油酸钠作用下异极矿的浮选行为及作用机理

发布时间：2018-06-27 16:11

本文选题：异极矿 + 油酸钠　；参考：《中国有色金属学报》2016年04期

【摘要】：通过纯矿物试验研究油酸钠为捕收剂体系中异极矿的浮选行为。结果表明:当油酸钠用量为3×10~(-4)mol/L、p H值为4~8和11时,异极矿浮选回收率均在80%左右。Zeta电位及红外光谱测试结果表明:油酸钠在异极矿表面主要发生化学吸附,同时也可能存在物理吸附。根据油酸钠溶液和锌离子水解组分含量化学计算,当p H值为4~8时,油酸钠溶液的优势组分为RCOO~-和(RCOO)_2~(2-);而异极矿表面锌离子主要以Zn~(2+)和少量Zn OH~+形式存在。结合异极矿在油酸钠捕收剂体系中的浮选行为,油酸钠在异极矿表面的相互作用原理是异极矿表面Zn~(2+)和羟基络合物Zn(OH)~+成为浮选的活性质点,能与油酸钠作用形成油酸盐,从而使异极矿疏水上浮;RCOOH_(aq)分子和离子-分子缔合物RCOOH·RCOO~-的物理吸附也可能存在;而在p H为11时矿物可浮性较好,可能是油酸根离子与矿物表面的形成Zn(OH)_2发生离子交换。
[Abstract]:The flotation behavior of heteropolar ore in the system of sodium oleate as collector was studied by pure mineral experiment. The results show that when the amount of sodium oleate is 3 脳 10 ~ (-4) mol / L ~ (-1) H = 4 ~ (8) and 11:00, the flotation recovery of heteropolar ore is about 80%. Zeta potential and IR spectra show that the chemisorption of sodium oleate on the surface of heteropolar ore is mainly occurred. There may also be physical adsorption. According to the chemical calculation of the content of sodium oleate solution and zinc ion hydrolytic component, when pH value is 4 ~ 8, the dominant component of sodium oleate solution is RCOO- and (RCOO) -2-, while zinc ions mainly exist in the form of Zn2 and a small amount of ZnOH- on the surface of heteropolar ore. According to the flotation behavior of heteropolar ore in the system of sodium oleate collector, the interaction principle of sodium oleate on the surface of heteropolar ore is that Zn ~ (2) and Zn (OH) ~ on the surface of heteropolar ore become active particles of flotation and can react with sodium oleate to form oleate. Therefore, the physical adsorption of RCOOH- (aq) molecule and ion-molecular association complex RCOOH RCOOO- may also exist, while the mineral floatability is better at 11:00, which may be due to the formation of oleate ion and Zn (OH) 2 on the mineral surface.
【作者单位】：中南大学资源与生物工程学院;
【基金】：国家重点基础研究发展计划资助项目(2014CB643402)~~
【分类号】：TD923.13

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