銅鉱および亜鉛鉱の試金方法

概要

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(1) The lead button obtained from the crusible fusion of Cu ore, which consists mainly of chalchopyrite, by the normal iron nail method usually contains less than 2 g of Cu. Therefore, cupellation can be performed correctly. On the other hand, if the Cu/S ratio in the Cu ore is higher, for example, an ore consisting of chalchocite at a higher percentage, gives a lead button containing the greater part of Cu, and brings about difficulty in cupellation. In this case niter method can be used.<BR>(2) In case of the crusible fusion of ore containing a large amount of Cu, the phase of matte is educed if the silicate degree of the slag is increased, and the content of Cu in lead button decreases. The formation of matte decreases seriously the recovery of Au and Ag in lead button, especially of Ag. The partition coefficient of Ag between lead/matte is about 4.5<BR>(3) In case of iron nail method, the crusible fusion of a Cu ore containing more than 0.3 g of As educes the phase of speiss. The speiss holds a lot of Au and Ag. The partition coefficient between lead/speiss is about 2.3 for Au and about 7.7 for Ag.<BR>(4) For the concentrate of Zn sulfide ore, niter method is suitable. And for the Zn ore having a small reducing power, for example, calcined Zn concentrate, excess-litharge method is suitable. In these cases, the slag-loss of Au and Ag is negligiblly small.
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