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在硫酸铁(Ⅲ)或过氧化氢作为氧化剂存在时,用硫脲的硫酸溶液很容易溶解非金属再生原料上的金,浸出时间与氧化剂浓度及金涂层的厚度有密切关系。金以Au[SC(NH_2)_2]_2~+络合物形式溶解,用阳离子交换剂几乎可以全部提取,剩余的金不大于6μM。无金浸出液可以返回浸出,饱和的阳离子交换树脂(金含量约为30—60克/升)进行煅烧提取金。 阳离子交换剂吸着金和铁的研究指出,金的吸着纯粹是通过离子交换机理发生的,金络合物的结合力要比铁的化台物强得多。
In the presence of iron (III) sulfate or hydrogen peroxide as oxidant, the gold on the non-metallic regeneration feedstock is easily dissolved in sulfuric acid solution of thiourea. The leaching time is closely related to the concentration of oxidant and the thickness of the gold coating. Gold is dissolved in the form of Au [SC (NH_2) _2] _2 ~ + and almost all of it can be extracted with cation exchanger with the remaining gold not more than 6μM. Gold-free leaching solution can be returned to the leaching, saturated cation exchange resin (gold content of about 30-60 g / L) calcined extract gold. Studies on the sorption of gold and iron by cation exchangers indicate that sorption of gold occurs purely through ion exchange mechanisms and that the binding affinity of gold complexes is much stronger than that of iron compounds.