Controlled reagent introduction in a magnesite ore concentration process

Claim 1

IN THE FROTH FLOTATION SEPARATION OF MAGNESITE FROM SILICEOUS AND CALCAREOUS IMPURITIES CONTAINED IN THE ORE, IN WHICH DESLIMED MAGNESITE ORE IN A FLOTATION SIZE RANGE IS PULPED AND INTRODUCED INTO A FROTH FLOTATION CONCENTRATION STAGE, THE IMPROVEMENT WHICH COMPRISES MIXING A SELECTED GROUP OF DEPRESSANT REAGENTS FOR SILICEOUS AND CALCAREOUS IMPURITIES IN PREDETERMINED PROPORTIONS IN A LIQUID CARRIER, SUBJECTING THE MAGNESITE ORE PULP TO AGITATION AND AERATION IN THE FLOTATION STAGE, INTRODUCING THE PRE-MIXED DEPRESSANT REAGENTS INTO THE PULP IN SAID STAGE AT A PREDETERMINED RATE, AND STAGE-ADDING AN ONLY MAGNESITE COLLECTOR REAGENT TO THE PULP IN THE FLOTATION STAGE IN STARVATION AMOUNTS AT INTERVALS IN ITS PROGRESSIVE FLOW THROUGH THE FLOTATION STAGE SO AS TO PROMOTE FLOTATION OF PORTIONS OF THE TOTAL MAGNESITE CONTENT AT EACH INTRODUCTION STAGE OF SIAD PROGRESSIVE FLOW.