关于金银浸出时电化学催化

提出了金银等贵金属在氰化等浸出过程中原电池抑制和催化作用的机理,首次提出了控制被矿物脉石包裹的金银粒子表面上的电位,使金表面上有利于阳极溶解过程,同时使氧的阴极还原集中于包裹的矿物脉石及其产物表面上。因而既提高了贵金属浸出速度,又阻碍或抑制了矿物脉石的溶解,从而降低了试剂的消耗。这种电化学催化新工艺,原则上适用于所有氧化还原浸出过程,特别适用于难用常规氰化处理的顽固金矿或金精矿。

Electrochemical activation for gold and silver leaching

The mechanism of galvanic depression and electrochemical activation in the cyanide leaching of precious metal, such as Au or Ag was proposed in this paper.It firstly suggested to control the potential of surface of the gold and silver particles partially surrounded by the mineral or gangue for the favouring of the anodic dissolving of gold or silver on their surface and concentrating the cathodic reduction of oxygen at the surfaces of the surrounding minerals and gangue. Thus the leaching rates of precious metals were increased, and the dissolutions of sulphide minerals and gangue were prevented or inhibited.Thus the consumption of the leaching agents was decreased. This electrochemical activation suggested here is specially suitable for direct cyaniding of refractory gold ores which could not be treatel by conventional cyanidation. It is also suitable for all oxy-reduction leaching in principle.