Extraction of Valuable Metals from Titanium-bearing Blast Furnace Slag by Acid Leaching

Abstract

To realize the resource utilization of the valuable metals in the titanium-containing blast furnace slag, the process route of “hydrochloric acid leaching-electrolysis-carbonization and carbon dioxide capture-preparation of calcium carbonate” was proposed. In this study, the influences of process conditions on the leaching rates of calcium, magnesium, aluminum, and iron and the phases of the leaching residue were investigated for the leaching process. The experimental results show that the HCl solution could selectively leach the elements from the titanium-containing blast furnace slag. The better leaching conditions are the HCl solution concentration of 4 mol/L, the leaching time of 30 min, the ratio of liquid volume to solid gas of 10 mL/g, and the stirring paddle speed of 300 r/min. Under the conditions, the leaching rates of calcium, magnesium, aluminum, and iron can reach 85.87%, 73.41%, 81.35%, and 59.08%, and the leaching rate of titanium is 10.71%. The iron and the aluminum are removed from the leachate to obtain iron-aluminum water purification agents, and the magnesium is removed from the leachate to obtain magnesium hydroxide. The leaching residue phase is dominated by perovskite, followed by magnesium silicate and tricalcium aluminate, and the titanium-rich material could be obtained from the leaching residue by desiliconization.

Keywords

titanium-containing blast furnace slag / acid leaching / valuable metals / comprehensive utilization

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