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Ultrasound-Assisted Leaching of Iron from Silicon Diamond-Wire Saw Cutting Waste
JOM ( IF 2.6 ) Pub Date : 2021-01-02 , DOI: 10.1007/s11837-020-04497-7
Jian Kong , Pengfei Xing , Donghui Wei , Xing Jin , Yanxin Zhuang

Iron removal from silicon powder waste by ultrasound-assisted leaching has been investigated and the leaching conditions optimized to an ultrasonic frequency of 80 kHz, ultrasonic power of 270 W, temperature of 60°C, and sulfuric acid concentration of 12%, achieving an iron removal fraction of 95.24%. The maximum iron removal fraction was obtained after 80 min of leaching without ultrasound, whereas ultrasound-assisted leaching could achieve the same removal fraction after 50 min under the same conditions. The dissolution of iron is a two-step process and follows a homogeneous control model with a second-order rate-controlling step. With the aid of ultrasound, the reaction rate constants khs increased from 0.0677–0.0995 to 0.0792–0.1914 and from 0.0285–0.1086 to 0.0399–0.1422 in the first and second leaching stage, respectively. This increase of the khs values further supports the enhancement induced by the application of ultrasound.



中文翻译:

超声辅助从硅金刚石线锯切屑中浸出铁

已经研究了通过超声辅助浸出法去除硅粉废料中的铁,并优化了浸出条件,以达到80 kHz的超声波频率,270 W的超声波功率,60°C的温度以及12%的硫酸浓度,从而获得了铁去除率达95.24%。在不进行超声波浸出80分钟后,可获得最大的铁去除率,而在相同条件下50分钟后,超声辅助浸出可以达到相同的去除率。铁的溶解是一个两步过程,遵循具有二阶速率控制步骤的均质控制模型。借助超声波,反应速率常数k hs第一浸出阶段和第二浸出阶段分别从0.0677-0.0995增加到0.0792-0.1914,从0.0285-0.1086增加到0.0399-0.1422。k hs值的这种增加进一步支持了由超声的应用引起的增强。

更新日期:2021-01-02
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