鄂西某高磷鲕状赤铁矿磁化焙烧及浸出除磷试验

针对鄂西某高磷鲕状赤铁矿(铁品位43.50%),在实验室条件下采用磁化焙烧—磁选工艺获取铁精矿,并对该铁精矿进行酸浸、生物浸出除磷试验。研究结果表明,在焙烧温度850℃,焙烧时间25min,还原剂用量为矿石质量的5%,磨矿时间4min,磁场强度120kA/m条件下,得到铁精矿铁品位为54.92%,铁回收率为86.78%,P含量为0.83%;酸浸试验中矿浆浓度2%,分别用0.1mol/L的H2SO4,HNO3,HCl,草酸(C2H2O4),柠檬酸(C6H8O7)除磷,其中H2SO4除磷提铁效果最佳,铁精矿品位为57.98%,回收率为96.47%,除磷率为95.30%;生物浸出试验中矿浆浓度2%,用嗜酸氧化亚铁硫杆菌(At.f菌)对铁精矿作用后,磷含量为0.23%,用黑曲霉菌滤液对铁精矿作用后,磷含量为0.20%。

Research on Magnetic Roasting and Leaching Dephosphorization of High-phosphorus Oolitie Hematite in Western Hubei

Roasting -magnetic separation was used to treat a high-phosphorus oolitic hematite in western Hubei(iron grade at 43.50%)，dephosphorization methods，including acid leaching and bioleaching，were used for the iron concentrate.The results showed that,under the condition of roasting at 850 ℃ for 25 min，reductant to ore ratio of 5%，grinding time of 4min，magnetic field strength 120 kA/m，the iron concentrate grade was 54.92%，iron recovery rate was 86.78%，with P 0.83%; in the acid leaching test，pulp density was 2%，with 0.1 mol /L of H₂SO₄，HNO₃，HCl，C₂H₂O₄，C₆H₈O₇ for phosphorus removal，in which H₂SO₄ was the most effective，and the iron grade，recovery rate，phosphorus removal rate were 57.98%，96.47%，95.30%，respectively; in the bioleaching test，pulp density was 2%，with the filtrate of the Acidophilic Thiobacillus ferrooxidans (At.f)  and the  Aspergillus niger  on iron concentrate ore，the phosphorus content were  0.23%, 0.20%, respectively.