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1970年,日本三菱金属公司大阪精炼厂迠立了一个新的贵金属回收车间。该车间已生产了四年,主要处理直岛冶炼厂和精炼厂的阳极泥,同时也处理小名浜熔炼与糙炼厂的阳极泥。这些阳极泥的特征是硫酸铅的含量高,造成贵金属特别是银的极为频繁的循环。因此,利用浮选法从阳极泥中分离硫酸铅方面作了不少努力。试验室和半工业试验经验指出,用浮选法可有效地将硫酸铅排入尾砂中,使大部分阳极泥均可有效地还原。此外,还发现金银含量丰(宀夫)的精矿极易用回转窑处理,这就排除了常规方法的某些步骤。
In 1970, the Mitsubishi refinery in Japan’s Mitsubishi Metal Corp. set up a new precious metal recycling plant. The plant has been in production for four years and mainly deals with anode slimes at Naoshima smelters and refineries as well as anode slime at Minamisen Smelters and Refineries. These anode slimes are characterized by a high content of lead sulfate, resulting in an extremely frequent cycle of precious metals, particularly silver. Therefore, a lot of efforts have been made to separate lead sulfate from anode slime by flotation. Laboratory and semi-industrial test experience indicates that flotation can effectively discharge lead sulfate into the tailings so that most anode slimes can be efficiently reduced. In addition, it has also been found that concentrates rich in gold and silver (widower) can be easily treated with rotary kilns, which precludes certain steps of the conventional process.