磁铁矿反浮选脱硅提纯有机硅捕收剂TAS550应用与机理

Application and mechanism of organosilicon collector TAS550 for desilication and purification of magnetite by reverse flotation

以一种有机硅化合物苄基氨乙基氨丙基二甲氧基甲基硅烷(TAS550)作为捕收剂,进行磁铁矿反浮选脱硅提纯研究,并通过红外光谱分析、接触角、吸附量测定、Zeta电位测定等分析测试技术对捕收剂与矿物之间的作用机理进行了探讨研究。浮选研究结果表明TAS550具有优秀的捕收性能,在pH值为8.0的条件下,TAS550用量为2×10^(-4)mol/L时,对石英、磁铁矿的捕收性达到较优,回收率分别为98.21%、79.13%,加入淀粉作抑制剂,用量为400 mg/L时能够有效抑制磁铁矿且对石英回收率影响较小;在该条件下进行石英与磁铁矿反浮选试验达到了理想的指标;红外光谱分析、Zeta电位、吸附量测定以及接触角测定试验表明:捕收剂TAS550与石英产生了物理吸附,并有效地提高了石英表面的疏水性。

This paper studied the desilication and purification of magnetite reverse flotation using an organosilicon compound benzylaminoethylaminopropyldimethoxymethylsilane(TAS550)as a collector,and the action mechanism between the collector and minerals by FTIR analysis,contact angle,determination of adsorbing capacity,determination of Zeta potential.As shown by the result of the flotation study,TAS550 displayed excellent collection performance.Under the conditions of pH 8.0 and 2×10^(-4)mol/L TAS550,the performance in collecting quartz and magnetite reached the optimal level.Their recovery rates were 98.21% and 79.13%,respectively.Using 400 mg/L starch as an inhibitor could effectively inhibit magnetite and had little impact on the recovery of quartz.The tests on the reverse flotation of quartz and magnetite under such a condition reached ideal indicators.The experiments on the determination of FTIR,Zeta potential,adsorbing capacity,and contact angle indicated the collector TAS550 was physical adsorption on the surface of quartz and effectively improved the hydrophobicity of the quartz surface.