Steel Slag Grinding Plant; GGBS Production Line; 300,000 t/a GGBFS Plant; 450,000 t/a GGBFS Plant; 600,000 t/a GGBFS Plant; 600,000 t/a GGBFS Plant for Xinji Gangxin Cement Co., Ltd. Great Wall Machinery GGBS Plant with 600,000 t/a Capacity; 900,000 t/a GGBS Plant of Hongyan Building Materials Co., Ltd. 1.5 Million t/a GGBS Plant of …