Preparation method of coal rock polished section

Abstract

The invention discloses a preparation method of a coal rock polished section, which comprises the following steps: before mixing a coal sample which is crushed to a qualified particle size with an adhesive, carrying out pre-wetting treatment on the coal sample by using water or a dextrin solution, stirring to fully wet coal particles, carrying out suction filtration, drying in the shade, mixing the coal particles with the adhesive, putting the mixture into a mold, drying under a room temperature condition, and carrying out sintering to obtain the coal rock polished section. And grinding and polishing to prepare the coal rock polished section. Compared with a national standard method, the polished section prepared after the coal particles are pretreated through the pre-wetting method is more stable in quality, potholes are not formed in the polished surface, flatness is better, surface roughness is smaller, maceral boundaries are clearer, the method is high in operability, and coal rock properties cannot be affected. Water or a dextrin solution is used for pretreatment so as to eliminate air films on the surfaces of the coal particles, enhance the wettability of the surfaces of the coal particles and fundamentally avoid bubbles and pits in the polished section.