据《世界有色金属》1993年第2期报道,波兰科学家发明了一种从废的镀金黄铜零件回收金的新方法。具体工艺是:先将零件磨碎;将粉末加入含6～35％硫酸和4～10％废硝石溶液中,浸泡8～10小时,使其完全溶解;而后将沉淀物滤出。据报道,100克含64％铜、31％锌、4％金的粉料经上述处理,可得4克金沉淀物, According to “World Non-Ferrous Metals” No. 2, 1993, Polish scientists have invented a new method of recovering gold from scrapped gilded brass parts. The specific process is as follows: firstly grinding the parts; adding the powder to the solution containing 6 to 35% of sulfuric acid and 4 to 10% of waste quarry salt soaking for 8 to 10 hours to completely dissolve the powder; and filtering the precipitate out. It is reported that 100 grams of 64% copper, 31% zinc, 4% gold powder by the above treatment, available gold 4 g precipitate,