A Research on the Treatment of Complex Sulphide Ores. III : Selective Sulphatization Process
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概要
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With the aim of recovering zinc, copper. lead, iron and sulphur from complex sulphide ores, the selective-sulphatization flotation process has been proposed by the Institute. Complex sulphide ores are treated with , bulk flotation. The concentrate, after being reground, is subjected to the treatment of selective sulphatization. The object of the treatment lies in sulphatizing only the zinc and lead sulphides as far as possible, with minimum sulphatization of pyrite and chalcopyrite. In the treatment, the bulk concentrate is mixed with comparatively concentrated sulphuric acid, the mixture being kept at a temperature of around 150℃ for one hour. The sulphatization product is leached out with water, and the resultant zinc sulphate solution can be electrolysed for zinc. On the other hand, chalcopyrite, pyrite, and lead sulphate can be recovered from the leach residue by application of differential flotation. In the present report, the research on the selective sulphatization and the electrolytic recovery of zinc is given. First, to find out basic data for the treatment, a variety of sulphide minerals were subjected to the action of sulphuric acid of high concentration and the degree of sulphatization was examined. From the results, it was found that zinc minerals, including zinc blende and marmatite, galena, and pyrrhotite were readily sulphatized, while chalcopyrite and pyrite were almost unaffected. Second, the flotation concentrates from Hanaoka Mine, having the chemical composition as shown in Tables 2 and 4, were treated with the selective sulphatization. The representative result gave 97% of sulphatization percentage for zinc, while 3.6% and 2.0% for iron and copper, respectively. Optimum conditions for the tests were as follows : Concentration of H_2SO_4, 60 vol%; solid-liquid ratio, 1 : 1 ; treating time, 1 hr and treating temperature, 150〜160℃. The solution leached out from the sulphatization product was subjected to tests for production of zinc under the electrolysis process in usual practice and the cathode zinc of 99.97% purity, containing 0.024% of lead, 0.0046% of copper and 0.0029% cadmium, was obtained. Finally, similar tests were repeated on a larger scale and the good results were also obtained.
- 東北大学の論文
著者
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ONO Kenji
Forestry and Forest Product Research Institute
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ONO Kenji
The Research Institute of Mineral Dressing and Metallurgy
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KAMEDA Mitsuo
The Research Institute of Mineral Dressing and Metallurgy
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KANNO Hiroshi
The Research Institute of Mineral Dressing and Metallurgy
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IZUMI Nobuo
The Research Institute of Mineral Dressing and Metallurgy
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