Preparation method of graphite for single crystal thermal field

The invention discloses a preparation method of graphite for a single crystal thermal field, and relates to the technical field of graphite preparation. Comprising the following steps: 1) proportioning: a mixture of petroleum coke and pitch coke is taken as a raw material A, the mass ratio of the petroleum coke to the pitch coke in the raw material A is 35-40: 10-15, the raw material A is prepared by crushing the petroleum coke and the pitch coke in crushing equipment, calcining is performed after crushing, the calcined petroleum coke and pitch coke are introduced into a flour mill to be milled into powder, and then the powder is screened to obtain the material A; the method has the beneficial effects that polyoxyethylene and chitosan are adopted to modify the asphalt, the cohesiveness of the high-temperature coal pitch is improved, the calcining insufficiency of the calcined petroleum coke and the calcined pitch coke is improved, more shrinkage is achieved in the roasting and graphitizing procedures, the car