<報文>金銀鑛青化試驗報告

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In compliance with the requests of mines, cyanidation tests were undertaken of two species of special ores by means of a small-shaped Pachuca tank. In the tests with ore from A mine containing a relatively large amount of hematite and limonite and some copper mineral as shown in Table 1,it was found that gold and silver dissolution proceeded satisfactorily under usual conditions, as shown in Figs.1 and 3,but cyanide consumption was markedly high as compared with that in the case of common practice. An addition of lime in excess resulted in improvement of gold and silver dissolution and in decrease in cyanide consumption, but pretreatments before cyanidation, namely, air agitation of the ore with solutions of lime in excess, had practically no effect as shown in Fig.2. High cyanide consumption seemed to be due to the existence of copper mineral as well as of iron oxides. In the tests with a specially extracted ore from B mine, in which presumably 80 per cent of the silver content was present as pyrargyrite, gold dissolution proceeded without difficulty under usual conditions, but silver dissolution was extremely slow and its extraction did not exceed 23 per cent even with a profitable addition of lead acetate, as shown in Figs.4 and 5. By examining the accelerating effect of various oxidizing agents, such as H_2O_2,bleaching powder, PbO_2,BaO_2 and KMnO_4,on silver dissolution, barium peroxide was found to be most effective, as shown in Figs.6,7,and 8.
東北大学の論文
1951-10-03

<報文>金銀鑛青化試驗報告

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