Preparation method of modified dolomite-containing flotation tailings and application of modified dolomite-containing flotation tailings as rubber filler

The invention discloses a preparation method of modified dolomite-containing flotation tailings, which comprises the following steps: placing the dolomite-containing flotation tailings in a wet stirring mill, and carrying out suction filtration, drying and crushing on the ground slurry to obtain dolomite-containing flotation tailings ultrafine powder; and adding the powder into a high-speed stirring modification machine equipped with a heating timing device to obtain a functional powder material with a hydrophobic surface and narrower particle size distribution. The invention also discloses an application of the modified dolomite-containing tailings as a rubber filler. The application comprises the step of filling the modified dolomite-containing tailings into chloroprene rubber. The tensile strength of the modified chloroprene rubber is 13.6 MPa; the tensile elongation is 424%; the tensile permanent deformation is 6%; the hardness is 84; and the product can be damaged at a low temperature (-55 DEG C). Equipm