Study on Grinding Behavior Characteristics under Low-Speed Grinding Condition

Abstract

In order to explore the crushing mechanism of minerals, this paper attempts to eliminate the throwing effect of media and study the grinding characteristics of minerals only under the action of abrasion force. In this paper, the method of removing the throwing state of media is to adjust the mill to a lower rotational speed, so that the grinding media are all in a cascading state. Three single-component pure minerals, quartz, pyrrhotite, and pyrite, commonly found in complex ores, were selected as research objects to study the grinding behavior characteristics of the three minerals only under the force of abrasion. The effects of mineral species, feed-particle sizes, grinding time, and other factors on the particle-size distribution and product-generation rate of grinding products are studied. The results show that from the particle-size distribution of grinding products, the yield of coarse particles is the highest, while the yield and t10 value of other fine particles are very low. The feed-particle size and the hardness of the mineral sample affect the grinding behavior. The product particle size is mainly 0.71 times the feed-particle size, and the other fine particle sizes generated are less than 0.5 times the feed-particle size.

Research on the Grinding Process of Superhard Particles in the Fluidized Bed Opposed Jet Mill Based on the CFD-DEM Methodology

“…Taking quartz as an example, it is an oxide of silicon, characterized by a crystalline framework structure [3], and classified as a superhard material with high hardness (Mohs hardness of 7) and low brittleness. Consequently, it poses challenges in terms of crushing difficulty, strong equipment wear, and a wide particle size distribution of the grinding product [4,5]. Following the grinding process, quartz undergoes multiple processing techniques to yield silica micro-powder with superior performance.…”