鲕状赤铁矿提铁降钾钠试验研究

采用磁化焙烧-磁选-反浮选工艺回收某鲕状赤铁矿中的铁。磁化焙烧最佳条件为:焙烧温度800 ℃,煤粉用量8%,焙烧时间65 min;反浮选最佳条件为:矿浆温度30 ℃,NaOH用量1 250 g/t、淀粉用量940 g/t、CaO用量750 g/t,捕收剂915BM用量750 g/t。在最佳条件下最终得到产率58.30%、TFe品位63.04%、P含量0.233%、K₂O+Na₂O含量0.22%、铁综合回收率77.56%的铁精矿,实现了该类铁矿石的综合利用。

Beneficiation of Oolitic Hematite with High Content of Phosphorous and Potassium Sodium

A flowsheet of magnetic roasting-magnetic separation-reverse flotation was adopted to recover iron minerals from an oolitic hematite ore. From the closed-circuit test, the obtained optimum parameters for magnetic roasting include roasting temperature of 800 ℃, coal dosage of 8% and roasting time of 65 min; and the optimized parameters for reverse flotation include pulp temperature of 30 ℃, dosages for NaOH, modified starch, CaO and collector 915BM of 1 250 g/t,940 g/t, 750 g/t and 750 g/t, respectively. As a result, an iron concentrate with a yield of 58.30%, TFe grade of 63.04% and comprehensive iron recovery of 77.56% is obtained, while the content of P and K₂O+Na₂O therein are decreased respectively to 0.233% and 0.22%, indicating the comprehensive utilization of this kind of iron resource can be actualized.