Kinetics Of Grinding Research Articles

The applicability of the first-order grinding law to particles having a distribution of strengths

The applicability of the first-order law of grinding kinetics is widely observed. On the other hand, tests of compressive strengths of particles of a given size show a distribution of strengths, so that some particles appear weak and others strong, which would not lead to first-order kinetics of grinding. It is proposed that this paradox is partially resolved by considering the distribution of compressive strengths to arise from orientation of particles, so that a given particle would have an apparent distribution of strenghts if it could be fractured in different orientations.

Fundamental Research on Continuous Operation of Powder Handling Processes

From the engineering viewpoint, continuous operation of powder handling processer is based on solids flow theory and rate equations incorporated with the techniques of process measurement and control. Establishing these theories, and then giving fundamental items such as material properties of solids, structure of epuipments and operational conditions, it would be possible to predict various phenomena relating to powder and inversely to design proper equipments as well as to select optimum conditions. At the same time, development of measuring and controling instruments is essential to continuous processes.This article briefly presents systematic analyses on the mechanism of solids flow in relation to the unit operations of storage, supply, transport and sieving at first and then the kinetics of closed-circuit grinding, further followed by automatic detecting techniques of particle flowrate, mixing ratio and particle size.

Kinetics of dry grinding of quartz glass (fused quartz)

We studied the kinetics of dry grinding of quartz glass in a ball mill. We determined the dispersion of the powders at different stages of grinding and showed that it is markedly retarded with the attainment of a specific surface in the powder of about 14,000 cm2/g.