Eriez said its Trunnion Magnets offer maximum performance to help extend pump and hydrocyclone life and increase milling throughput by as much as 5%. They effectively remove more than 90% of worn and broken ball grinding media from ball/SAG mill discharge. Positioned at the discharge of the mill, the Trunnion Magnet consists of an arc of permanent magnets surrounding almost half of a blind trunnion extension. As the trunnion rotates, the powerful magnetic circuit attracts and holds steel grinding balls to the inner surface of the trunnion. The steel balls are carried to the top of the trunnion where the magnetic arc terminates, releasing the balls, which subsequently fall into a hopper and chute. The units are easy to install, operate and maintain, according to the company, and feature a simple design and rugged construction to withstand harsh applications. With permanent magnet elements that require no power, operating expenses are also reduced.