1、 1 OK Vertical roller mill Main features: OK vertical roller mills use 30%-50% less energy than ball mill systems. Simple layout and fewer machines in the mill circuit high run-factor and low maintenance costs. Excellent drying capability when grinding blast furnace slag or blended cements with wet
2、components . Roller and table profile improve operating stability and reliability. Consistent cement quality with easy to adjust quality parameter Special design features for iron removal during slag grinding minimize wear Optimal wear-protection all internal surfaces Space-saving design reduces civ
3、il construction costs Flexibility to operate with two or four rollers guarantees long term availability. Application advantages Proven commercially, the OK mill is the premier roller mill for finish grinding of portland cement, slag and blended cemtrents. With a 30%-45% reduction in the energy requi
4、rements for cement 2 grinding and 40%-50% for slag as com-pared with traditional ball mill operations, the OK mill can contribute significantly to your profitability and competitiveness. The design combines the drying, grinding and separation processes into just one unit, thus simplifying the plant
5、lay -out. A low noise level makes outdoor installation feasible, substantially reducing civil construction costs and improving the working environment. Because of its highly effective drying performance, the OKmill is a natural choice for grinding blended cements with one or more wet components Desi
6、gn advantages The OK mill uses a hydro-pneumatic system to press its grinding rollers against the material bed on the roatting grinding table. The grooved roller profile has two grinding zones, an inner and outer. This creates a high and concentrated grinding pressure on the outer path, allowinair t
7、o escape into the grooved centre. The inner path serves to prepare the grinding bed, by compressing the feedmaterial as it moves under the rollers nto the high pressure grinding zone. Segmented roller wear parts are made of the hardest possib le material without risk of cracking and are very well su
8、ited or hard 3 facing. Re-positioning of rollers is possible for evening out wear. These features ensure maximum longevity. Operating advantages The rollers are in a lifted position when the mill is started, ensuring trouble-free start-up . This eliminates the need for an auxiliary drive. A control
9、system monitors the machinery and facilitates operation. Mill arrangement This schematic illustrates a typical grinding installation. The arrangement is very simple and the operation is correspondingly flexible and reliable. To maintain the appropriate temperature in the mill circuit. For example to
10、 ensure adequate dehydration of the gypsum when grinding cement-the layout is prepared with provisions for recirculation of hot exit gas to the mill inlet. In case the mill feed is wet slag or includes a significant portion of wet additives, addition heat must be provided, for inentance form a heat
11、generator. Otherwise, if the mill feed is very hot, the mill exit temperature controls a damper for cold air intake. Nozzle ring bypass system For slag grinding, a specially designed nozzle ring bypass allow the iron particles to segregate through nozzles without airflow and subsequently be removed by a magnetic separator to minimise
