丁黄药体系铁闪锌矿的浮选行为与电化学研究

研究了以丁黄药为捕收剂时铁闪锌矿的浮选性质, 在酸性条件(pH <6)下, 其回收率约为60%, 在pH>8 的碱性条件下, 其回收率急剧下降;pH=6.0 时, 铁闪锌矿在0.2 ～ 0.6 V 的电位区间, 回收率大于50%;pH=9.18 和pH =11.0 时, 无论怎样调节矿浆电位, 铁闪锌矿浮选回收率低于50 %。从热力学的角度而言铁闪锌矿与黄药的作用有可能产生双黄药X₂ 和黄原酸锌ZnX₂, 但ZnX₂ 稳定存在的区域不大。采用循环伏安电位扫描研究方法, 研究了丁黄药在铁闪锌矿表面的电化学作用机理, 丁黄药在铁闪锌矿表面的吸附和氧化形成疏水性物质的反应不明显;在高碱条件下, 铁闪锌矿自身的氧化严重阻滞了丁黄药在其表面的吸附和氧化形成疏水性物质。电化学试验结果与浮选试验结果能较好地对应起来。

Floatation Behavior and Electrochemistry of Marmatite in Butyl Xanthate Solution

The floatation behavior of marmatite in butyl xanthate solution as collector has been studied. The flotation recovery of marmatite is about 60% at a pH value lower than 6.0, but it decreases sharply at a pH higher than 8.0. It is larger than 50% when the pH is 6 and the pulp potential is in the range from 0.2 to 0.6. While the pH value is 9.18 or 11.0, the recovery is less than 50% no matter what value the potential is adjusted to. Through thermodynamic calculation, it is known that dixanthogen (X 2) and zinc xanthate (ZnX 2) may exist in the butyl xanthate solution due to the reaction of marmatite with xanthate, but the stability of zinc xanthate (ZnX 2) is not high. The electrochemical behavior of marmatite in butyl xanthate solution has been investigated using cyclic volammetry. The results show that the interaction of butyl xanthate with marmatite and its adsorption on the surface of marmatite are not evident. On higher pH condition, the oxidation of marmatite itself badly encumbers the adsorption and oxidation of xanthate on the surface of marmatite.