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非金属二次原料中的元素金在象硫酸铁和过氧化氢这类氧化剂的存在下,很容易被硫脲-硫酸溶液浸出溶解。浸出时间高度依赖于氧化剂的浓度和金复盖的厚度。金以 Au[SC(NH_2)_2]+络合物进入溶液,并且能够用阳离子交换剂几乎全部提取,金渣最大不超过6μm。脱金后的浸出液可再用来浸出,将满载金的阳离子交换剂(含金量约为30—60克/升)煅烧以回收金。通过阳离子交换剂对金和铁的吸附的研究表明,金的吸附纯粹是按离子交换机理发生,金络合物的键要比铁化合物的集强得多。
Elemental gold in non-metallic secondary raw materials is easily leached and dissolved by a thiourea-sulfuric acid solution in the presence of an oxidizing agent such as iron sulfate and hydrogen peroxide. The leaching time is highly dependent on the concentration of oxidizer and the thickness of gold overlay. Gold enters the solution as Au [SC (NH_2) _2] + complex and can be extracted almost entirely with cation exchangers with a maximum of 6 μm gold dross. The de-leached leachate can be reused for leaching and the gold-loaded cation exchanger (gold content about 30-60 g / l) is calcined to recover the gold. Studies on the adsorption of gold and iron by cation exchangers show that the adsorption of gold occurs purely by the mechanism of ion exchange and that the bonds of gold complexes are much stronger than those of iron compounds.