Rema Ball Mills0 pages

Contact us info@britis hrema.com 01246 296520 Rema Bail Mills Introduction: Bail Mills, and other forms of tumbling mills such as tube mills, rod mills and batch mills form a significant type of equipment used for the size reduction of a wide variety of materials such as minerals, ores, coal, carbon products and general chemicals. Generally used in high volume applications, there are a many types, sizes and system configurations and British Rema has long experience in the selection, design and sizing of such systems. Operating Principles: Ball mills operate by introducing the material to be milled into a rotating vessel which contains a grinding medium (eg high-density balls or rods) and the material is ground (wet or dry) by attrition through the tumbling action of the mill. Slow rotational speeds combined with simple and robust construction make them ideal for grinding hard and abrasive materials where continuity of service, low maintenance and minimum downtime are a necessity. Ball mills can be designed to operate continuously (fed at one end of the system and discharged at the other), or on a batch basis for smaller, or intermittent, volumes. System configuration: Ball mills can be operated either on a stand-alone basis ("open-circuit grinding") or in conjunction with a classifier which returns oversize product to the mill for further grinding ("closed-circuit grinding"). With open-circuit systems, finished product is obtained from a single pass through the mill which typically produces a relatively wide particle size distribution. Special care has to be taken selecting the geometry of the mill (length, diameter, rotational speed etc) to ensure that the desired particle size is obtained. If operated in conjunction with the correct air-classifier (closed-circuit), the grinding system is capable of achieving a much narrower particle size distribution, with an accurate control of top-size. A closed system minimizes over-grinding, resulting in improved efficiency, and allows a smaller mill to be used for any given capacity. Air swept milling: Applicable to dry closed-circuit milling only, a further variation can be the introduction of an air flow through the mill ("air-swept milling"). This provides a form of elementary pre-classification and typically produces narrower size distributions but less fine particles than its non air-swept equivalent. Typically suitable for end product falling in the range of 50 to 200 microns, this system can also be used to achieve a limited drying capability, handling product of up to 8% moisture content. After Sales Service, Spares and On-Site Services: British Rema can service, repair or replace the mechanical and wear parts for a wide range of ball mills. Ball Mill parts include diaphragms, grates and screens; lifters, liner and grinding plates; lining refurbishments; mill shells; trunnion bearings; drive and gear components; feeders, discharge hoppers and ductwork Supply of consumables: grinding media of all relevant sizes and materials Site surveys: mechanical condition assessment; optimization of speed of rotation; shell re-alignment, internal plate mapping. Troubleshooting: temperature and vibration checks; air supply checks; monitoring the efficiency of closed-circuit systems; energy consumption monitoring Contact our Spares Division:: + 44 (0) 1246 296520 British Rema Process Equipment Ltd Unit 4, Traso Business Park, Callywhite Lane, Dronfield S18 2XR, United Kingdom tel: + 44 (0)1246 296520 fax: + 44 (0)1246 292400 email:sales@britishrema.com web: www.britishrema.com Sales Director: David Bugler Technical Sales Manager: Peter Broughton Registered address: Masters House, 107 Hammersmith Road, London W14 0QH Company Registration No: 5556424