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Using the waste clay brick(WCB)as siliceous materials to produce cement clinker.The heating temperature of raw materials ranged from 1250℃,1300℃,1350℃,1400℃ to 1450℃,and the sintered time was kept in 30min.The final sintering temperature was determined on the percentage of free-lime(f-CaO),petrography and minerals components of clinker(petrographic analysis and XRD).