▎ 摘　　要

NOVELTY - Isotropic and isostatic pressing graphite material comprises aggregate, powder, a binding agent and an impregnating agent. The aggregate is needle-shaped petroleum coke, having true density of greater than or equal to 2.13 g/cm3, ash content of less than or equal to 0.20%, volatility of less than or equal to 0.25%, sulfur content of less than or equal to 0.40%. The powder material is graphene oxide and semi-reinforcing carbon black, the graphene oxide has a particle size of 35-40 nm, purity of 99.90-99.99%, the reinforcing carbon black has a particle size of 45-50 nm, resistance rate is 0.6-0.9 mu Omega .m, and the pH of 7.5-9. USE - Used as isotropic and isostatic pressing graphite material. ADVANTAGE - The method improves the rate of isostatic graphite products; and completely meets the physical and chemical value of the product. DETAILED DESCRIPTION - Isotropic and isostatic pressing graphite material comprises aggregate, powder, a binding agent and an impregnating agent. The aggregate is needle-shaped petroleum coke, having true density of greater than or equal to 2.13 g/cm3, ash content of less than or equal to 0.20%, volatility of less than or equal to 0.25%, sulfur content of less than or equal to 0.40%. The powder material is graphene oxide and semi-reinforcing carbon black, the graphene oxide has a particle size of 35-40 nm, purity of 99.90-99.99%, the reinforcing carbon black has a particle size of 45-50 nm, resistance rate is 0.6-0.9 mu Omega .m, and the pH of 7.5-9. The binding agent is medium temperature coal tar pitch, having softening point of 83-86 degrees C, coking value of greater than or equal to 51%, ash content of less than or equal to 0.25%, quinoline insoluble matter of less than or equal to 0.30%. The weight ratio of the graphene oxide is 15-20%. The weight ratio of semi-reinforcing carbon black is 15-20%. The weight ratio of needle-shaped petroleum coke is 65-70%. The weight ratio of aggregate and binding agent is 70-75:25-30. An INDEPENDENT CLAIM is also included for preparing the graphite material comprising (i) subjecting needle-shaped petroleum coke aggregate to crushing treatment; (ii) sieving the crushed needle-shaped petroleum coke aggregate material; (iii) preparing raw materials by taking 15-20% graphene oxide, 15-20% semi-reinforcing carbon black, 65-70% needle-shaped petroleum coke, 70-75% aggregate and 25-30% binding agent; (iv) carrying out dry blending by pouring the materials into a mixing pot, where the mixing pot temperature is 220-250 degrees C, aggregate dry mixing temperature is 130-140 degrees C and dry mixing time is 45-50 minutes, and carrying out wet mixing of binding agent at 140-150 degrees C for 40-45 minutes; (v) pouring the mixed paste into a molding container, pre-compressing under pressure of 25 MP for 5 minutes and molding; (vi) crushing the preformed billet using a crusher to a required particle size of 25-30 mm; (vii) grinding powder by using mill, crushing the blank until the particle size of the ground powder is not less than 0.80 mm; (viii) re-sieving and grading the powder, and storing; (ix) uniformly mixing the powder in a cyclone mixer; (x) placing the uniformly mixed powder into a rubber mold, sealing, performing cold isostatic pressing, molding under pressure of 150 MP, maintaining the pressure for 7 minutes, to obtain green blank having bulk density of 1.76-1.80 g/cm3; (xi) placing the molded green blank in a graphite dry pot, filling with metallurgical coke powder, and tapping in a circular roaster, filling coke powder, quartz sand and river sand into a furnace under the condition of absence of air, heating gradually for 376 hours according to the temperature curve, and then naturally cooling to room temperature and baking; (xii) preheating the calcined product to 300-350 degrees C, maintaining for 8 hours, adding into an impregnating tank, vacuumizing under pressure for 2.5 hours, then adding an impregnating agent into the impregnating tank, maintaining the pressure for 2 hours, where the impregnating weight gain rate is 17-19%; (xiii) adding impregnated products with rapid sintering asphalt placed in a tunnel-shaped kiln, where the maximum temperature is 750 degrees C, and time is 192 hours; and (xiv) carrying out graphitization by placing the product into Acheson graphitizing furnace after the second roasting, under isolated air conditions, heating the roasted calcined product to 2750-3200 degrees C by current, so that the two-dimensional structure of carbon products are converted into three-dimensional graphite grid structure.