Fiber thermomechanical refining is a critical step for the manufacturing of medium density fiberboard (MDF). To increase productivity and improve fiber quality with a reduction in energy consumption during refining, it is essential to determine appropriate refining conditions, such as the chips retention time (accumulated chip height, CH) in the pre-heater, feeding screw revolution speed (SR) i...

Abstract: The specific rate of breakage is one of the most important factors in evaluation of grinding process especially in ball mill. In this article the effect of ball size and feed size on selection function were investigated using batch grinding circuit on two-iron ore anomaly (B, C) from sangan mine in north of Iran. Eight different monosize fractions were prepared between 2000 and 50...

To ensure that these requirements were met, Chinalco and Jacobs Engineering selected ABB as a technology partner and principal supplier of the mine’s electrical and automation equipment. They awarded ABB contracts worth around $120 million to supply three gearless mill drive systems for the semi-autogenous (SAG) mill and two ball mills, a plant-wide electrical solution, and a process automation...

The effects of the milling parameters involving shape powder particles, rotation speed, and ball-to-powder diameter (BPDR) on DEM modeling in planetary ball mill were investigated. BPDR was varied from 1 to 10. results revealed that size particles do not give a significant change simulation when attains maximum value increasing leads increase time size. Hence, effect particle calculated data is...

RATIONALE Isotope analysis of wood is an important tool in dendrochronology and ecophysiology. Prior to mass spectrometry analysis, wood must be homogenized, and a convenient method involves a ball mill capable of milling samples directly in sample tubes. However, sample-tube plastic can contaminate wood during milling, which could lead to biological misinterpretations. METHODS We tested poss...