According to the demands of ball mill coal pulverized system, inverse matrix decoupling theory, a traditional decoupling method, is used in the system control, and a PID controller is designed.

The South Korean mill earlier this year agreed to buy as much as 15 percent of the Roy Hill iron ore project in Australia and a 7.8 percent stake in a coal mine in Mozambique.

This paper briefly describes the present situation of sound insulation ways universally adopted in steel ball coal mill and the noise intensity released during operation.