Cooperative Preparation of Glass-ceramics by Blast Furnace Slag and Low-carbon Chromium Iron Alloy Slag

This is an article in the field of mineral materials. In order to make high-value utilization and harmless treatment of bulk industrial solid waste, CaO-MgO-Al₂O₃-SiO₂-Cr₂O₃ system glass-ceramics were prepared by melting method with Baotou Steel blast furnace slag, low-carbon chromium iron alloy slag and quartz sand as the raw materials. The optimum ratio of raw materials was explored by means of differential thermal analysis (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that when the mass ratio of blast furnace slag, low-carbon chromium iron alloy slag and quartz sand was 60∶40∶31, the crystalline phases of glass-ceramics were diopside and omphacite. At this time, the performance of glass-ceramics was the best, the flexural strength reached 126.25 MPa, the crystallinity reached 89.19%, and the microstructure was ideal. The glass-ceramics prepared under the optimal raw material ratio met the requirements for national class A decoration materials, i.e. IRa≤1.0 and Iγ≤1.3, and the leaching concentration of heavy metal chromium in the glass-ceramics met the national standard, indicating that it is feasible to prepare glass-ceramics with blast furnace slag and low-carbon chromium iron alloy slag.