赤泥中硫酸选择性浸出铁、钪及动力学研究
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摘要
以硫酸为浸出剂,进行了酸浸初步分离铁、钪的研究,考察了反应时间、反应温度、液固比、硫酸浓度等对浸出率的影响。结果表明,在40℃、液固比10∶1、硫酸浓度10 mol/L条件下浸出30 min,铁、钪浸出率分别为11.32%、58.41%。酸浸铁、钪的动力学研究结果表明,赤泥酸浸铁的过程符合未反应收缩核模型,受化学反应控制,其表观活化能为41.79 kJ/mol;而赤泥酸浸钪的过程符合多相液固区域反应动力学特征,受扩散控制,其表观活化能为6.72 kJ/mol。
With sulfuric acid as the leaching agent, a primary separation of iron and scandium from red mud by using acid leaching process was conducted, and the influences of time and temperature of the reaction, liquid to solid ratio, and sulfuric acid concentration on the leaching rate were investigated. The results showed that the acid leaching process at the temperature of 40 ℃, with the sulfuric acid concentration of 10 mol/L and liquid to solid ratio at 10∶1, resulted in the leaching rate of Fe and Sc at 11.32% and 58.41%, respectively. The kinetic study indicated that the acid leaching process of iron from red mud was controlled by chemical reaction dynamics, following shrinking core mode with an activation reaction energy of 41.79 kJ/mol, while the leaching process of scandium from red mud was controlled by diffusion, following the liquid-solid regional reaction model with an activation reaction energy of 6.72 kJ/mol.
With sulfuric acid as the leaching agent, a primary separation of iron and scandium from red mud by using acid leaching process was conducted, and the influences of time and temperature of the reaction, liquid to solid ratio, and sulfuric acid concentration on the leaching rate were investigated. The results showed that the acid leaching process at the temperature of 40 ℃, with the sulfuric acid concentration of 10 mol/L and liquid to solid ratio at 10∶1, resulted in the leaching rate of Fe and Sc at 11.32% and 58.41%, respectively. The kinetic study indicated that the acid leaching process of iron from red mud was controlled by chemical reaction dynamics, following shrinking core mode with an activation reaction energy of 41.79 kJ/mol, while the leaching process of scandium from red mud was controlled by diffusion, following the liquid-solid regional reaction model with an activation reaction energy of 6.72 kJ/mol.
引文
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[2] 薛生国,李玉冰,郭颖.氧化铝工业赤泥环境影响研究进展[J].中国科学院大学学报,2017(4):401-412.
[3] 闵小波,柴立元,柯勇,等.我国有色冶炼固体废物处理相关技术及政策建议[J].环境保护,2017(20):24-30.
[4] 常军,邵延海,李硕,等.赤泥中有价金属元素综合回收研究现状及进展[J].矿冶,2017,26(3):59-63.
[5] 刘召波.高铁赤泥中钪钠选择性分离提取工艺基础研究[D].北京:北京科技大学冶金与生态工程学院,2017.
[6] 罗宇智,徐璐,史光大.硫酸熟化浸出赤泥中钪的研究[J].有色金属(冶炼部分),2017(4):45-47.
[7] 邹琴,刘海燕,谢华磊.电解锰渣碱浸提硅工艺及动力学研究[J].矿冶工程,2018,38(2):83-87.
[8] 李望,管学茂,朱晓波.赤泥循环酸浸提钛实验及动力学研究[J].稀有金属与硬质合金,2015,43(3):9-12.
[9] 朱晓波,李望,李文中,等.赤泥中钇浸出行为及动力学研究[J].硅酸盐通报,2016,35(10):3367-3372.
[10] 王琪,姜林.硫酸浸出赤泥中铁、铝、钛的工艺研究[J].矿冶工程,2011(4):90-94.
[11] 陈毛毛,陈莉荣.铝矿厂赤泥硫酸浸出动力学研究[J].材料导报,2015,29(18):141-145.
[12] 郭学益,李栋,田庆华,等.硫酸熟化-焙烧法从镍红土矿中回收镍和钴动力学研究[J].中南大学学报(自然科学版),2012,43(4):1222-1226.
[13] 韩其勇.冶金过程动力学[M].北京:冶金工业出版社,1983.
[14] 莫鼎成.冶金动力学[M].长沙:中南工业大学出版社,1988.