文献类型：期刊文献

英文题名：Selective separation of aluminum, silicon, and titanium from red mud using oxalic acid leaching, iron precipitation and pH adjustments with calcium carbonate

作者：Li, Wanyan Wang, Ning Lu, Fanghai Chai, Hongyun Gu, Hannian

第一作者：Li, Wanyan

通信作者：Gu, HN[1]

机构：[1]Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths Int, Guiyang 550081, Peoples R China;[2]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[3]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[4]SPIC Zunyi Ind Dev Co Ltd, Zunyi 564300, Peoples R China

第一机构：Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths Int, Guiyang 550081, Peoples R China

通信机构：corresponding author), Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths Int, Guiyang 550081, Peoples R China.

年份：2024

卷号：223

外文期刊名：HYDROMETALLURGY

收录：;EI(收录号：20234214915799);Scopus(收录号：2-s2.0-85174210061);WOS:【SCI-EXPANDED(收录号:WOS:001102011800001)】；

基金：The work was financially supported by the National Natural Science Foundation of China (U1812402) , the Youth Innovation Promotion As- sociation CAS (2021400) , Guizhou Outstanding Young Scientific and Technological Talents Project (2021-5641) , and Guizhou Provincial Science and Technology Project (2023-243) .

语种：英文

外文关键词：Red mud; Oxalic acid; Selective separation; Aluminum; Titanium concentrate

摘要：Red mud discharged from alumina production is a valuable metal resource of great importance in the context of the requirement to reduce the impact of mining on the environment and resource consumption. The efficient dissolution of iron from red mud by oxalic acid has been reported. Although the concentrations of aluminum, silicon, and titanium were also high in the red mud-oxalic acid leachate after iron precipitation, they have received little attention. The present study aims to recover aluminum, silicon, and titanium from red mud-oxalic acid leachate after the precipitation of iron. The leaching efficiencies of aluminum, silicon, and titanium in 1.0 mol/L oxalic acid at 80 degrees C, reached 63-75% after 2 h. Sodium hydroxide, calcium oxide, and calcium carbonate were chosen to adjust the pH of the oxalic acid leachate, and the effective separation of silicon and titanium from the oxalic acid leachate could be achieved at pH 4.0 by stepwise separation using calcium carbonate. A silicon dioxide primary product with a purity of 70.8% was obtained in addition to the aluminum hydroxide primary product. The stepwise selective separation of aluminum, silicon, and titanium from red mud-oxalic acid leachate could assist the values recovery and simultaneously minimize environmental hazards of the acidic leachate.