Classification of Stockpiled Material from the Larson Quarry

Abstract

J. L. Shiely Company has contracted the Natural Resources Research Institute to conduct laboratory tests to determine the technical feasibility and to develop preliminary flow sheets and equipment requirements to produce marketable products from minus 5/16-inch stockpiled material at the Larson Quarry. Either screening followed by a spiral classifier or a spiral classifier alone can produce a product containing about 83 percent of the weight and about 6 percent minus 200-mesh material. Flow sheets and equipment requirements are given for both options at 100 and 150 TPH. Based on the equipment requirements the classifier without screening appears to be the best option. Both options use a thickener to treat the classifier overflow. Laboratory tests indicate that it will be feasible to recycle the thickener overflow. Chemical analysis of the minus 200-mesh material, thickener underflow, indicate that the materials should be chemically suitable for agricultural lime.