METHOD OF FINAL CONCENTRATION OF MAGNETITE CONCENTRATES Russian patent published in 2002 - IPC

FIELD: concentration of minerals; final concentration of magnetite concentrates at high content of sulfur. SUBSTANCE: magnetic concentrate after magnetic concentration or magnetite-containing product of one of stages of magnetic concentration is subjected to attrition re-grinding during three minutes followed by conditioning in presence of sulfuric acid, xanthate of alkali metal and additionally introduced modifier - oxyethylated high-molecular compound followed by flotation according to scheme including rough and control floatations. Sulfides (pyrrthotine) is separated in front product. Used as modifier is oxyethylated alkyl phenol OП-4-4 or ОП- 10 or polyethylene glycol ester alkyl phenol neonol or oxyethylated amine OKC of oxyethylated fatty acid-ОЖК. EFFECT: complete removal of sulfides. 2 tbl, 3 ex