弓长岭磁铁矿石磁脉冲预处理试验研究

研究了磁脉冲预处理技术对弓长岭磁铁矿石磨矿效率和分选指标的影响规律，借助扫描电镜和显微镜进行了预处理前后矿样的微观结构及磨矿产品单体解离度分析。结果表明，在磁脉冲磁场强度为39.81 kA/m条件下处理5 s后，磨矿产物中小于0.043 mm粒级含量与未处理样相比，提高了4.58个百分点；在磨矿时间为9 min，磁选磁场强度为79.62 kA/m时，预处理后试样磁选精矿TFe品位未处理样磁选精矿提高了1.16个百分点，铁回收率较未处理样提高了1.21个百分点；在磁脉冲设备产生的磁应力作用下，矿石内部不同矿物界面结合强度降低，生成扩展裂纹和裂缝，有利于磨矿过程提高铁矿物单体解离度，最终提高矿石的磨矿效率和分选指标。

Experimental Study on Magnetic Pulse Pretreatment of Gongchangling Magnetite Ore

The influence of magnetic pulse pretreatment technology on grinding efficiency and separation index of Gongchangling magnetite was studied. Microstructure of samples and dissociation degree of grinding products before and after pretreatment were analyzed by means of scanning electron microscopy and microscopy. The results show that under the conditions of 39.81 kA/m magnetic field intensity and 5 s pretreatment time, the content of -0.043 mm in the grinding products after pretreatment increases by 4.58 percentage points on average; under grinding time of 9 min, and magnetic separation field intensity of 79.62 kA/m, the TFe grade of the pretreated magnetic concentrate increased by 1.16 percentage points, compared with untreated sample , and the iron recovery increases by 1.21 percentage points on average; under the action of magnetic stress produced by magnetic pulse equipment, the bonding strength of different mineral interfaces in the ore decreases, resulting in cracks, which is beneficial for liberation degree increase in grinding process, and ultimately improving the grinding efficiency and separation index of magnetite.