钙镁离子对方铅矿可浮性影响的研究

STUDY ON INFLUENCE OF CALCIUM AND MAGNESIUM IONS ON FLOATABILITY OF GALENA

用实际矿浆滤液研究分析了方铅矿－苯胺黑药浮选体系中对方铅矿可浮性造成严重影响的有害离子。认为大量钙、镁离子的存在对方铅矿的可浮性构成了严重的威胁。钙、镁离子对方铅矿的有害影响主要是阻碍苯胺黑药与方铅矿的作用，使方铅矿表面在有效的氧化还原电位区域内失去了生成苯胺黑药的阳极氧化产物。络合剂六偏磷酸钠和ＥＤＴＡ可以络合液相中钙、镁离子，特别是ＥＤＴＡ还可以络合表面的铅氧化物等，达到清洗方铅矿表面、增进苯胺黑药在方铅矿表面的作用。实际矿样的验证结果与纯矿物研究结论一致。

After analyzing the filtrate of a leadzinc ore pulp,authors found that Ca2+ and Mg2+ were the main hazard ions which could depress galena in galenaN,N′diphenylaminodithiophosphoric acid flotation system.Galena presented very little floatability when concentration of Ca2+ or Mg2+ in pulp was up to 001mol/L separately.Authors further found that PNH anode oxidizing peak on galena missed when concentration of Ca2+ or Mg2+ was about 001mol/L.Therefor,the consequence of little floatability of galena was ascribed to their obstructing influence on reaction of PNH with galena.However,the hazard influence of Ca2+ or Mg2+ on galena was decreased at some extent after adding EDTA or sodium hexametaphosphate.This result has been exploited in a commercial leadzinc ore in China.