摘要
本文采用“硫酸浸出—水解沉淀—结晶”工艺从铝灰中回收硫酸。综合考察了浸出过程中浸出温度、搅拌强度、浸出时间、固液比、硫酸浓度等因素对其浸出率的影响。实验结果表明,该工艺的最佳浸出参数为浸出剂浓度为15%的硫酸、浸出温度为40℃、浸出时间为90min、浸出搅拌强度为300r/min、固液比为1:10,重复试验铝灰中铝的最佳浸出率可达到90.12%。水解沉淀过程中加入过量的(15ml)5%过氧化氢,以氧化其中的杂质,并严格控制终点pH值为4.3。元素分析和X射线衍射分析(XRD)结果表明,产品硫酸铝中产物为Al_(2)(SO_(4))_(3)•18H_(2)O。
In the present work,the process of"sulfuric acid leaching-hydrolysis precipitation-crystallization"is used to recover sulfuric acid from aluminum ash.The influence of leaching temperature,stirring intensity,leaching time,solidliquid ratio,sulfuric acid concentration on the leaching rate during the leaching process were comprehensively investigated.The experimental results show that the optimal leaching parameters of the process are 15%sulfuric acid with a leaching agent concentration,40℃ leaching temperature,90min leaching time,leaching stirring strength 300r/min,solid-liquid ratio 1:10,the best leaching rate of aluminum in aluminum ash can reach 90.12%.Add excess(15ml)5%hydrogen peroxide during the hydrolysis precipitation process to oxidize the impurities in it,and strictly control the end pH value of 4.3.Elemental analysis and X-ray diffraction analysis(XRD)results show that the product aluminum sulfate is Al_(2)(SO_(4))_(3)•18H_(2)O.
作者
杨娜
朱山
李松
YANG Na;ZHU Shan;LI Song(School of Chemistry and Materials Engineering,Liupanshui Normal University,Liupanshui 553000,China)
出处
《世界有色金属》
2021年第15期103-105,共3页
World Nonferrous Metals
基金
国家级大学生创新创业项目(采用铝灰制备高纯硫酸铝的工艺研究,项目编号:201810977008)
贵州省科技厅基础研究计划项目基金(黔科合基础[2019]1292号)
六盘水市冶金固废资源化及环境保护科技创新团队(52020-2019-05-08)。
关键词
铝灰
硫酸铝
固废资源化
工艺优化
Aluminum ash
aluminum sulfate
solid waste recycling
process optimization
