球磨介质及尺寸对铜锌矿矿浆化学性质及矿物表面化学性质的影响

发布时间：2018-05-31 05:21

  本文选题：闪锌矿 + 磨矿　； 参考：《中国有色金属学报》2017年08期

【摘要】：采用飞行时间二次离子质谱仪和改良球磨机研究了磨矿环境对铜锌矿矿浆的化学性质和闪锌矿的表面化学性质的影响。通过采用改良后的球磨机实现磨矿过程中溶液p H、矿浆电位、电导率、溶解氧含量及离子浓度等矿浆化学性质的实时监测。随着磨矿时间的延长,矿浆p H值缓慢升高,矿浆电位和溶解氧含量迅速下降。结果表明:球形磨矿介质的直径越小,矿浆中溶解氧消耗越快,磨矿后矿浆静电位越低,矿浆的离子浓度也越低。飞行时间二次离子质谱仪对磨矿后闪锌矿的表面化学分析表明,磨矿后铁氧化物和氢氧化物会附着于闪锌矿表面,球磨介质的材料与尺寸大小对矿物表面存在的二次离子有较大影响。分别与不锈钢球或者2.54 cm的大球相比,铸铁球或1.27 cm的小球可为矿浆提供更多的铁离子,促进磨矿环境下的电化学反应,从而在闪锌矿表面累积更多的铁氧化物或氢氧化物,降低铜离子的吸附。因此,矿浆化学性质和闪锌矿的表面化学性质受磨矿介质的材料与介质的尺寸控制。
[Abstract]:The effects of grinding environment on the chemical properties of copper and zinc ore slurry and the surface chemical properties of sphalerite were studied by time of flight secondary ion mass spectrometer and improved ball mill. The solution pH, pulp potential, conductivity, dissolved oxygen content and ion concentration were monitored in real time by using the improved ball mill. With the prolongation of grinding time, the pH value of pulp increases slowly, and the pulp potential and dissolved oxygen content decrease rapidly. The results show that the smaller the diameter of spherical grinding medium, the faster the consumption of dissolved oxygen in slurry, the lower the electrostatic potential of slurry after grinding, and the lower the ion concentration of slurry. The surface chemical analysis of sphalerite after grinding by time of flight secondary ion mass spectrometer shows that iron oxide and hydroxide will adhere to the surface of sphalerite after grinding. The material and size of ball-milling medium have great influence on the secondary ions on mineral surface. Compared with stainless steel ball or 2.54 cm ball, cast iron ball or 1.27 cm ball can provide more iron ions for slurry, promote electrochemical reaction in grinding environment and accumulate more iron oxide or hydroxide on sphalerite surface. Reduction of copper ion adsorption. Therefore, the chemical properties of slurry and sphalerite surface are controlled by the size of material and medium of grinding medium.
【作者单位】： 武汉工程大学化学与环境工程学院;西安大略大学表面化学研究所;
【基金】：湖北省教育厅优秀中青年科技创新团队(T201506)~~
【分类号】：TD952
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本文编号：1958447