摘要
铝灰中富含铝元素,具有极高的回收潜力。通过盐酸浸出分离铝灰中的铝,研究了初始酸浓度、浸出温度、时间、液固比等因素对铝灰中铝浸出率的影响。热力学分析发现,在pH小于2的酸性溶液中铝以Al^(3+)形式存在。浸出试验表明,最优条件为:粒径-150μm、温度80℃、初始酸浓度6 mol/L、液固比10、反应时间120 min,在此条件下Al浸出率可达85.86%。选择未反应收缩核模型进行浸出动力学分析,浸出过程受扩散控制,表观活化能为3.11 kJ/mol。通过提高反应温度、减小原料粒径、加强搅拌等方式可提升铝灰中铝浸出率。
Aluminum dross is rich in aluminum and has high recovery potential.Effects of initial acid concentration,leaching temperature and time,and L/S on leaching rate of aluminum from aluminum dross were studied.Thermodynamic analysis shows that aluminum exists in the form of Al^(3+)in acidic solution when pH value is less than 2.Experimental results show that aluminum leaching rate is 85.86%under the optimum conditions including particle size of-150μm,temperature of 80℃,initial acid concentration of 6 mol/L,L/S of 10,and reaction time of 120 min.The unreacted shrinking core model is used for leaching kinetic analysis.Leaching process is controlled by diffusion with apparent activation energy of 3.11 kJ/mol.Extraction rate of aluminum from aluminum dross can be improved by increasing reaction temperature,reducing raw material particle size,and strengthening stirring.
作者
袁杰
罗亮昆
林安伟
YUAN Jie;LUO Liang-kun;LIN An-wei(School of Chemistry and Materials Engineering,Liupanshui Normal University,Liupanshui 553004,Guizhou,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2022年第6期37-42,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金青年基金资助项目(51904150)
贵州省科技计划项目(黔科合基础[2020]1Y225)
贵州省普通高等学校科技拔尖人才项目(黔教合KY字[2019]056)
六盘水市科技计划项目(52020-2019-05-09)。
关键词
铝灰
酸浸
浸出率
动力学
aluminum dross
acid leaching
leaching rate
kinetics
