Regular Article

A novel method for preparing Ti₅Si₃ from Ti-bearing blast furnace slag

¹ Central Research Institute of Building and Construction, MCC Group Co Ltd., Environment Convention and Protection, MCC Group Co Ltd., State Key Laboratory of Iron & Steel industry Environmental Protection, Beijing 100088, PR China
² State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, PR China

^* e-mail: ghzhang_ustb@163.com

Received: 5 November 2019
Accepted: 1 October 2020

Abstract

Effective recovery of titanium resources from titanium-bearing blast furnace slag had always been a difficult problem. In the present study, Ti₅Si₃ was synthesized via silicothermic reduction of titanium-bearing blast furnace slag. The effects of reduction temperature and reaction time on the formation of Ti₅Si₃ were studied by X-ray diffraction and scanning electron microscope. The results indicated that Ti₅Si₃ was the only silicide in the finally obtained products. Ti₅Si₃ will gradually sinter to form a porous skeleton, and a small amount of slag will be trapped in the porous skeleton of Ti₅Si₃. It provided a feasible route for the treatment of titanium-bearing blast furnace slag and the recovery of titanium resources. It was also found that the longer the reaction time and the higher the reaction temperature (1823 K), the less the slag trapped in the alloy will be.