According to Equation , the cassiterite flotation rate is almost twice that of calcite. Figure 5a shows that at the initial stage of flotation , the cassiterite particles tended to float to the flotation pulp surface, forming stable mineralized froths.
The first stage of work involved vacuum flotation tests with pure cassiterite samples. These samples were obtained fran high grade concen trates which were further purified by gravity, flotation and magnetic methods. Samples for bench tests, continucus tests in laboratory, and pilot
The nominal size range for cassiterite flotation is between 2 and 100 microns. The top size is variable depending upon the liberation of the cassiterite particles. Cassiterite grains coarser than 100 microns are difficult to float whilst grains finer than 2 microns give selectivity problems. Hence the feed for cassiterite flotation should be reduced to 95% minus 100 microns and then deslimed at 2 microns to give a feed containing no more than 8% minus 2 microns.
Flotation separation of cassiterite from fluorite is successfully achieved using SPA as a collector. Cu is an effective and selective inhibitor for cassiterite/fluorite flotation separation. The interaction between Cu in pulp and SPA is stronger than that between fluorite and SPA.