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Impact of gypsum supersaturated solution on the flotation of sphalerite.

机译：石膏过饱和溶液对闪锌矿浮选的影响。

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摘要

Gypsum supersaturation in process water is known to have detrimental effects on flotation performance of sulphide minerals. The motivation of this research is to develop a better understanding of the impact of gypsum supersaturation in process water on sphalerite flotation. For this purpose, this thesis focused on the impacts of gypsum supersaturation in process water on the surface properties of silica and sphalerite minerals, the interactions between flotation reagents and sphalerite, and the interactions between silica and sphalerite minerals in various types of process water.;Removing calcium ions by sodium carbonate addition can significantly offset the detrimental effect of gypsum supersaturated process water on the flotation performance of sphalerite. Micro-flotation of silica and sphalerite mixture minerals shows that the flotation recovery and selectivity of sphalerite are clearly improved after treating the gypsum supersaturated solutions with sodium carbonate.;Results from this study indicate that the adverse impact of gypsum supersaturation in process water on sphalerite flotation is mainly due to high calcium concentration in the gypsum supersaturated process water. This study shows that gypsum precipitates do not form or coat on silica and sphalerite mineral surfaces in the gypsum supersaturated solutions under the conditions studied. However, both silica and sphalerite mineral surfaces are coated by calcium after being conditioned in a gypsum supersaturated solution, resulting in identical surface charge between silica and sphalerite. The high calcium concentration in the gypsum supersaturated process water is found to retard the activation of sphalerite by copper and hence the subsequent xanthate adsorption. The adsorption of calcium ions is identified to compete with copper species for the reactive surface sites of sphalerite, resulting in the reduction in copper and xanthate uptake and hence flotation recovery of sphalerite. Hetero-aggregation between gangue minerals (quartz or silica for example) and sphalerite minerals is induced in the gypsum supersaturated process water. Direct colloidal force measurement using an atomic force microscopy (AFM) shows attractive force profile between silica and sphalerite minerals in both gypsum supersaturated solution and calcium chloride solution containing a similar calcium concentration to that of the gypsum supersaturated solution. The extent of slime coating of silica nanoparticles on sphalerite surfaces is found to increase with the increase in calcium concentration. The retardation of sphalerite activation and subsequent xanthate adsorption, in combination with slime coating of gangue mineral particles results in poor recovery and selectivity in sphalerite flotation process.
机译：众所周知，工艺用水中的石膏过饱和会对硫化物矿物的浮选性能产生不利影响。这项研究的目的是为了更好地了解工艺用水中的石膏过饱和度对闪锌矿浮选的影响。为此，本论文着眼于工艺用水中的石膏过饱和度对二氧化硅和闪锌矿矿物的表面性能的影响，浮选剂与闪锌矿之间的相互作用以及各种工艺用水中硅石与闪锌矿矿物之间的相互作用。通过添加碳酸钠除去钙离子可以显着抵消石膏过饱和工艺用水对闪锌矿浮选性能的不利影响。硅石和闪锌矿混合矿物的微浮选表明，用碳酸钠处理石膏过饱和溶液后，闪锌矿的浮选回收率和选择性得到了明显改善。主要是由于石膏过饱和工艺用水中的钙含量较高。这项研究表明，在所研究的条件下，石膏沉淀不会在石膏和过饱和溶液中的二氧化硅和闪锌矿矿物表面上形成或形成。但是，二氧化硅和闪锌矿矿物表面在石膏过饱和溶液中调理后都被钙覆盖，导致二氧化硅和闪锌矿之间的表面电荷相同。发现石膏过饱和工艺水中的高钙浓度阻碍了铜对闪锌矿的活化，从而阻碍了随后的黄药吸附。钙离子的吸附被确定为与铜种类竞争闪锌矿的反应性表面位点，从而导致铜和黄药的吸收减少，因此闪锌矿的浮选恢复。石膏过饱和过程水中会导致脉石矿物（例如石英或二氧化硅）和闪锌矿矿物之间的异质聚集。使用原子力显微镜（AFM）进行的直接胶体力测量显示，在石膏过饱和溶液和氯化钙溶液中，二氧化硅和闪锌矿矿物之间的吸引力分布曲线与钙过饱和溶液的钙浓度相似。发现在闪锌矿表面上二氧化硅纳米颗粒的粘液涂层的程度随钙浓度的增加而增加。闪锌矿活化的延迟和随后的黄药吸附，与脉石矿物颗粒的粘泥涂层相结合，导致在闪锌矿浮选过程中回收率和选择性差。

著录项

  • 作者

    Deng, Meijiao.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Chemical.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 237 p.
  • 总页数 237
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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