摘要
以铝酸钠溶液和工业石灰为原料在80℃条件下合成了铝酸三钙(TCA),并研究了碳碱浓度、分子比、溶出温度和时间等因素对TCA中氧化铝溶出性能的影响规律。通过X射线衍射(XRD),扫描电镜(SEM)和粒度分析对TCA以及溶出产物进行了表征。结果表明:TCA的氧化铝溶出率随碳碱浓度、溶出温度的提高而增加,而溶出产物的平均粒径随之减小;溶液分子比对TCA的溶出率和平均粒径影响不大;增加溶出时间有利于提高TCA的氧化铝溶出率,当时间为60 min时反应基本达到平衡。TCA的最佳溶出条件为:碳碱浓度为145 g/L,溶液分子比为2.22,溶出温度为180℃,时间为60 min,此时氧化铝溶出率达到92%左右。TCA的溶出产物为碳酸钙,其微观形貌为结晶良好、粒度均匀的立方体。
Tricalcium aluminate(TCA)was synthesized from sodium aluminate solution and industrial lime at 80℃.The effects of sodium carbonate concentration,molecular ratio,leaching temperature and time on the leaching properties of alumina from TCA were investigated.TCA and its digestion products were characterized by XRD,SEM and size analysis.The results showed that the leaching efficiency of alumina from TCA increased with the rise of sodium carbonate concentration and leaching temperature,but the average particle size of digestion products was decreased;The leaching efficiency of TCA and average particle size were not affected greatly by the molecular ratio of solution;It was beneficial to improving the leaching efficiency of alumina from TCA by increasing the leaching time,which will reach the equilibrium when the reaction time was 60 min.The alumina leaching efficiency of TCA can reach 92%under the optimum conditions:sodium carbonate concentration is 145 g/L,the molecular ratio of solution is 2.22,the leaching temperature is 180℃and the leaching time is 60 min.The digestion product of TCA is cubic calcium carbonate with good crystallization and uniform particle size.
作者
刘吉龙
潘晓林
程涛
武莎莎
于海燕
Liu Jilong;Pan Xiaolin;Cheng Tao;Wu Shasha;Yu Haiyan(Key Laboratory for Ecological Metallurgy of Multimetallic Mineral under the Ministry of Education,Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;Guangxi Huasheng New Materials Co.,Ltd.,Fangchenggang 538000,China)
出处
《轻金属》
北大核心
2021年第3期21-25,共5页
Light Metals
基金
国家自然科学基金资助项目(编号:51774079)
中央高校基本科研业务费资助项目(编号:N182508026)
关键词
铝酸三钙
溶出
氧化铝
铝酸钠溶液
tricalcium aluminate
leaching
alumina
sodium aluminate solution
