Clay or industrial wastes containing trace rare earth（RE） oxides as one of the components are used to burn cement clinker.When the total amount of RE oxides reaches 0.2×10-4-2.0×10-4（wt）, it has positive effect on the burnability of raw meals, and the Alite content in clinker increases.However,with the addition of lanthanide, the formation process of clinker and the distribution of lanthanide in clinker are different from those of yt trium.If the burning temperature is 1450 C, yttrium shows negative effect on the formation of clinker. There fore to improve the quality of cement clinker, the raw meals in which yttrium content is lower and lanthanide content is higher is preferable; to reduce the consumption of coal, the raw meals that yttrium content is higher is suitable.Using raw meals containing trace RE oxides can reduce the cost of fluorite and protect environment.
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