In the field of mineral processing and industrial grinding, MQG and MQY ball mills are two common types of equipment. Their core difference lies in the discharge method, which in turn affects their applicable scenarios and operating characteristics.

MQG represents a grate-type ball mill, which has a grate plate at the end of the cylinder.  This forced discharge mechanism quickly removes the ground material. This design effectively shortens the material's residence time in the cylinder, reducing over-grinding and making it suitable for coarse grinding or primary grinding operations. Typical MQG models have a strong processing capacity and high hourly output.  At the same specifications, their purchase cost is usually slightly higher than overflow-type mills, ranging from approximately $80,000 to $250,000, depending on size and configuration.

MQY refers to an overflow-type ball mill, which relies on the natural overflow of the slurry to discharge the material. The material stays in the cylinder longer, resulting in more thorough grinding and finer, more uniform particle size. It is often used in secondary fine grinding or processes requiring high product fineness. Due to its relatively simple structure, without complex components like grate plates, the manufacturing cost of MQY is slightly lower, and the market price is generally between $70,000 and $220,000.

From an operational perspective, MQG is more suitable for high-throughput, primary crushing stages where over-grinding needs to be prevented; MQY performs better in fine grinding and closed-circuit systems. Additionally, MQY generally has lower maintenance costs, but energy consumption may be slightly higher due to longer operating times.

In summary, neither type is inherently superior; the key is matching the process requirements: if efficiency and output are the priority, MQG is recommended; if fineness and uniformity are crucial, then MQY is more suitable. Proper selection can significantly improve the economics and stability of the overall grinding system.