Effects of mixing technique, molar ratio, and filtration methods on the production of titanium power from secondary titanium slag though magnesiothermic reduction

Abstract

Magnesiothermic reduction has been considered as effective pathway to fabricate titanium powder from secondary titanium slag. The feed material (Secondary titanium slag from Binh Dinh Mineral Joint Stock Company), reductant (Mg), and MgCl₂.6H₂O were mixed and reduced under in an argon atmosphere at 900 ^oC in 4 h. To obtain good yield and quality of the titanium product, many factors such as: mixing method of raw materials, the molar ratio of Mg/TiO₂, and filtering and separating the products (water washing and acid washing) should be optimized. In this study, these influencing factors were extensively investigated and optimized. The prepared titanium powder was characterized using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), and scanning electron microscopy (SEM). The research results showed that with the molar ratio of Mg/TiO₂ of 2.6, interleaved or even disposition of raw materials were optimal conditions to convert secondary titanium slag to titanium powder. The titanium product after pyrolysis washed and filtered with water followed by the acid washing, was a high-purity porous with a titanium content of up to 94.75%.