Special polishing agent for coal rock and preparation method thereof

The invention discloses a special polishing agent for coal rock and a preparation method of the special polishing agent. The special polishing agent for the coal rock is prepared from the following components in parts by weight: 8-10 parts of magnetized modified diamond micro powder, 20-40 parts of a suspending agent, 1-2 parts of a dispersing agent, 0.1-1 part of a suspending aid, 0.1-1.5 parts of a pH regulator, 0.1-0.5 part of a preservative and 20-40 parts of deionized water. The magnetized modified diamond micro-powder is prepared by the following steps: mixing diamond micro-powder and iron micro-powder in a vacuum environment, introducing oxygen, heating at a high temperature, depositing and growing a Fe3O4 wrapping layer on the surface of the diamond micro-powder, cooling and sieving to obtain the required magnetized modified diamond micro-powder. The formula design is scientific and reasonable, traditional diamond micro-powder is replaced with the magnetized modified diamond micro-powder, the diamond