Abstract: Starch is a commonly used hematite depressor in reverse flotation of hematite and dissolved waste Saccharomyces Cerevisiae contains a polar group similar to starch. Therefore, with single minerals of hematite and quartz as samples and sodium oleate as collector, an investigation is made on the depression effect of the dissolved phase in waste saccharomyces cerevisiae on hematite. The result shows that in single hematite system, at a pH =9, the floating rate of hematite decreases with the dosage of the dissolved component in waste saccharomyces cerevisiae until the hematite is fully depressed. In the hematite and quartz coexistence system, at a pH=11.88 and when calcium chloride is used as activator, the floating rate of hematite can be reduced to 2.47% while that of quartz can be as high as 72.5%, indicating that the dissolved component in waste saccharomyces cerevisiae is a good depressor for the separation of iron from quartz by reverse flotation.

Key words: Dissolved component in waste saccharomyces cerevisiae, Hematite, Quartz, Depressor, Reverse flotation