Carbothermic Reduction of Titanium-Bearing Blast Furnace Slag

Abstract

The carbothermic reduction experiments were carried out for titanium-bearing blast furnace slag in Panzhihua Iron and Steel Company in argon atmosphere at high temperatures. The effects of reduction temperature, isothermal treatment time and carbon content on the formation of TiC were studied by X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD pattern results showed that MgAl 2 O 4 phase disappeared and the main phase of the reduced sample was TiC when the reduction temperature was higher than 1,773 K. The SEM pictures showed that the reduction rate of the titanium-bearing blast furnace slag could be increased by enhancing the temperature and the C content (carbon ratio 1.0). Furthermore, it was also found that TiC had the tendency of concentrating around the iron. The effects of additives such as Fe and CaCl 2 on the formation of TiC were also studied in the present study.

Experimental Study on the Phase Relations of the SiO2-MgO-TiO2 System in Air at 1500°C

“…With the steady growth in the generation of blast furnace slags from vanadium-titanium magnetite ores, the recovery of titania from industrial titaniabearing slags containing 22-25 wt.% TiO 2 1-3 is attracting increasing attention. [3][4][5][6][7][8][9][10][11][12][13][14][15] Over the past decades, both hydrometallurgical and pyrometallurgical methods [15][16][17][18][19][20][21][22][23][24] for processing titania-bearing slags have been applied and investigated intensively. Recently, a selective crystallization method and separation of a titania-enriched phase has also been proposed [25][26][27] to collect titania into a certain phase.…”

Effect of B₂O₃ on Structure of CaO–Al₂O₃–SiO₂–TiO₂–B₂O₃ Glassy Systems

“…Feifei LAI, 1,2) Wen YAO 1,2) and Jiangling LI 1,2) Titanium-bearing blast furnace slag is an important metallurgical waste, but presently, it is difficult for it to be effectively utilized. B 2 O 3 is an important modifier to greatly promote the mass diffusion of crystallization of Ti-enriched phases in molten slags.…”

“…Vanadium-titanium magnetite is an important ore resource, of which there are abundant reserves in China, especially in the Panxi area, which account for more than 90% of China's reserves. 1,2) During the ironmaking process, vanadium-titanium magnetite is commonly used as a raw material for extracting iron. After smelting in a blast furnace, most of the titanium is transferred to slag, referred to as Ti-bearing blast furnace slag.…”

An approach to prepare high-purity TiSi2 for clean utilization of Ti-bearing blast furnace slag

“…Besides hydrometallurgical and electrolysis approaches, the preparation of Ti alloys by reducing Ti-bearing blast furnace slag (reducing TiO 2 in the slag) using carbon or silicon reductants has also been investigated. Zhen et al 16 prepared TiC by the carbothermic reduction of Ti-bearing blast furnace slag at high temperature (≥1773 K). The obtained TiC was chlorinated to TiCl 4 at a low temperature (873 K), 17 and the chlorinated waste slag was used for cement production after treatment.…”