The invention discloses a flotation-free dressing
recovery process for mixed
iron ore, and relates to the technical field of ore dressing. Mixed
iron ore high-pressure roller milling-wet pre-selected concentrate enters a follow-up
grinding and selecting first-section
hydrocyclone to be classified, sand settled by the
hydrocyclone enters a first-section
ball mill to be ground, and ball-milling discharged ore returns to the first-section
hydrocyclone to be classified; overflow of the first-section hydrocyclone enters a spiral chute for grading to obtain
iron ore concentrate;
tailings in the spiral chute are subjected to weak
magnetic separation and strong
magnetic separation tailings discarding, strong magnetic concentrate passes through the spiral chute to obtain iron
ore concentrate, the
tailings in the spiral chute and the weak magnetic concentrate are combined and enter a second-stage hydrocyclone to be classified, classified settled sand enters a second-stage
ball mill to be ground, second-stage
ball mill discharged ore passes through the spiral chute to obtain an iron
ore concentrate product III, and second-stage ground ore overflow is subjected to weak
magnetic separation and strong magnetic separation tailings discarding; and the weak magnetic concentrate and the strong magnetic concentrate are combined and classified through screening, the undersize product is an iron
ore concentrate product IV, and the screened product returns to the second-stage
cyclone to be classified, so that a closed cycle is formed. The method has the advantages of low production cost, high
recovery rate, high concentrate
dewatering and filtering performance, economical,
environmental protection and the like.