Demands for increased grinding production, lowergrade ore and limited capital have resulted in ever larger grinding mills, some as large as 36ft (11 m) in diameter and 12,000 hp (8,950 kw). The result is often fewer machines per plant, with a greater dependence on each machine.
The Outotec stirred mills are suitable for a large range of product sizes. The standardized range includes chamber units of up to 50,000 liters and the world's largest industry units with up to 6,500 kW of installed power. Floor space use is optimized, which reduces investment costs, and installation is easy.