Browsing by Subject "Laboratory tests"

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    Classification of Stockpiled Material from the Larson Quarry
    (University of Minnesota Duluth, 1987) Benner, Blair R
    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.
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    Pilot-Plant Classification of Stockpiled Material from the Larson Quarry
    (University of Minnesota Duluth, 1987) Benner, Blair R
    J. 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.