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Electrode of carbon material from bituminous coal and method of making the same

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1. A METHOD OF PRODUCING ELECTRODE CARBON MATERIAL FROM BITUMINOUS COAL, WHICH COMPRISES DE-ASHING A BITUMINOUS COKING SAID COAL TO A TEMPERATURE IN 2.5% BY WEIGHT, COKING SAID COAL TO A TEMPERATURE IN EXCESS OF 700*C. WITH A RATE OF TEMPERATURE RISE THROUGH THE PLASTIC ZONE OF NOT LESS THAN ABOUT 100*C. PER HOUR TO OBTAIN A DENSE COKE IN THE FORM OF A STRONG SWOLLEN CAKE, CALCINING SAID COAL COKE AT A TEMPERATURE OF FROM 1200 TO 1500*C. TO OBTAIN A CALCINED COKE HAVING A SPECIFIC RESISTIVITY OF NOT GREATER THAN ABOUT 0.0025 OHM/ IN./IN.2, A REAL DENSITY OF AT LEAST ABOUT 1.90 G./CC., AND A HARDNESS INDEX OF NOT LESS THAN 35, CRUSHING AND MILLING SAID COKE AND GRADING THE COKE PARTICLES TO PROVIDE AN AGGREGATE OF SUITABLE SIZE CONSIST FOR PRODUCTION OF ELECTRODES.
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