China Nonferrous Metallurgy

The accumulation of red mud occupies a large amount of land resources, and there are environmental and safety risks. At present, recovering valuable elements from red mud is one of the effective ways to consume red mud. In this paper, high-iron red mud was treated by melting reduction method. After recovering iron, the phase analysis and micro-morphology analysis slag were carried out on the tailings in slow cooling process. The phase change of the iron removal tailings during the slow cooling process was studied. It provides a theoretical basis for preparation of cementation withiron removal tailing from high iron red mud smelting reductions. The results show that heat preservation at 1000℃ in the slow cooling process,the iron removal tailings,which is formed in the reduction condition of alkalinity 0.8, carbon ratio 1.1 and CaF₂ addition 10%, can better form the phase required for the preparation of cement.