Preparation method of fine graphite

Abstract

The invention relates to a preparation method of fine graphite, belonging to the technical field of graphite material. The method comprises the following steps: performing dry mixing to coke fine powder and asphalt fine powder in a weight ratio of 10:1-7:3, heating the mixed powders for 4-8h in a sealed environment with the temperature of 250-350 DEG C and the vacuum degree of no less than 0.005 MPa while vibrating the mixed material to ensure that the density is not less than 1.8g / cm<3>; then adding 30-50t of pressure to the sealed environment, and gradually heating to 900-1200 DEG C to sinter and obtain fine graphite. The preparation method of the invention has simple process, convenient operation, short production cycle and low production cost; the prepared product has better overall volume density, asphalt coking value and qualification rate of the finished products; in addition, the production process is cleaner, the production environment is better and the influence of the production to the dust, atmosphere and water body can be effectively controlled.

Description

(1) Technical field

[0001] The invention belongs to the technical field of graphite materials, in particular to a preparation method of fine-structure graphite. (2) Background technology

[0002] At present, the production of fine structure graphite mainly adopts the traditional kneading and sintering method. Its main process route is: first produce coke fine powder and melt pitch, then knead coke fine powder and melt pitch, and then carry out sheet rolling and secondary powder milling, dry powder cold pressing, repeated roasting, dipping and roasting, and finally graphitization Made of fine structure graphite products.

[0003] The main defect of above-mentioned method is: 1, during the kneading process of coke fine powder and melting pitch, because fine powdery solid coke powder and the bitumen with bigger viscosity of molten shape are when implementing kneading, very easily form pitch permeability The unsatisfactory situation and the difficulty in improving the degree o...