钙固化碱焙烧−水浸法从二次铝渣中分离氟和铝  

Separation of fluorine and aluminum from secondary aluminum dross by calcium-cured alkali roasting−water leaching

作　　者：董良民 焦芬[1,2] 刘维[1,2] 黄雅琳[1,2] 魏鑫 覃文庆 Liang-min DONG;Fen JIAO;Wei LIU;Ya-lin HUANG;Xin WEI;Wen-qing QIN(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083 [2]中南大学湖南省战略性含钙矿产资源清洁高效利用重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第6期2007-2019,共13页中国有色金属学报（英文版）

基　　金：support by National Key R&D Program of China (Nos.2018YFC1902505,2020YFC1909203);the National Natural Science Foundation of China (No.51874356).

摘　　要：设计一种钙固化碱焙烧−水浸出联合工艺处置二次铝渣,研究CaO用量、NaOH用量、焙烧温度和时间对铝溶出和氟固化行为的影响。在最佳实验条件(焙烧温度1000℃、Al与NaOH摩尔比1꞉0.6、F与CaO摩尔比1꞉2.5、焙烧时间2.0 h)下,氟和铝被分离,其中氟固化率为99.98%,铝溶出率为52.97%。水浸液经蒸发结晶,可得到符合中国工业标准的NaAlO_(2)产品;水浸渣可作为速凝水泥原料。总体而言,此研究为处置二次铝渣提供了一个有效、环保的解决方案。A combined strategy of calcium-cured alkali roasting and water leaching was devised to treat secondary aluminum dross.The effects of calcium oxide dosage,sodium hydroxide dosage,roasting temperature,and time on aluminum extraction behavior and fluorine curing behavior were studied.Under optimal experimental conditions:roasting temperature of 1000℃,Al꞉NaOH mole ratio of 1꞉0.6,F꞉CaO mole ratio of 1꞉2.5,and roasting time of 2.0 h,fluorine and aluminum were separated,with 99.98%of the fluoride solidified and 52.97%of the aluminum extracted.The sodium aluminate products obtained by evaporation and crystallization from leaching solution met the industrial standards of China.The aqueous residue can be used as a raw material for quick-setting cement.Overall,this study provides an effective and environmentally friendly strategy for the treatment of secondary aluminum dross.

关 键 词：二次铝渣 钙固化碱焙烧 分离 氟 铝 偏铝酸钠 清洁生产 

分 类 号：TF821[冶金工程—有色金属冶金]