THE UTILIZATION OF COAL REFUSE FOR THE MANUFACTURE OF LIGHTWEIGHT AGGREGATE
Special Research Report SR-46 The purpose of this investigation was to study the relationship between the washability fractions of coal refuse and the quality of lightweight aggregate products prepared from such refuse. Three samples of current refuse) each weighing three thousand pounds, were collected from preparation plant tipples. The increments of collection were such that the total sample would be representative of the material actually being discarded on the refuse piles. The material was screened and the 1/4 inch by 8 mesh fraction subjected to extensive washability studies. Sink-float separations were made at gravities of 1.40, 1,60, 1.80, 2.00, 2.20, 2.40, 2.60, 2.80 and 2.96 giving ten products which were subject to spectrochemical analysis for the major constituents, These products were individually crushed to 100 percent minus 60 mesh and recombined into ten sink fractions which represent the 1/4 inch by 8 mesh material that would sink at gravities of 2,96, 2.80, 2.60, 2.40, 2.20, 2.00, 1.80, l.60J 1.40, as well as a composite sample. Each fraction, so prepared, was flash fired in an electric Glo-bar furnace for fifteen minutes, as both a pellet and as a powder, at temperatures of 1350°c, 1300°C, and 1250°C. The resulting products were tested for specific gravity, percent expansion and compressive strength. The results of the specific gravity, percent expansion and compressive strength tests showed that the 2.60 sink fraction yielded the product that had the lowest specific gravity, the largest percent product expansion and had the greatest compressive strength. The composite sample produced the product with the highest specific gravity, the smallest percent product expansion and the least compressive strength. The 2.96 sink and the 2.80 sink samples 1 primarily pyrite, oxidized so rapidly that melts were formed which were absorbed by the molds. Results of these fractions, therefore, were not obtainable.
|THE UTILIZATION OF COAL REFUSE FOR THE MANUFACTURE OF LIGHTWEIGHT AGGREGATE
|Attribution-NonCommercial-NoDerivs 3.0 United States
|July 27, 2016
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