INVESTIGATION OF NEW METHOD OF MAGNETIC SEEDING FOR CONCENTRATION OF DONG'ANSHAN HEMATITE ORE

An attempt was made to develop the new method of magnetic seeding for concentration of Dong'anshan hematite ore, on which the influence of such factors as magnetic seed dose rate, stirring time, dose rate and proportion of collector-agglomerant, density and speed of repulping pulp conditioning, quality of water, pH of medium, etc. has been systematically investigated and discussed. It was shown that the vigorous stirring and high density contribute to agglomeration magnetic seeding process. A diagramatic flowsheet illustrating the separation process by magnetic seeding and its classification was established. A concentration grade of 66.85% Fe and recovery of 99,02% as well as waste tailing of 0.67% Fe were obtained by using this new method from a synthetic mineral mixture of hematite and quartz(1:1). And also concentrates containing 53.1% Fe and recovery of 95.3% were yielded from Dong'anshan crude ore assaying 32%Fe. This results have been verified by the tests of same procedure for Sijiayin hematite ore. Preliminary industrial practice seems to make sure of that the separation process utilizing the magnetic seeding would have potential possibility for concentration of Dong'anshan hematite or other similar ores.