An environmental procedure to extract titanium components and metallic iron from Ti-bearing blast furnace slag

Abstract

An environmental procedure to extract titanium components and metallic iron from Ti-bearing blast furnace slag is accomplished via three steps, which are high-temperature modification, gravity separation and hydrometallurgy method. The behaviors of metallic iron during the high-temperature modification process are studied. The feasibility of separating rutile from the matrix phase are investigated; based on the feasibility analysis results, the gravity separation experiment is carried out in order to improve the TiO 2 content in the slag. The leaching behaviors and kinetics of non-titanium components in the concentrate of gravity separation are investigated. The activation energy of the leaching process is 62.868 kJ/mol, and circulatory leaching and preparation of synthetic rutile experiments are implemented. Finally, an environmental technological route is proposed for comprehensive utilization of Ti-bearing blast furnace slag.

Thermodynamics analysis and experiments on Ti-bearing blast furnace slag leaching enhanced by sulfuric acid roasting

“…1 The applications of Ti-bearing blast furnace slag mainly include producing cement, concrete, non-red and non-steamed bricks, functional materials, and glass-ceramics, 2,3 and also the selective extraction of valuable components such as titanium and magnesium. 4 The latter process can be mainly divided into two categories: pyrometallurgy and hydrometallurgy. 5 Besides pyrometallurgy and hydrometallurgy, there are many reports on the extraction of metals from Ti-bearing blast furnace slag with an electrochemical method, such as molten slag electrolysis, or deoxidation of a solid slag cathode.…”

Recovery of Residual Carbon from Ti-Extraction Blast Furnace Slag by Flotation with Simultaneous Dechlorination

“…The total accumulation of TBBFS has already exceeded 60 million tons [1]. To achieve high-efficiency recovery of titanium, researchers have tried various treatment techniques, such as chemical leaching, selective crystallization, and gravity separation [2][3][4][5]. Among them, "High-temperature carbonation and low-temperature chlorination" is considered the most large-scale process for extracting titanium from TBBFS [6,7].…”

Phase equilibria of the CaO–SiO2–TiO2–Al2O3–MgO system in air at 1250–1400 °C

“…Titania-bearing slag is a typical industrial byproduct of the blast furnace smelting of vanadium and titanium magnetites [1], where the TiO 2 content is approximately 22-25 wt% [2][3][4] and indicates a good source of titania. With a greater demand for a circular economy, various techniques, such as selective crystallization of TiO 2 -rich crystals followed by phase separation (SCPS), hydrometallurgical acid leaching, and the melting reduction method [5][6][7][8][9][10][11][12], have been developed so far for effective recovery of the titania values from titania-bearing slags.…”