<報文>空気中で酸化した磁硫鉄鉱の硫酸浸出

概要

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In order to measure the content of oxygen used for the oxidation of the mineral surface, the combined method of reduction with hydrogen and heating in neutral gas was first tested. This method gave such a satisfactory result as to suit the object under adequate conditions. Oxidized pyrrhotite was next leached in aqueous sulfuric acid in the absence of oxidizing conditions (under nitrogen bubbling). The reaction was followed by an analysis of the dissolved iron content and of the record of platinum electrode potential (vs. S.C.E) in the solution. The results are summarized as follows : i) In the leaching of oxidized pyrrhotite, the induction period was observed at higher potential, and suddenly, the reaction producing H_2S occurred at lower potential. ii) The higher degree of oxidation led to the longer induction period, but beyond a certain degree of oxidation, the reaction of H_2S type did not occur and potential did not show a lower value iii) The induction period at low temperature was longer than at high temperature. From these results, the mechanism of the reaction is discussed in comparison with the leaching under oxygen bubbling.
東北大学の論文
1969-01-30