Merging of photo- and mechanochemical activation permitted studying the role of eosin Y in the borylation of aryldiazonium salts in a ball mill. Simultaneous neat grinding/irradiation of the reactants and the photocatalyst led to the formation of boronates in a molten state. On the other hand, the catalyst-free liquid-assisted grinding/irradiation reaction also led to product formation, featuri...

Mill load (ML) estimation plays a major role in improving the grinding production rate (GPR) and the product quality of the grinding process. The ML parameters, such as mineral to ball volume ratio (MBVR), pulp density (PD) and charge volume ratio (CVR), reflect the load inside the ball mill accurately. The relative amplitudes of the high-dimensional frequency spectrum of shell vibration signal...

The objective of this thesis is to optimise the fragmentation at Boliden Minerals open pit mine Aitik. Blasting is one of the main operations in mining, and its performance has a major impact on the overall economy of the mine. The fragmentation process affects not only the local productivity and unit costs of the mining department. It also affects the performance of the subsequent comminution ...

Aiming at predicting what happens in reality inside mills, the contact parameters of iron ore particles for discrete element method (DEM) simulations should be determined accurately. To allow the irregular shape to be accurately determined, the sphere clump method was employed in modelling the particle shape. The inter-particle contact parameters were systematically altered whilst the contact p...

Gearless mill drives are a well established solution for grinding applications in the minerals and mining industries. The paper describes the functionality and technical features of such drive systems as well as their advantages compared to other drive solutions. Due to the variable speed operation the grinding process can be optimized for ores with varying grinding properties. This leads to si...

Many procedures have been described (Umbreit et al., 1957) for the mechanical rupturing of yeast and bacterial cells. These techniques vary from simple hand grinding with abrasives to the use of extrusion or high speed shaking devices. These techniques, although generally satisfactory when dealing with small quantities of cells, are unsuitable for breaking larger quantities of cells required in...

In the present work, fine grinding of limestone was performed by using a super centrifugal mill (SC-mill), type bead mill. The feed sample contained particles below 75 μm in size ground crusher with slurry density 30 mass%. eff ects operational conditions including rotor speed, time, size, and mass beads on grindability were investigated, as well wear beads. evaluated through products 1 measure...