Cement and Energy

contract. During 1995, internal tests were carried out by the operating personnel of Nuh Cimento, when all the clinker was weighed in trucks on a weighbridge. The clinker produced had the following parameters: Lime saturation Silica ratio /\l umina ratio 93.00 2.7 1 1.98 The ex haust gas temperature from this plant is low for a lour-stage system and lies between 280 and 290°C. The calcincr temperature is normally set to just below 900° C. Courte.1y : International Cement Review: September / 996 Conclusion An inspection of the system after completion showed that it had been possible to integrate the new and modified components effecti vely into the existing system. The project is also proof of the possibility to achieve, with good planning, a high local work con tent in the fields of manufacture, construction and assembly and thus to keep down investment costs. SLAG PUT THROUGH THE MILL I CR takes another look at the Lafarge-owned grinding plant in southern France where Loesche's energy-efficient vertical roller mill is being used to grind and dry moist blast furnace slag. Following testing, has the equipment lived up to its guarantee? The answer appears to be yes. /\ fter 18 months usc, company engineers have su ffi cient results to compare guaranteed versus achieved operat ing performance under two different tincncss levels 3500 and Showing irs teeth in the slag grinding unit. A welding unit. A welding machine ts usually provided for hare/facing ofgrinding roller ryres and grinding plate segments inside the mill. 4500 blaine. Also, there arc indicat ions that the same mill can be used lor cl inker gri nding as well. The new Loesche mill LM 2+2c/s vertical mill for slag grind ing with master and slave roller has been running at the Lafargc Cimcnts plant sint:c January 1995. Table I shows that a specific power consumption of 24.7 kWh/t at 3500 blai ne has been achieved for the mill and classifier. In comparison with conventional gri nding plants, which arc equipped wi th ball mills. more than 30 per cent energy savmgs can be achieved.