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1原理与特点将不纯的金（如粗金、合金、含金废料等）用王水（1份浓硝酸和3份浓盐酸的混酸）溶解生成氯金酸（HAuCl4），以亚硫酸氢钠作为还原剂，特氟金酸还原成金粉沉淀，再进行净化、洗涤、烘干，最后加入助馆剂在高温下熔炼而得颜色为金黄色、纯度达99．9％以上的纯金。该
1 Principle and Features Impure gold (such as coarse gold, alloys, gold-bearing waste, etc.) is dissolved with aqua regia (1 part of concentrated nitric acid and 3 parts of concentrated hydrochloric acid) to form chloroauric acid (HAuCl4) Sodium as a reducing agent, Teflon acid reduced to gold powder precipitation, and then purification, washing, drying, and finally joined the assistant agent melting at high temperatures to obtain a golden yellow color, the purity of 99.9% pure gold. This