Benner, Blair R2017-06-152017-06-151987https://hdl.handle.net/11299/188484J. L. Shiely Company has contracted the Natural Resources Research Institute (NRRI) to conduct pilot-plant studies to confirm previous laboratory tests on the classification of minus 3/8-inch material from the Larson Quarry, and to develop the equipment requirements for a commercial plant. In addition NRRI was asked to conduct preliminary tests on a minus 3/32-inch product to determine if this finer feed could be treated in the same equipment as the minus 3/8-inch feed. The pilot-plant tests confirmed the laboratory predictions as to product size and weight recovery. The minus 200- mesh portion of the material supplied for the pilot-plant tests had a much slower settling rate than the previous material which necessitated the use of a flucculent to produce a recycleable thickener overflow. While a successful flocculent was found it may not be the most cost effective and others should be tested. The pilot-plant tests showed that the classification is relatively insensitive to feed rate or percent solids as long as the sand carrying capacity of the machine has not been exceeded.enLaboratory testsFlocculentNatural Resources Research InstituteEquipment requirementsUniversity of Minnesota DuluthTechnical Report