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首页> 外文会议>Copper and Nickel / Extractive Metallurgy; Light Metals / Extractive Metallurgy >The Behaviour of Cobalt and Nickel During Jarosite Precipitation
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The Behaviour of Cobalt and Nickel During Jarosite Precipitation

机译：黄铁矿沉淀过程中钴和镍的行为

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Minor amounts of cobalt and nickel are structurally incorporated in jarosite precipitates and the extent of incorporation increases as the concentration of dissolved cobalt or nickel increases. Potassium jarosite incorporates more cobalt or nickel (?1% Co or Ni) than does sodium jarosite or ammonium jarosite (～0.4% Co or Ni). Elevated temperatures increase the incorporation of Co or Ni in the jarosite precipitates, but the increase is modest. Increasing concentrations of Na_2SO_4, (NH_4)_2SO_4 or K_2SO_4 result in an increase in the Co and Ni contents of the jarosite precipitates. The extent of Co or Ni incorporation also increases as the pH of the synthesis solution increases. In contrast, elevated concentrations of ferric sulphate reduce the extent of Co or Ni incorporation in jarosite precipitates. The parametric dependencies suggest that Co(Ⅱ) and Ni(Ⅱ) substitute to a limited extent for Fe(Ⅲ) in the jarosite structure, and the X-ray determined cell parameters of the precipitates support this hypothesis. The oxidation of Co(Ⅱ) to Co(Ⅲ) results in a modest increase in the Co content of the jarosite precipitates, but the common presence of poorly crystalline Co(Ⅲ) oxyhydroxide (heterogenite) accounts for at least part of the increase.
机译：在黄铁矿沉淀物中结构上掺入了少量钴和镍，并且随着溶解的钴或镍浓度的增加，掺入的程度增加。黄钾铁矾钾比钠黄铁矾或铵黄钾铁矾（约0.4％Co或Ni）含有更多的钴或镍（Co或Ni≥1％）。升高的温度会增加黄铁矿沉淀物中Co或Ni的掺入量，但增加幅度不大。 Na_2SO_4，（NH_4）_2SO_4或K_2SO_4浓度的增加导致黄铁矿沉淀物中Co和Ni含量的增加。 Co或Ni的掺入程度也随着合成溶液pH的增加而增加。相反，高浓度的硫酸铁降低了黄钾铁矾沉淀物中Co或Ni的掺入程度。参数依赖性表明黄铁矿结构中Co（Ⅱ）和Ni（Ⅱ）在一定程度上替代了Fe（Ⅲ），并且X射线确定的沉淀物细胞参数支持了这一假说。 Co（Ⅱ）氧化为Co（Ⅲ）导致黄钾铁矾沉淀物中Co含量适度增加，但结晶度较弱的羟基氢氧化Co（Ⅲ）的普遍存在至少占增加的一部分。

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