物萤石及方解石有活化作用。机理分析结果表明,Ce~(3+)吸附在含钙矿物萤石及方解石表面形成了活性位点,可与羟肟酸根离子产生络合吸附,生成稳定的五元环络合物,增大了羟肟酸在矿物表面的吸附能力,从而活化矿物。
In the flotation pulp of rare earth with octanohydroxamic acid(OHA) as the collector, the activation mechanism of Ce~(3+) ions on calciferous gangues such as fluorite and calcite was studied by single mineral flotation test, IR spectroscopy and zeta potential measurement. The flotation results showed that with an OHA concentration of 2.0×10~(-4) mol/L, Ce~(3+) concentration less than 1×10~(-4) mol/L, and pH at range of 6～10, both fluorite and calcite could be activated by Ce~(3+). According to the mechanism study, with more active sites generated on the Ce~(3+)-adsorbed surface of fluorite and calcite, the reaction of both gauges with hydroxamic acid was enhanced, and a stable five-membered ring complex was created, which increased the adsorption capacity of hydroxamic acid thereon and activated these minerals.
In the flotation pulp of rare earth with octanohydroxamic acid(OHA) as the collector, the activation mechanism of Ce~(3+) ions on calciferous gangues such as fluorite and calcite was studied by single mineral flotation test, IR spectroscopy and zeta potential measurement. The flotation results showed that with an OHA concentration of 2.0×10~(-4) mol/L, Ce~(3+) concentration less than 1×10~(-4) mol/L, and pH at range of 6～10, both fluorite and calcite could be activated by Ce~(3+). According to the mechanism study, with more active sites generated on the Ce~(3+)-adsorbed surface of fluorite and calcite, the reaction of both gauges with hydroxamic acid was enhanced, and a stable five-membered ring complex was created, which increased the adsorption capacity of hydroxamic acid thereon and activated these minerals.
引文
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[2]Filippove I,Filippove L,Duverger A,et al.Synergetic effect of a mixture of anionicand nonionic reagent:Ca mineral contrast separation by flotation at neutral p H[J].Minerals Engineering,2014,66(11):135-144.
[3]Fuerstenau D,Pradip,Herrera-Urbina R.The surface chemistry of bastnaesite,barite and calcite in aqueous carbonate solutions[J].Colloids and Surfaces,1992,68:95-102.
[4]Gao Z,Li C,Sun W,et al.Anisotropic surface properties of calcite:A consider of surfacebroken bonds[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2017,520(5):53-61.
[5]张波,李解,张雪峰.Cu2+,Fe3+对萤石浮选的活化作用机制[J].稀有金属,2016,40(9):963-968.
[6]董宏军,陈荩.金属离子对蓝晶石可浮性的影响及机理研究[J].非金属矿,1996(1):27-29.
[7]卢佳,高惠民,金俊勋.钙离子对红柱石浮选的影响及作用机理[J].中国有色金属学报,2016,26(6):1311-1315.
[8]高玉德,邱显扬,韩兆元.羟肟酸浮选白钨矿的机理[J].中国有色金属学报,2015,25(5):1339-1344.
[9]Han H,Hu Y,Sun W,et al.Fatty acid flotation versus BHA flotation of tungsten minerals and their performance in flotation practice[J].International Journal of Mineral Processing,2017,159(2):22-29.
[10]Shackleton N J,Malysiak V,Oconnor C T.The use of amine complexes in managing in advertent activation of pyroxene in a pentlanditepyroxene flotation system[J].Minerals Engineering,2003,16(9):849-856.
[11]Fuerstenau D,Raghavan S.Flotation[M].New York:AIME,1976.
[12]Zhang W,Honaker R Q,Groppo J G.Flotation of monazite in the presence of calcite part I:Calcium ion effects on the adsorption of hydroxamic acid[J].Minerals Engineering,2017,100(1):40-48.