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This article offers the complaints of a seminar equipped via the CEC, Directorate-General for power and CIMPOR Cimentos de Portugal E.P. with the co-operation of Cembureau ecu Cement organization, held in Oporto, Portugal, 6-7 November 1989.

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The dashed lines relate to the secondary grinding in a ball mill of grinding feed from highpressure grinding rolls operated in closed-circuit. The figure indicates that to grind cement to a fineness of some 2,000 cm2/g in high-pressure grinding rolls an energy demand of only some 9 kWh/t of cement would be needed. A secondary grinding by about 1,500 cm2/g requires additionally 18 kWh/t of cement. The total energy consumption for a grinding to 3,500 cm2/g would thus amount to about 27 kWh/t of cement.

2. WASTE GAS HEAT UTILIZATION POSSIBILITIES Different amounts of exit gas or waste heat may arise from modern cement kilns equipped with cyclone preheaters. This will depend on the methods and machinery employed. Fig. 1 schematically indicates the principal points of gas discharge from the rotary kiln process with precalcination. The waste gases differ with regard to quantity, composition, temperature, pressure and dust content. It is presupposed that these gases cannot be directly utilized in the burning process.

3: Energy input of various mills as a function of specific surface area of the portland cements produced. roller mills may achieve up to 50 % of energy savings for the mill drying of raw material. For the milling of cement the situation is similar, although here the energy savings are reduced with increasing wear and may even turn into an excess energy consumption. In addition, special measures are needed to safeguard the utility properties of the cement, which may also diminish the energy savings.

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