In the iron ore beneficiation process, the ball mill is a core piece of equipment for ore liberation and fine grinding, and its selection directly impacts subsequent separation efficiency and overall economic benefits. The MQY series overflow ball mill, due to its reliable structure and uniform product particle size, has become a common choice for iron ore processing.

The primary basis for selection is the nature of the raw ore and the processing scale. Factors such as iron ore hardness (e.g., magnetite is harder, hematite is slightly softer), particle size distribution, and designed processing capacity must be considered. For example, an iron ore beneficiation plant processing 3000 tons per day often requires an MQY3200×4500 or larger unit to ensure sufficient grinding volume and residence time. Simultaneously, the feed particle size (usually ≤25mm) and target product fineness (e.g., -200 mesh accounting for over 85%) directly influence the length-to-diameter ratio and rotational speed of the mill.

Secondly, the ball mill must be matched to the process flow. If a staged grinding-magnetic separation process is used, a short-barrel type can be selected for the coarse grinding stage to increase throughput, while a long-barrel type is preferred for the regrinding stage to enhance grinding efficiency. As an overflow type, the MQY is suitable for closed-circuit systems requiring fine classification and is often used in conjunction with hydrocyclones. In this case, the impact of the circulating load on motor power needs to be verified.