選鑛製錬に關する鑛物學上の二三の問題
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概要
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In dressing and smelting ores, mineralogical studies on the modes of combination of metallic compounds are of fundametal importance. Some minerals occur in solid solutions or as microscopic intergrowths due to their unmixing. They are especially characteristic of the ores formed at high temperatures at great depth. Others occur in microscopic concentric layers or other complex mixtures, known as metacolloids. They are mostly formed at low temperatures near the surface. Both of these are unfit for pure mechanical dressing, and a systematic combination of dressing and smelting, wet and dry, is neccessary for utilization of different metals contained in such ores. For instance, placer iron in northern Japan mostly consists of magnetite intergrown with ilmenite, which can not be removed by magnetic dressing. Moreover, most of it is richly accompanied by hypersthene, which has been, in the case of terrace placers, partly or completely converted into limonite. This limonite must be wasted by dressing before smelting. but can be utilized by proper combination of smelting and dressing. Such was the case at the Kuji Iron Plant during the war. Similarly, perfect utilization of metals in complex sulphide ores, krown as "black ores" in Japan, can be made only by proper combination of smelting and dressing. Even when copper alone is considerd, it appears as one or several forms of chalcopyrite, bornite, tetrahedrite, enargite, chalcocite and covellite. Copper carbonates, copper oxides and native copper are also accompanied in some cases. Proper treating of such ores can be accomplished only when their nature and modes of combination are well known. Leaching of zinc as sulphate, distillation of the metal from the concentrated ores added to the converter and some other smelting processes may be properly combined with dressing, in order to utilize as perfectly as possible all the metals contained in such ores.
- 1949-10-05