Influencing factors of high temperature purification of graphite

①The impurity content of graphite raw materials has the greatest impact on the purification effect of high temperature method. The impurity content of the raw materials is different, the ash content of the obtained product is different, and the graphite with high carbon content has better purification effect. The high temperature method often uses flotation or alkali-acid method. After purification, graphite with a carbon content of 99% or more is used as the raw material;

② The carbon content of the graphite crucible is also an important factor affecting the purification effect. The ash content of the crucible is lower than the graphite ash content, which helps the ash in the graphite escape;

③Using high current, the graphite heats up quickly, which is conducive to the purification of graphite. It is best to use the raw materials of high-power electrodes and treat them at a high temperature of 2800℃;

④The graphite particle size also has a certain influence on the purification effect.