内蒙古磁铁矿选矿工艺探讨

Discussion on Ore Dressing Process for Neimenggu Magnetite

内蒙古磁铁矿矿石性质较复杂,含铁36.22%,含硫1.197%,磁铁矿嵌布粒度细,有害元素硫不易脱除,研究确定了先浮后磁的选矿工艺流程。采用反浮选脱硫,并通过试验确定了磨矿粒度-0.074mm90%、异戊黄药用量150g/t、2#油用量60g/t、矿浆pH值为5.5、硫酸铜用量400g/t的最佳选矿条件,验证试验表明,铁精矿品位可达64.81%,铁回收率72 82%,铁精矿含硫仅为0.415%。

The ore characters of Neimenggu magnetite are complicated, which contains 36.22%Fe and 1.197%S and have thin mosaic granularity, harmful element sulphur is difficult to get rid of, therefore the ore dressing process of magnetic dressing after flotation is determined. Using reverse flotation for desulphuration, the best dressing conditions are confirmed by testing, such as the liberation grind of (-0.074 mm) ore is 90%, the dosage of sodium iso-amyl xanthate is 150g/t, the dosage of 2~#oil is 60g/t, the pH value of the ore pulp is 5.5 and the dosage of bluestone is 400g/t. Validating tests show that the grade of iron ore concentrate, which only contains 0.415%S, can reach to 64.81% and the iron recovery ratio is 72.82%.