Thermodynamic Study on the Direct Reduction of Specularite by Lignite and the Coupling Process for the Preparation of Cementitious Material

To realize the efficient and comprehensive utilization of specularite resources, combined with cement clinker production technology rotary kilns, coupling process direct reduction by lignite preparation cementitious material was proposed, additional aim achieving iron oxide transforming gangue component into material. Thermodynamic software used to calculate product composition when reaction reached equilibrium under set conditions. By analyzing influence ratio C/O, basicity, temperature, other parameters on generation, feasibility judged experimentally verified. The results showed that thermodynamically feasible using highly volatile added calcium oxide. optimal C/O reducing agent 1.2 for complete (Fe2O3, Fe3O4, FeO) without fraction; reduced could stably coexist components, but unreduced FeO would result in a substantial tricalcium silicate generation. Using as agent, hydrogen-rich volatiles coal created good atmosphere, strengthened oxide, provided favorable conditions generation A two-stage heating system must be adopted conducive materials were determined, basicity range regulated 2.4–3.3, reasonable temperature close not higher than 1137 °C, 1450 °C.