微波还原-磨矿磁选对鲕状赤铁矿提铁脱磷的影响

Influences of grinding and separating parameters for iron increase and phosphorous reduction of oolitic hematite reduced via microwave heating

采用微波加热还原-磨选技术研究鲕状赤铁矿的提铁脱磷条件,且探索最佳磨选条件。在原矿粒度小于0.18 mm占90%、配碳系数1.0、碱度系数0.8、脱磷剂用量15%(质量分数)的条件下,采用微波加热在950℃下还原30 min获得金属化球团,对金属化球团进行破碎、研磨,考察磨矿粒度、磁选强度对铁粉铁品位、回收率、P含量、脱磷率的影响规律,并对还原样品、磁选后的铁粉和非磁性渣进行了扫描电镜、能谱和X射线衍射分析。研究结果表明,金属化球团在研磨粒度小于0.045 mm占62.90%、磁选强度65 mT条件下,可获得铁粉铁品位87.69%、回收率77.86%、P质量分数0.30%、脱磷率86.37%。

The influences of grinding and separating parameters for the iron increase and phosphorous reduction of oolitic hematite reduced via microwave heating were investigated.Under the condition that the raw ore particle size was less than 0.18 mm accounting for 90 mass%,the carbon distribution coefficient was 1.0,the alkalinity coefficient was 0.8,and the amount of dephosphorization agent was 15 mass%,the metallized pellets were achieved via 950℃microwave heating for 30 min.After crushing and grinding for metallized pellets,then the influences of granularity and magnetic field intensity on iron grade,recovery,phosphorus content and dephosphorization rate of iron powder were subsequently studied.The morphologies,element distributions and phase compositions of reduced sample,iron powder and slag were analyzed by using SEM,EDX and XRD techniques.The experimental results show that under the conditions of grinding particle size less than 0.045 mm accounting for 62.90 mass%and magnetic separation intensity of 65 mT,the corresponding indexes,i.e.,iron grade and recovery,phosphorus content and dephosphorization rate were achieved as 87.69%,77.863%,0.30%and 86.37%,respectively.