Method for accurately controlling impurity removal effect in graphite high-temperature purification

The invention belongs to the technical field of graphite purification, and discloses a method for accurately controlling the impurity removal effect in graphite high-temperature purification, which comprises the following steps: weighing a plurality of oxide powder samples according to the types of impurities in graphite, and carrying out burning weight loss; respectively adding different amounts of oxide powder samples after burning weightlessness into corresponding tubular furnace graphite boats; adjusting the heating power and the heat preservation time of the tubular furnace, and carrying out a high-temperature purification test in a nitrogen protective atmosphere; after the test under each control condition is finished, taking out each oxide powder sample in each graphite boat, calculating the residual amount, and recording the molten state; a to-be-purified graphite sample is added into a tubular furnace graphite boat, control conditions are set, a high-temperature purification test is carried out, and