Method for purifying quartz sands by microwave-vacuum combined roasting

The invention relates to a method for purifying quartz sands through microwave-vacuum combined roasting, and belongs to the technical field of high-purity quartz sand preparation. The method comprisesthe following steps: crushing, cleaning, screening and grading natural quartz raw ores to obtain quartz particles; roasting the quartz particles, adding the roasted quartz particles into a quenchingsolution, and carrying out rapid quenching treatment to obtain quartz particles; carrying out pressure acid leaching treatment on the quartz particles to obtain an acid leaching solution and acid leaching residues; carrying out microwave-vacuum combined roasting on the acid leaching residues to obtain quartz sands; carrying out ultrasonic alkaline leaching treatment on the quartz sands, carrying out solid-liquid separation to obtain an alkaline leaching liquid and alkaline leaching residues, and carrying out ultrasonic cleaning and drying on the alkaline leaching residues to obtain the high-purity quartz sands. Accordi