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研究了一种从含锑及含银小于0.01%的粗铅除银的方法。该法包括加热粗铅到400℃和往粗铅加钙。加入的钙与粗铅中的锑及银反应生成Ag—Sb—Ca化合物,此化合物上浮到融体表面形成富银浮渣。此富银浮渣与除银铅分离,并可随之处理以回收银。为了得到高的除银效率、大量节省能源、缩短过程时间和节省劳力,过程在400℃进行。
A method of silver removal from crude lead containing antimony and less than 0.01% silver was studied. The law includes heating crude lead to 400 ° C and adding calcium to the crude lead. The added calcium reacts with antimony and silver in the crude lead to form Ag-Sb-Ca compound, which floats on the surface of the melt to form silver-rich scum. This silver-rich scum is separated from silver and lead and can be disposed of to recover silver. In order to get high silver removal efficiency, save a lot of energy, shorten the process time and save labor, the process at 400 ℃.