著者

吉川 逸治 松岡 功 下飯坂 潤三

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:03694194)

巻号頁・発行日

vol.102, no.1179, pp.295-300, 1986

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Applicability of dissolved air flotation (pressure type flotation) for separating ultrafine particles has been investigated using barite-quartz and calcite-quartz mixtures as samples.<BR>In pressure type flotation of barite-quartz mixture, good separation is obtained by the addition of smaller amount of sodium oleate as a collector than in dispersed air flotation (Denver type flotation). On the other hand, in pressure type flotation of calcite-quartz mixture, it is difficult to make calcite selectively float from quartz by adding sodium oleate. This may be explained by the reason that heterocoagulation of calcite and quartz particles can not be prevented under a comparatively static condition in pressure type flotation. However, the separation of calcite from quartz by pressure type flotation is possible when selective flocculation of calcite is achieved by using a polymeric flocculant (Separan AP30) with a dispersant such as sodium hexametaphosphate. The separation of barite-quartz and calcite-quartz mixtures by pressure type flotation is accomplished only at low pulp density below 2 to 3%.