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What Is The Role Of Depressant In Froth Floatation Process

In froth floatation process,depressants helps to separate two sulphide ores by selective prevention of froth formation by one ore and allowing the other to come into frothor example, in order to separate two sulphide ores zns and pbs, nacn is used as a depressantt selectively allows pbs form froth, but prevents zns from coming to froth.