It is an object of the present invention to pro videan improved process of obtaining concentrates low in silica from such silicious magnetitebearing materials which process minimizes the amount of fine grinding necessary.
By the process above described one achieves in a most economical manner a satisfactory division of the silicious magnetite bearing material into a low silica concentrate and a highly silicious 34tailing34 substantially freed from magnetic iron mineral without having to fine grind more than a minor part of the total charge of starting material.
The magnetite recovery and desulfurization ratio in flotation concentrate as a function of pH with mixed collector NaBX 75 gt BX 2 50 gt NaSiF 6 500 gt pine oil 46 gt It is well known that pyrrhotite is a reactive sulphide mineral and easy to be oxidized in alkaline solutions 16.
US2388471A US508849A US50884943A US2388471A US 2388471 A US2388471 A US 2388471A US 508849 A US508849 A US 508849A US 50884943 A US50884943 A US 50884943A US 2388471 A US2388471 A US 2388471A Authority US United States Prior art keywords magnetite magnetic particles silicious concentrate Prior art date 1943 11 03 Legal status The legal status is an.
For effecting this magnetic separation step there was used a three drum Steil39ensen magnetic separator Each drum was five inches wide and twelve inches in diameter This separator is of the wet low intensity direct current type and is manufactured by the Jeffrey Manufacturing Company of Columbus Ohio.
The underflow product from this froth flotation step was a concentrate containing 65 36 Fe and 6 80 silica and represented 70 85 by weight of the cell feed The flotation froth was made up mostly of magnetite quartz middling grains containing 58 12 Fe and 15 16 silica.
By this procedure a low silica concentrate was achieved in an economical manner by segregat ing the middling grains and fine grinding only that part of the initial magnetic concentrate which required such grinding.
Illustrative of cases wherein re grinding and re processing are not economically justifiable.
I but wherein there may be produced products con 11 96 Fe and 74 88 silica.
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