After 25 years of mainly producing slag cement, the vertical roller mill MPS 3750 C near Hannover and supplied by Gebr. Pfeiffer AG was equipped with a modern outer material recirculation circuit and a new nozzle ring. During the acceptance test in 2006 with CEM III A 42.5 containing 40% slag, the production rate was increased by 30% at a fineness of about 5500cm²/g (Blaine). The electric energy consumption of the mill, separator and fan was reduced by 10% at the same time.
Gebr. Pfeiffer AG, a medium-sized family business, has been a supplier to the cement, lime and gypsum industries for over 140 years. The company's product range comprises machines and equipment for the grinding, classification and drying of diverse materials and for slaking quicklime and calcining gypsum, which are sold worldwide.
The company, headquartered in Kaiserslautern, employs 280 staff and maintains manufacturing facilities as well as its own foundry. Gebr. Pfeiffer AG has an annual turnover of around Euro100m. With over 2000 MPS vertical roller mills in use around the world today for grinding cement raw material, coal, clinker, granulated blast furnace slag (GBFS), pozzolana, limestone, clay, gypsum and various other materials, the MPS technology represents the company's major source of revenue.