关键词: 含钛高炉渣, 湿法提钛, 硝酸浸出, 碱浸, 富钛料

Abstract: In order to realize the efficient recovery and utilization of titanium resources in a titanium�bearing blast furnace slag，nitric acid pressure leaching process is adopted. Under the conditions of nitric acid dosage of 2.3 M（M is the mass of blast furnace slag，nitric acid concentration of 60%），leaching liq‐ uid-solid ratio of 3∶1，leaching temperature of 150 ℃ and leaching time of 1.5 h，the leaching rates of cal‐ cium，magnesium and aluminum in blast furnace slag are 98.10%，97.97% and 95.58%，respectively， and the leaching slag with TiO2 and SiO2 contents of 42.01% and 44.81% are obtained.The leaching resi‐ due is subjected to atmospheric alkali leaching process. Under the optimum reaction conditions of sodium hydroxide dosage 0.4 N（N is the mass of pressurized acid leaching residue），leaching temperature 40 ℃， leaching time 1.5 h，and leaching liquid-solid ratio 3∶1，the leaching rate of silicon is 95.20%，and the loss rate of titanium is 0.56%.The results show that the low calcium and magnesium titanium-rich material is prepared by nitric acid pressure leaching-atmospheric alkali leaching desilication process. Finally，the titanium-rich material with TiO2 content of 85.50%，CaO content of 0.08%，MgO content of 0.11% and SiO2 content of 3.12% is obtained. The product quality meets the relevant industry standards，which pro‐ vides a new path for the resource utilization of titanium-containing blast furnace slag.

Key words: titanium-bearing blast furnace slag, wet titanium extraction, nitric acid leaching, alkali leaching, titanium-rich material