Improvement of iron removal from silica sand using ultrasound-assisted oxalic acid.
Improvement of iron removal from silica sand using ultrasound-assisted oxalic acid.
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DOI：
10.1016/j.ultsonch.2010.07.006
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发表时间：
2011
影响因子：
8.4
通讯作者：
Fei-hu Du;Jing-sheng Li;Xiaoxia Li;Zhizhen Zhang
中科院分区：
文献类型：
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作者：
Fei-hu Du;Jing-sheng Li;Xiaoxia Li;Zhizhen Zhang
本文研究了在无超声波和超声波存在的条件下，草酸水溶液中石英砂中的铁的去除。考察了反应温度、搅拌速度、超声波功率、酸浓度和反应时间等工艺参数。确定了超声波对铁的最佳去除条件为：反应温度95℃，搅拌速度500rpm，超声波功率150W，酸液浓度4g/L，反应时间30min。与传统的搅拌法相比，该方法对铁的浸出过程有显著的加速作用，浸出酸浓度显著降低，脱铁效率显著提高。用粒度、扫描电子显微镜和色度分析对石英砂和浸出固体样品进行了表征，证实了超声辅助浸出的优越性。
This paper deals with the removal of iron from silica sand in aqueous oxalic acid, in the absence and presence of ultrasound. The parameters investigated were the reaction temperature, stirring speed, ultrasound power, acid concentration and reaction time. The optimum conditions for the maximum removal of 75.4% of iron with ultrasound were determined as follows: reaction temperature, 95°C; stirring speed, 500rpm; ultrasound power, 150W; acid concentration, 4g/l; reaction time 30min. The method induces a remarkable acceleration for the iron leaching process, the leach acid concentration reducing dramatically and the removal efficiency increasing considerably, compared to conventional stirring method. The advantages of ultrasound-assisted leaching were also confirmed by characterizing the silica sand and the leached solid samples using particle size, SEM and color measurement analysis.