湖南某褐铁矿磁化焙烧—磁选试验

摘要

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.%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90kA/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.