In recent years, Chinese infrastructure including high-speed rails, road and building is developing fast. Machine-made sand is used widely. The ultrafine vertical mill production lines, composed of crushers, sand-making machines and conveyors, are seen everywhere. 

Considering environment and technologies, two sand-making methods-by dry-process and wet-process, are gradually mixed with each other. Chinese machine-made sand production is entering leaping development stage. As the domestic famous enterprise configuring aggregate production line, GK becomes the focus of this field.

Ultrafine vertical mill production lines are widely used in aggregate plants, mines, metallurgy, building materials, roads, railways, water conservancy, chemical engineering. The capacity varies from 50 t/h to 1000 t/h with granularity arranged and classified in terms of different demands.