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Sun Shuiyu;Wang Dianzuo;Li Bodan(Department of Mineral Engineering, Central South University of Technology, Changsha, 410083, China)  
Hydrophobicity-hydrophilicity balance relationships for self-induced and sodium sulfide-induced flotations of sulphlde minerals have been esTablished, through solvent extraction-chemical analysis of neutral sulphur (S°) on the surfaces, measurement of redox potential (E., ) of flotation pulp, and flotatlon tests. They may be Indicated as [S°]/[OH-] and respectively. The neutral suphur (S°) was considered to be responsible for the hydrophobicity, the amount ([S°]) of which was controlled by Ept The critical value of [S°] was proposed as a new concept. The hydrophilicity was con tributed to OH ion for the self-induced flotation, and to both HS- and OH-ions for the Na2S-induced flotation. At a given PH value, hydrophobicity and floatablllty increase with [S°]. For different PH values, a higher PH value results in stronger hydrophilicity, and hence the hydrophobicity and flotation require more [S°]. Lower PH values are in correspondence with the smaller [S°].
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