Carbon electrodes from bituminous coal
阅读：63发布：2023-05-19
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1. A PROCESS FOR MANUFACTUREING COAL-COKE OF IMPROVED STRENGTH, PARTICLE DENSITY AND CONDUCTIVITY, AND DECREASED POROSITY, SUITABLE FOR USE IN ELECTRODE MANUFACTURE WHICH COMPRISES HEATING COAL CONSISTING ESSENTIALLY OF A BITUMINOUS COKING COAL CONTAINING ABOUT 20-40% VOLATILE MATTER, AND WHICH SWELLS AND BECOMES PLASTIC UPON BEING HEATED TO 400-500* C. TO AN INFUSIBLE, NORMALLY NON-PLASTIC CONDITION AT A TEMPERATURE BETWEEN ABOUT 300* AND ABOUT 550* C., AND IN ANY EVENT TO REDUCE THE VOLATILE CONTENT BY DESTRUCTIVE DISTILLATION, TO BETWEEN ABOUT 8 AND ABOUT 20%, WHICH MATERIAL IS DEFORMABLE UNDER HIGH MECHANICAL PRESSURE AT A TEMPERATURE OF 300-550* C., COOLING AND CRUSHING THE PARTIALLY COKED COAL AND COMPRESSING IT WITHOUT ADDED BINDER AT A PRESSURE OF AT LEAST 2,000 POUNDS PER SQUARE INCH AT A TEMPERATURE BETWEEN ABOUT 350* AND ABOUT 550* C. TO DEFORM AND AUTOGENOUSLY BOND THE PARTICLES TOGETHER, CRUSHING THE RESULTING COMPOSITION TO FORM PARTICLES AND COKING SAID PARTICLES ABOVE ABOUT 700* C. TO A VOLATILE CONTENT BELOW ABOUT 2%.
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