硫化铜镍矿表面氧化机制及浮选行为研究

发布时间：2018-02-09 07:42

本文关键词： 镍黄铁矿黄铜矿电位调控表面氧化产物　出处：《江西理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：铜镍硫化矿矿石性质普遍较为复杂,硫化矿物间的可浮性相近,目的矿物自身表面氧化现象明显,再加上难免离子的刺激,脉石矿物的泥化影响,导致铜镍矿物的浮选回收与分离困难,为此本文系统的研究了硫化铜镍矿的浮选行为及其表面产物的作用机制,考查了镍黄铁矿和黄铜矿在自诱导和捕收剂诱导条件下的浮选行为及其表面氧化产物,为综合回收硫化铜镍矿提供了基础,对提高铜镍资源的利用率意义重大。主要的研究内容如下:(1)在自诱导浮选条件下,镍黄铁矿在接近中性矿浆条件下可浮性最好,而黄铜矿仅在高碱性条件下的可浮性较差,在p H分别为4.01、6.86、9.18时,黄铜矿与镍黄铁矿的可浮电位区间相近,通过电位调控较难分离。(2)在捕收剂诱导条件下,镍黄铁矿在全p H值范围内均可浮,但仍在中性p H条件下浮选回收率最高,而黄铜矿在全p H值内的可浮性均较好,与自诱导时相比,黄铜矿与镍黄铁矿的可浮性电位区间均变宽。(3)在自诱导和捕收剂体系中,矿浆电位随p H值的升高而降低,硫化矿物只能在一定的电位区间内具有可浮,过高或过低均会影响矿物的可浮性,且在捕收剂体系中硫化矿的可浮区间大于水体系的可浮区间。(4)黄铜矿和镍黄铁矿的循环伏安曲线结果表明,在水体系中,硫化矿的表面疏水产物为单质S,电极表面的矿物被氧化生成单质S的区间与矿物的可浮电位区间基本一致;在丁基黄药体系中,丁基黄药在镍黄铁矿和黄铜矿表面吸附并生成双黄药,使浮选回收率也随之增大,而当矿浆电位升高到一定程度后,镍黄铁矿和黄铜矿表面被过度氧化,生成了S2O32-、SO42-、Cu(OH)2、Fe(OH)2、Ni(OH)2等亲水性的氧化物,阻碍了双黄药在硫化矿表面的吸附,浮选回收率也随之下降。(5)利用红外光谱测试进一步确定了镍黄铁矿和黄铜矿与丁基黄药作用后的产物主要是双黄药,这与热力学和循环伏安测试的结果是相一致的。在一定的矿浆电位区间内,其表面产物的红外光谱强度、吸附量与浮选回收率均有一定的对应关系,且表面产物的种类不随矿浆电位的变化而改变。通过本文的研究,可以更加深入的了解硫化铜镍矿电位调控浮选行为和与丁基黄药的作用机理,为电位调控浮选在复杂硫化铜镍矿中的应用奠定了基础,给矿山实际生产提供了一定的理论指导。
[Abstract]:The ore properties of copper-nickel sulphide ore are generally complex, the floatability of sulphide minerals is similar, the surface oxidation phenomenon of the target minerals is obvious, coupled with the stimulation of inevitable ions, the mudding effect of gangue minerals is obvious. The flotation recovery and separation of copper-nickel minerals are difficult. In this paper, the flotation behavior of copper-nickel sulphide ores and the action mechanism of surface products are systematically studied. The flotation behavior and surface oxidation products of nickel pyrite and chalcopyrite under the conditions of self-induction and collector induction were investigated, which provided the basis for comprehensive recovery of copper-nickel sulphide ore. The main research contents are as follows: under the condition of self-induced flotation, the floatability of nickel pyrite is the best under the condition of near neutral pulp, but the floatability of chalcopyrite is poor only under the condition of high alkalinity. When pH is 4.01 ~ 6.86 and 9.18 respectively, the floating potential range of chalcopyrite and nickel pyrite is similar, and it is difficult to separate. (2) under the condition of collector induction, nickel pyrite can float in the whole pH range. But the flotation recovery is the highest under neutral pH, and the floatability of chalcopyrite is better in the whole pH value. Compared with self-induction, the range of floatability potential of chalcopyrite and nickel pyrite becomes wider. 3) in the system of self-induction and collector, the floatability potential range of chalcopyrite and nickel pyrite becomes wider. The pulp potential decreases with the increase of pH value. Sulfide minerals can only be floatable in a certain potential range. Too high or too low will affect the floatability of minerals. The results of cyclic voltammetry curves of chalcopyrite and nickel pyrite show that the floatability of sulphide ore in collector system is larger than that of water system. The hydrophobic product on the surface of sulphide ore is simple S.The range of oxidized minerals to form elemental S on the electrode surface is basically the same as the floatability potential interval of minerals, and in Ding Ji xanthate system, Ding Ji xanthate adsorbs on the surface of nickel pyrite and chalcopyrite and forms double xanthate, which increases the flotation recovery, but when the pulp potential increases to a certain extent, the surface of nickel pyrite and chalcopyrite is overoxidized. Hydrophilic oxides, such as S _ 2O _ 32-so _ 42-O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) O _ (2) and so _ (2) O _ (2) O _ (2) O _ (2) O _ (2). The recovery rate of flotation also decreased. 5) the products of nickel pyrite and chalcopyrite interacting with Ding Ji xanthate were determined by infrared spectroscopy. It is consistent with the results of thermodynamic and cyclic voltammetry measurements. In a certain range of pulp potential, the infrared spectrum intensity, adsorption capacity and flotation recovery rate of the surface products are all related to each other. The types of surface products do not change with the change of slurry potential. Through the research in this paper, we can further understand the flotation behavior of copper nickel sulphide ore and the mechanism of its action with Ding Ji xanthate. It lays a foundation for the application of potential-regulated flotation in complex copper-nickel sulphide ores and provides certain theoretical guidance for the practical production of mines.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD95;TD923

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