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最近,美国矿山局研究了一种从复合铅-锌硫化矿中回收金、银和付产铅的水冶工艺.在40℃,用氯化铁(FeCl_3)预浸6小时的条件下,可提取50%的锌,并生成不溶化的氯化银和氯化铅,然后在酸性硫脲中,温度为40℃的条件下浸出1～3小时,可提取出约85%的金和银。剩余的浸渣用 NaCl 溶液,在55℃的条件下,浸一小时可将氯化铅溶解,然后,在电解槽中,采用阳离子选择性渗透膜从该盐水溶液中回收铅,条件为:电流效率95%,电流密度100安/米~2。使用过的 FeCl_3浸出液在电流效率75—95%的条件下,可在阳极间隔氧化再生。
Recently, the US Bureau of Mines investigated a hydrometallurgical process for the recovery of gold, silver and coproduct lead from composite lead-zinc sulphide ores at a temperature of 40 ° C for 6 hours with a prepreg of ferric chloride (FeCl 3) 50% zinc is extracted and insoluble silver chloride and lead chloride are formed. After leaching for 1 to 3 hours in acidic thiourea at a temperature of 40 ° C, about 85% of the gold and silver can be extracted. The remaining leach residue is treated with NaCl solution at 55 ° C for one hour to dissolve the lead chloride and then the lead is recovered from the brine solution using a cation selective permeable membrane in the cell under the following conditions: current Efficiency of 95%, the current density of 100 A / m ~ 2. Used FeCl_3 leaching solution at the current efficiency of 75-95% of the conditions, the oxide regeneration at anode intervals.