The Greenwich Collieries Co. is a subsidiary of the Pennsylvania Mines Corporation, and a wholly owned subsidiary of the PP&L Co. which serves the northeastern
The combustion of pulverized coal is a century-old practice. Many people have investigated coal dust and the residual fly ash particles that remain after combustion.
A closed grinding circuit, typified by a ball mill-cyclone combination, is often required to treat a feed comprised of a variety of minerals of differing
Table of ContentsWet Grinding of OresFluidity Control Using Chemical Additives in the Wet Grinding Laboratory and industrial grinding tests have shown that the process of
Table of ContentsTrucks’ waiting timesActivity times and their standard deviationsDistribution of shovels and trucks The calculation of open pit operations’ capacities has been the subject
Table of ContentsMathematical Formulation of the ProblemSolution of the Mathematical FormProgram Description Calculating material flows from analytical data by means of the standard two-product formulas
Table of ContentsFrictional Resistance Due to Imprint (Ky1)Belt and Material Flexing Resistance (Ky2 + Ky3) The frictional resistance to motion of a belt conveyor has
Table of ContentsSoft Start ControlDual DrivesMultiplexing Conveyor Soft-Start Controls Conventional belt conveyors are powered by electric or electro-mechanical drives mounted at the conveyor’s head, tail,
Mill ball charging systems have undergone little change during the past two decades. Most operations utilize a locomotive/ball car combination to load and haul charges
Table of ContentsPlant DescriptionCommissioning There are presently in use many grinding mill control schemes and concepts. In this case, one operating method of controlling the