基于压碎指标和分形维数的辉钼矿破碎效果研究

Research on Crushing Effect of Molybdenite Based on Crushing Index and Fractal Dimension

为了探究助磨剂对辉钼矿破碎效果的影响,以伊春鹿鸣辉钼矿为研究对象,采用三聚磷酸钠、六偏磷酸钠和水玻璃为助磨剂,研究了添加助磨剂前后矿石压碎指标和分形维数的变化规律,并讨论了压碎指标和分形维数之间的变化关系。结果表明:辉钼矿的压碎指标与助磨剂浓度、浸泡时间和助磨剂种类显著相关,当助磨剂浓度均为0.05%、浸泡时间均为5 min时,添加六偏磷酸钠、三聚磷酸钠和水玻璃的压碎指标值分别为12.1%、11.8%和11.3%,相比不添加助磨剂分别提高了1.6,1.3,0.8个百分点,表明添加助磨剂增大了辉钼矿的压碎指标,使其更易破碎;添加助磨剂后辉钼矿的分形维数增大,表明助磨剂改变了辉钼矿的颗粒形状和颗粒分布,相比不加助磨剂,添加六偏磷酸钠、三聚磷酸钠和水玻璃的分形维数分别提高了75.7%、66.2%和41.4%;压碎指标与分形维数具有明显的相关性,在一定范围内,碎石的压碎指标会随着分形维数的增大而增大,即助磨剂对矿石的作用效果越好,则碎石的分形维数越大,且压碎指标也越高。

In order to explore the effect of grinding aids on the crushing effect of molybdenite,Yichun Luming molybdenite is taken as the research object,and sodium tripolyphosphate,sodium hexametaphos-phate and sodium silicate are used as grinding aids.The variation rule of ore crushing index and fractal di-mension before and after adding grinding aids is studied,and the variation relationship between crushing in-dex and fractal dimension is discussed.The results show that the crushing index of molybdenite is signifi-cantly related to the concentration of grinding aid,soaking time and the type of grinding aid.When the con-centration of grinding aid is 0.05% and the soaking time is 5 min,the crushing index values of adding sodi-um hexametaphosphate,sodium tripolyphosphate and sodium silicate are 12.1%,11.8%and 11.3%,re-spectively,which are 1.6,1.3 and 0.8 percentage points higher than those without grinding aid,indicating that the addition of grinding aid increases the crushing index of molybdenite and makes it easier to break.The fractal dimension of molybdenite increases after adding grinding aids,indicating that the grinding aids change the particle shape and particle distribution of molybdenite.The fractal dimension of adding sodium hexametaphosphate,sodium tripolyphosphate and sodium silicate increased by 75.7%,66.2%and 41.4%,respectively,compared with that without grinding aids.There is a significant correlation between the crush-ing index and the fractal dimension.Within a certain range,the crushing index of the crushed stone will in-crease with the increase of the fractal dimension,that is,the better the effect of the grinding aid on the ore,the larger the fractal dimension of the crushed stone,and the higher the crushing index.