Effect of Na_(2)CO_(3)Roasting Activation on Acid Leaching Property of Fly Ash  

作　　者：LIU Chenjia ZHAO Aichun YE Xin ZHAO Zi ZHANG Tingan YANG Xiaorong QIN Yanmei 刘宸嘉;赵爱春

机构地区：[1]School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China [2]Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education,Northeastern University,Shenyang 110004,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第6期1613-1620,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.U1710257);the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2019L0656);the Doctoral Research Foundation of Taiyuan University of Science and Technology,China(No.20142001);the Open Foundation Program of Key Laboratory for Ecological Metallurgy of Multimetallic Mineral,Ministry of Education,China(No.2020003);the Supported by Fundamental Research Program of Shanxi Province,China(No.202103021224281)。

摘　　要：By using high-alumina fly ash as raw material,a process was proposed for activating the fly ash with Na_(2)CO_(3)calcination and extracting aluminum from activated clinker with sulfuric acid leaching.The feasibility of roasting process of activated fly ash by Na_(2)CO_(3)was discussed based on thermodynamic analysis.The experimental results showed that Na_(2)CO_(3)gradually reactes with mullite over 700 K to produce NaAlSiO_(4).The optimal process conditions for the activation stage are:a material ratio of 1:1 between sodium carbonate and fly ash,a calcination temperature of 900℃,and a calcination time of 2.5 hours.Under these conditions,the leaching rate of aluminum is 90.3%.By comparing the SEM and XRD analysis of raw and clinker materials,it could be concluded that the mullite phase of fly ash is almost completely destroyed and transformed into sodium aluminosilicate with good acid solubility.

关 键 词：fly ash calcination activation acid leaching ALUMINUM 

分 类 号：X773[环境科学与工程—环境工程]