湖南某褐铁矿磁化焙烧-磁选试验

以湖南某地隐晶质胶状结构为主的低硫磷褐铁矿样为对象，进行了磁化焙烧及磨选工艺技术条件研究。试验确定的适宜工艺技术条件为：造球用矿样粒度为-0.074 mm占35%、还原煤添加量为矿样质量的10%，适宜的焙烧温度为800 ℃、焙烧时间为80 min，焙烧产物碎磨细度为-0.045 mm占80%、弱磁选磁场强度为90 kA/m，经1粗1精弱磁选，最终可获得铁品位为58.83%、铁回收率为81.19%的弱磁选精矿。

Experiments on the Magnetic Roasting-Magnetic Separation of a Limonite in Hunan

Taking a low-sulfur low-phosphorus limonite with the Aphanitic gel structures in Hunan as a case，the technical conditions of the magnetic roasting and grinding are studied.The optimal technical conditions are determined as follows: the fineness of pelletizing ore is -0.074 mm 35%，the dosage of reducing coal is 10% of the ore samples，the optimum sintering temperature is at 800 ℃ for 80 min，the grinding fineness of the calcined product -0.045 mm accounts for 80%，the magnetic field strength in the low intensity magnetic separation is 90 kA/m.Under the above conditions，the concentrate with Fe grade of 58.83% and Fe recovery of 81.19% was ultimately achieved by the process of one-roughing and one-cleaning low intensity magnetic separation.