The high-concentration refiner, referred to as the high-concentration refiner, is a mandatory feed for high-concentration pulp mills. Suitable for chemical pulp, semi-chemical mechanical pulp, polished high-yield pulp and fiberboard materials. The application range of the slurry is wide, the two kinds of bacteria are complex, the slurry materials are very different, the remaining debris remaining after wood processing, shavings, sawdust, pulp residue and cold-impregnated amaranth chips, straw, and the rotation speed is higher. Appropriate use of high quality fiber. Its advantages are: high consistency refining, reducing fiber cutting, wire brush effect, high grinding efficiency, low unit energy consumption.