Grading and quality-dividing full-component utilization method for coal gangue

The invention provides a coal gangue grading and quality-dividing all-component utilization method, and relates to the technical field of solid waste resource utilization. According to the method, different crushing and screening processes are adopted respectively based on the difference between the component composition and the process property of the coal gangue, particularly based on the difference of the mass content ratio of SiO2/Al2O3 in the coal gangue, and coal, gangue (soil) and stone in the coal gangue are separated and sorted through the multi-stage crushing, precise grading and sorting technologies, so that gravel, machine-made sand, soil and coal with different size fractions are obtained; then fuel utilization, regenerated soil utilization, fertilizer preparation and CO2 solid absorption material preparation are respectively carried out according to respective composition and process property differences, so that graded and quality-divided full-component utilization of the coal gangue is realize