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-preparat...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 titaniumrich material could be obtained from the leaching residue by desiliconization.展开更多
The leaching kinetics of magnesium slag in ammonium chloride solutions was investigated.The effects of initial ammonium chloride concentration,liquid-solid ratio and reaction temperature on the leaching rate of calciu...The leaching kinetics of magnesium slag in ammonium chloride solutions was investigated.The effects of initial ammonium chloride concentration,liquid-solid ratio and reaction temperature on the leaching rate of calcium were determined.The results showed that the leaching rate increased with the increase in initial ammonium chloride concentration,reaction temperature and liquid-solid ratio.It was determined that the leaching rate fit the Avrami equation,and the leaching process was controlled by diffusion.The activation energy was 13.22 kJ/mol.展开更多
基金Funded by the National Natural Science Foundation of China Youth Fund(No.52204419)the Liaoning Provincial Natural Science Foundation(No.2022-BS-076)the Guangxi Science and Technology Major Project(No.2021AA12013)。
文摘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 titaniumrich material could be obtained from the leaching residue by desiliconization.
基金Funded by the Iron and Steel Joint Fund of National Natural Science Foundation of China (No.U1760120)the National Key R&D Program of China (Nos.2017yfc0210403-04, 2017YFC0210404)。
文摘The leaching kinetics of magnesium slag in ammonium chloride solutions was investigated.The effects of initial ammonium chloride concentration,liquid-solid ratio and reaction temperature on the leaching rate of calcium were determined.The results showed that the leaching rate increased with the increase in initial ammonium chloride concentration,reaction temperature and liquid-solid ratio.It was determined that the leaching rate fit the Avrami equation,and the leaching process was controlled by diffusion.The activation energy was 13.22 kJ/mol.
