In this study, the effect of viscosity of pulp on the classification properties of wet cyclone was investigated. Galenafrom Toyoha mine, Hokkaido district, Japan, was used as a feed of wet cyclone and commercial kaolin sample was used in order to vary the viscosity of pulp. The results of classification tests were estimated by the Tromp partition curve. From the results obtained, the classification point increased with the increase of pulpdensity of kaolin. With the lowering of temperature, the viscosity of pulp increased considerably to increase the classification point.
From the results of this research work, it was found that the viscosity of pulp influenced differently on the classification properties of wet cyclone by the coexistence of such a fine particle as kaolin.

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The separation of galena from sphalerite in a flotation process of complex sulphide ores has usually been carrid out by either a straight differential or a bulk differential flotation method. Cyanides are mainly used as depressant for the separation of Pb/Zn ores. Because of the superiority of cyanides, however, no other depressant has been used until recently. If cyanides are disposed as waste water, it may cause a pollution problem. Accordingly, the flotation separation of galena from sphalerite without the addition of cyanides was investigated in this study as part of intensive studies on the flotation process of complex sulphide ores. In this study, the applicability of the sulphatization process for the differential flotation of Pb/Zn ores was considered. In this method, a Pb/Zn bulk concentrate is partly sulphatized, followed by the depression of galena during sphalerite flotation.

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