A novel route to comprehensive utilization of valuable elements such as Ti, Al, Si and Mg in Ti-bearing electric arc furnace molten slag (Ti-bearing EAF slag) was proposed. The route can be expressed as a three-step process including alkali fusion, water leaching and acidolysis. Following these processes under the optimum conditions, the recovery ratios of TiO2, Al2O3, SiO2 and MgO were about 97.5, 93.5, 27.9 and 53.5%, respectively. Meanwhile, nanostructured TiO2, NaA zeolite and Mg(OH)2 fire retardant were synthesized simultaneously by using Ti-bearing EAF slag as raw materials. In addition, the photocatalytic activity of prepared nanostructured TiO2 and the adsorption property of obtained NaA zeolite were investigated. The results showed that the photodegradation efficiency of as-prepared TiO2 was 80% for rhodamine B and the adsorption efficiency of NaA zeolite was 61% for Cu2+ under the optimum conditions.
Ti-bearing electric arc furnace molten slag Comprehensive utilization Valuable element TiO2 photocatalyst NaA zeolite Mg(OH)2 fire retardant
This is a preview of subscription content, log in to check access.
This study was supported by the National Natural Science Foundation of China (Nos. 51471122 and 51604202), the China Postdoctoral Science Foundation (No. 2016M592397) and the Science and Technology Project of Guangdong Province (No. 2013B090600025).