As we all know, industrial waste slag, as a kind of cement mixture, plays the following main roles in cement plant:

1. The activation effect: slag contains active SiO2 and Al2O3, which can react with Ca(OH)2 produced during hydration of cement, ettringite, and the excess water to generate new C-S-H gel and calcium sulphoaluminate which can improve strength of cement;

2. Filler function: it is combined with cement hydration products and play the role as the nucleus skeleton;

3. Close accumulation.

(1) The closed circuit grinding process system consisting of ultrafine grinding mill like: vertical slag mill and superfine powder separator can grind slag and fly ash to the specific surface area of ​​700 m2/kg or more, D97 < 30 m, D50 < 10 m, and the output Is high and the energy consumption is low.

(2) The strength and activity index of ground slag and fly ash increased remarkably. The activity index of slag is about 120%, activity index of fly ash is about 100%, and the content of admixture increases by more than 30%. Per Ton of cement can save 30kg of coal, reduce 300kg of CO2 emission, reduce production costs more than 30 yuan.

(3) Adopt separate-grinding technology to produce cement according to market demand, replacing varieties is convenient and flexible.

(4) It is beneficial to develop special cement and diversified varieties, which can reduce the risk of enterprise operation and have strong market adaptability.

(5) Grinding and blending industrial waste slag is one of the effective ways to energy saving, emission reduction, cost reduction and efficiency improvement in cement industry.