| Overcomminution of mineral particles usually occurs in the grinding process.Overcomminution of mineral particles will lead to resource loss,increase of power consumption and energy consumption,which are unfavorable factors for the development of concentrators.Therefore,some measures are taken to reduce the degree of overcomminution of minerals in the grinding process,such as changing the type of grinder,using new grinding media and adjusting grinding concentration.In this paper,the grinding energy consumption characteristics and grinding fineness characteristics of single ore/binary mixed ore/actual mineral,as well as the grinding of unit ore and binary mixed ore and binary grinding product under different spherical diameters?25mm,20mm and 15mm?nano-ceramic ball grinding were analyzed,taking magnetite and quartz pure mineral and magnetite of-0.3mm as research objects.The energy consumption characteristics and product fineness characteristics of meta-ore grinding are compared,and the grinding behavior characteristics of mono-ore/binary mixed ore/actual mineral under equal mass conversion 16mm steel ball and 20mm ceramic ball grinding mainly include the overall fineness of the product t10,the new-born-0.075mm,the new qualified grade?0.075-0.01mm?and the over-grinding grade content analysis.The energy distribution factor is used to characterize the binary mixed ore.The relationship between grinding products and energy of each component is established and the particle size model of overcomminution is established.Through the above analysis,the following rules are obtained:For blow 0.3mm magnetite and quartz pure mineral,magnetite:quartz mixed binary mineral and three kinds of actual minerals according to the mass of 1:1,the grinding of20mm ceramic ball is more energy-saving,and the qualified grade content of grinding products is higher than the other two kinds of ball-diameter ceramic ball.The grinding behavior of binary mixed ores depends on the composition of magnetite in binary mixed ores.Magnetite is easier to break than quartz.The selective grinding of magnetite by spherical medium occurs not only in binary mixed ores,but also in quartz,which promotes the grinding of magnetite by spherical medium.The size of energy distribution molecule S proves the fineness of separation components in mixed ore.For the grinding of minerals with higher hardness,the nano-ceramic ball with equal mass conversion can achieve the grinding effect of steel ball,save more energy and have lower degree of overcomminution.Calculate the new supercomminution size model of magnetite/quartz/binary mixed grinding products under nano-ceramic ball milling.The model can fit and predict the distribution of overcomminution content.According to the above rules,nano-ceramic ball can be used as an effective grinding medium to reduce the degree of overcomminution in future grinding. |
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