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妨碍普遍采用硫脲浸出贵金属的主要障碍是药剂耗量大且效率低.现今已研究出一种可广泛使用的新工艺,采用这种工艺,药剂耗量减少到0.5公斤/吨,并能获得高的金属回收率,而且避免了给矿物料的钝化.基本原理是合理地减少了浸出过程中二硫甲脒对硫脲的量.使硫脲量初氧化的部分保持在50%左右.这样就避免了钝化硫的产生和在低的硫脲浓度下为快速溶解金属,氧化还原电位可高达400毫伏以上.也可采用炭浆法或树脂法处理矿浆、采用热硫脲溶液或酸溶液可使贵金属解吸.
A major obstacle to the widespread use of thiourea to leach precious metals is the high drug consumption and inefficiency, and now a widely available new process has been developed that reduces the dosage of pharmaceuticals to 0.5 kg / t and achieves High metal recovery and avoid the passivation of mineral materials.The rationale is to reasonably reduce the amount of thiourea dithiocarbamidine in the leaching process so that the amount of thiourea initially oxidized remains about 50%. This avoids the generation of passivated sulfur and rapidly dissolves the metal at low thiourea concentrations, with a redox potential of up to 400 millivolts or higher.Calcination can also be carried out using either a carbon slurry or resin process, using a thermal thiourea solution or Acid solution can desorb precious metal.