Preparation of glass-ceramics from chromite-containing tailings solidified with Red Mud

In order to solve the problem of chrome slag returning to yellow and Red Mud accumulating in large amounts, this study proposes to use Red Mud and chromite ore process residue instead of clay to make glass-ceramics, and seal chromium, so as to achieve the purpose of waste control by waste and high-valued of final product. The Red Mud (RM), Chromite ore process residue (COPR) and silicon dioxide were homogenized in ethanol and fired at 1200 ℃ for 2 h. The results of XRD and SEM-EDS show that part of chromium enters the lattice, and the rest is wrapped in silicate glass . The leaching toxicity test data of solidified samples showed that the leaching concentrations of hexavalent chromium and total chromium were below the detection limit. In the process of sintering, solidification and preparation of glass-ceramics, Red Mud is not only used as one of the raw materials of glass-ceramics, but also plays the role of fluxing agent and nucleating agent, which greatly reduces comprehensive energy consumption and the production cost of glass-ceramics. This study provides a new way to solve the environmental problems caused by RM and COPR.