The invention relates to a high-pressure roll selective smashing and sorting method for middlings, and belongs to the technical field of
mineral processing. The method comprises the following steps of: (1) smashing raw
coal until the
granularity is less than the upper limit of selected
granularity suitable for a follow-up cleaning unit, desliming, and enabling the deslimed raw
coal to enter resorting equipment to obtain
clean coal I, middlings I and
gangue I; (2) smashing the middlings I until the
granularity is less than the upper limit of smashing granularity suitable for a high-pressure
roller mill, carrying out high-pressure roller milling ultrafine smashing, desliming products subjected to ultrafine smashing, enabling the deslimed products to enter the resorting equipment to obtain
clean coal II, middlings II and
gangue II, wherein the middlings II return to the
high pressure roller mill to be mixed with the middlings I so as to be smashed and sorted; (3) carrying out flotation on the
coal slime after concentration and size mixing so as to obtain flotation
clean coal and flotation tailing. Compared with conventional middlings smashing processes, the method disclosed by the invention is high in product dissociation degree and good in subsequent resorting effect, can be used for improving the clean coal yield, enabling coal resources to be sufficiently and reasonably recycled and utilized, and reducing resource waste.