Depressant Action of Ca and Mg on Flotation of Cu-activated Sphalerite

机译：Ca和Mg的抑制作用作用于Cu - 活性闪锌矿浮选

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The effect of Ca (500 ppm) and Mg (50 ppm) ions on uptake of copper and xanthate on sphalerite and flotation of Cu-activated sphalerite was investigated as a function of pH. Copper and xanthate uptake showed no change due to the presence of Ca and Mg. Flotation recovery was significantly reduced when pH exceeded that for formation of the corresponding hydroxide precipitate. The recovery decrease was much stronger for Mg, reflecting the lower pH for onset of hydroxide precipitation (ca. pH 9) than for Ca (ca. pH 12). Scanning Electron Microscopy and X-ray Photoelectron Spectroscopy determined that the Mg(OH)_(2(s)) precipitates were present as patches on the surface. The depressant mechanism appears to be formation of hydrophilic hydroxide sites on the sphalerite surface, which compete with the hydrophobic (Cu/xanthate) sites.

机译：Ca（500ppm）和mg（50ppm）离子对铜和黄嘌呤的吸收的影响，作为pH的函数研究了Cu-活性闪锌矿的浮选和浮选。由于Ca和Mg的存在，铜和黄原酸背乳酸摄取没有变化。当pH超过形成相应的氢氧化物沉淀时，浮选回收率显着降低。 Mg的回收减少更强烈，反映氢氧化物沉淀的较低的pH值（Ca.Ph 9）比对于Ca（pH 12）。扫描电子显微镜和X射线光电子能谱确定Mg（OH）_（2（S））沉淀物作为表面上的斑块存在。抑制机制似乎是在闪锌矿表面上形成亲水性氢氧化物位点，其与疏水性（Cu /黄原酸盐）位点竞争。

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《UBC-McGILL international symposium on fundamentals of mineral processing》|2001年||共16页
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D. Lascelles; J. A. Finch; C. Sui;
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中图分类矿物学;
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Depressant Action of Ca and Mg on Flotation of Cu-activated Sphalerite

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