The invention discloses a preparation method of a
graphite negative
electrode material. The preparation method comprises the following steps: 1,
raw material extraction; 2, grading; 3, purification; 4,
drying and screening; 5, fusion
coating; 6, light crushing and packaging. Light and heavy minerals are separated through the spiral chute, and ore pulp is fed into the spiral groove, and then the ore grains do rotary motion downwards in the ore pulp along the groove; under the action of gravity, a
friction force and a
water flow impact force, the separation is performed according to the shape and
specific gravity of ore grains; after separation,
tailings, namely light minerals, are coarsely crushed through a jaw
crusher, then coarsely crushed ore particles are finely crushed through a hammercrusher, the finely crushed ore particles are subjected to ball milling through a
ball mill, then the ore particles are subjected to flotation treatment through a flotation
machine, and the ore particles subjected to flotation are subjected to
dehydration and
filtration treatment. The method is good in
graphite ore
beneficiation effect, good in purification effect and high in carbon purity, and the obtained product is small in particle size, good in
cycling stability and high in capacity
retention ratio.