金属离子对黑钨矿浮选行为的影响及作用机理研究

发布时间：2018-04-23 12:04

本文选题：黑钨矿 + GY浮选法　；参考：《昆明理工大学》2017年硕士论文

【摘要】：我国钨资源的开发和利用以黑钨矿为主,目前,我国钨精矿主要由黑钨矿提供。由于长期超负荷开采,品位高、易于用重选回收的粗粒黑钨矿资源日渐枯竭,浮选法处理细粒级黑钨矿已成为回收该类矿石最主要的方法。黑钨细泥伴生组分复杂,浮选矿浆中大量的金属离子是影响黑钨矿浮选的重要因素。论文旨在通过对金属离子在黑钨矿单矿物浮选中的作用机理研究,为实际矿石的浮选提供指导。论文采用GY浮选钨矿工艺,采用盐酸、氢氧化钠调节矿浆pH值,硝酸铅为活化剂,水玻璃为抑制剂,捕收剂为GYB和TA-3按体积分数为5:1配比的组合捕收剂,进行单矿物浮选试验,在此基础上,研究Cu~(2+),Fe~(3+),Zn~(2+)中任意一种或两种金属离子对黑钨矿浮选行为的影响,并通过吸附量测定、溶液化学计算、动电位测试、红外光谱扫描的方法深入探讨金属离子对黑钨矿浮选的作用机理。当矿浆 pH=6.8 时,Cu~(2+),Fe~(3+),Zn~(2+)在矿浆中的主要以 Cu~(2+)、Cu(OH)_2(s)、Fe(OH)_3(s)以及Zn~(2+)的形式吸附在矿物表面,促使药剂吸附量改变、表面电位正移以及红外光谱的特征峰偏移。矿浆中添加单一金属离子浓度在0～1× 10~(-3)mol/L范围内时,当Cu~(2+)浓度在0～6×10~(-5)mol/L范围内时,Cu~(2+)能够活化黑钨矿的浮选,且随着Cu~(2+)浓度的提高,其对黑钨矿浮选的活化能力先增强后减弱;当添加的Cu~(2+)超过该浓度时,Cu(OH)_2(s)吸附在黑钨矿表面干扰了 Pb~(2+)对黑钨矿的活化作用,Cu~(2+)开始对黑钨矿的浮选有抑制作用;Fe(OH)_3(s)吸附在黑钨矿表面干扰了 Pb~(2+)对黑钨矿的活化作用,Fe~(3+)在整个浓度范围内都对黑钨矿的浮选都有较强的抑制作用;Zn~(2+)对黑钨矿的浮选没有明显的影响。矿浆中添加两种金属离子浓度在0～1 × 10~(-3)mol/L范围内时,同时添加Cu~(2+)+Zn~(2+)和Fe~(3+)+Zn~(2+)与分别单独添加Cu~(2+),Fe~(3+)时相比,黑钨矿的浮选行为基本一致,Zn~(2+)不会干扰Cu~(2+),Fe~(3+)对黑钨矿浮选行为的影响。Cu~(2+)+Fe~(3+)比Cu~(2+)+Zn~(2+)和Fe~(3+)+Zn~(2+)对黑钨矿浮选的抑制作用更强,且Cu~(2+)+Fe~(3+)在浓度低于6× 10~(-5)mol/L时,Fe(OH)_3(s)吸附在矿物表面抑制了 Cu~(2+)对浮选黑钨矿的活化作用,当Cu~(2+)+Fe~(3+)在浓度超过6× 10~(-5)mol/L时,Cu(OH)_2(s)和Fe(OH)_3(s)在黑钨矿表面形成竞争吸附,进一步恶化了黑钨矿的浮选环境。
[Abstract]:The development and utilization of tungsten resources in China is mainly wolframite. At present, tungsten concentrate in China is mainly supplied by wolframite. Due to long-term overload mining, high grade and easy to be recovered by gravity separation, coarse wolframite resources are exhausted day by day. Flotation treatment of fine wolframite has become the most important method to recover this kind of ore. The associated components of wolframite slime are complex, and a large number of metal ions in flotation slurry are important factors affecting the flotation of wolframite. The purpose of this paper is to provide guidance for the flotation of wolframite by studying the action mechanism of metal ions in the flotation of wolframite single minerals. In this paper, GY flotation process was used to adjust pH value of slurry by hydrochloric acid and sodium hydroxide, lead nitrate as activator, sodium silicate as inhibitor, collector as combined collector with GYB and TA-3 at 5:1 by volume fraction, and the flotation test of single mineral was carried out. On this basis, the effects of any one or two metal ions in Cu~(2 on the flotation behavior of wolframite were studied, and the adsorption capacity, solution chemistry calculation and potentiodynamic measurement were used to study the effect of any one or two metal ions on the flotation behavior of wolframite. The mechanism of metal ions acting on wolframite flotation is discussed by infrared scanning. When the pulp is pH=6.8, the mineral surface is mainly adsorbed on the mineral surface in the form of Cu~(2 and Zn~(2). The surface potential is shifted positively and the characteristic peak of infrared spectrum is shifted. The flotation of wolframite can be activated when the concentration of single metal ion is 0 ~ 1 脳 10~(-3)mol/L and the concentration of Cu~(2 is in the range of 0 ~ 6 脳 10~(-5)mol/L. The activation ability of wolframite floatation first increases and then weakens with the increase of Cu~(2 concentration. When the addition of Cu~(2 is above this concentration, the adsorption of Cu~(2 on the surface of wolframite interferes with the activation of wolframite. The activation of wolframite is inhibited by the addition of Cu~(2) and the adsorption on the surface of wolframite interferes with the adsorption of Pb~(2 on the surface of wolframite. In the whole concentration range, there is a strong inhibitory effect on the flotation of wolframite. There is no obvious effect on the flotation of wolframite. When the concentration of two kinds of metal ions is in the range of 0 ~ 1 脳 10~(-3)mol/L, the addition of Cu~(2) Zn~(2) and Fe~(3) Zn~(2) in the slurry is compared with the addition of Cu~(2 ~ (+) ~ (2 +) ~ (3), respectively, when the concentration of two metal ions is in the range of 0 ~ 1 脳 10~(-3)mol/L. The flotation behavior of wolframite is almost the same as that of Cu~(2) Zn~(2) and Fe~(3) Zn~(2). The effect of the flotation behavior of wolframite on the flotation behavior of wolframite is stronger than that of Cu~(2) Zn~(2) and Fe~(3) Zn~(2). The activation of wolframite was inhibited by the adsorption of Cu~(2 on the mineral surface when the concentration of Cu~(2) Fe~(3 was lower than 6 脳 10~(-5)mol/L. When the concentration of Cu~(2) Fe~(3 was higher than 6 脳 10~(-5)mol/L, the activation of wolframite was inhibited. When the concentration of Cu~(2) Fe~(3 was above 6 脳 10~(-5)mol/L, it formed competitive adsorption on the surface of wolframite. The flotation environment of wolframite is further deteriorated.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD923;TD954

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