Sustainability Cluster, School of Advanced Engineering, University of Petroleum and Energy Studies, Dehradun, Uttarakhand, 248007, India.
Department of Microbiology, School of Health Science and Technology, University of Petroleum and Energy Studies, Dehradun, Uttarakhand, 248007, India.
Environ Geochem Health. 2024 Feb 11;46(2):67. doi: 10.1007/s10653-024-01868-w.
The jarosite waste used during this study consists of minute amount of arsenic that has a potential to be leached into environment when kept in open area. This study tried to recover arsenic from jarosite waste using hydrometallurgical treatment. The comprehensive characterization of jarosite samples was performed using various analytical techniques, including X-ray diffraction (XRD), Fourier transform Infrared (FTIR), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX), and it was characterized as natrojarosite. For optimal removal of arsenic, the response surface methodology (RSM) was applied with the key factors, including dosage (A), time (B), temperature (C), and acid concentration (D) on the recovery of arsenic. The results indicated that the dosage (A) and acid concentration (D) demonstrated significant positive effects on arsenic recovery. As expected, the higher dosage and acid concentration was associated with increased recovery percentages for the arsenic from jarosite. Whereas time (B) and temperature (C) did not exhibit statistically significant recovery of arsenic within the specified experimental range. The contour plots showed the optimal operating conditions for the highest recovery percentage was approximately 52.61% when 2.5 g of jarosite was treated with 10 mol/L acid for 150 min at operating temperature of 80°. Although our study showed very moderate recovery of arsenic, it is first report where arsenic has been removed from jarosite waste. Readjustment of range of operating parameters would provide more insight into the further optimization of the yield.
本研究中使用的铁钾矾废物含有微量的砷，当暴露在开放环境中时，有可能浸出到环境中。本研究试图采用湿法冶金处理从铁钾矾废物中回收砷。采用各种分析技术，包括 X 射线衍射（XRD）、傅里叶变换红外（FTIR）、扫描电子显微镜（SEM）和能谱（EDX），对铁钾矾样品进行了全面的表征，结果表明其为钠铁矾。为了实现砷的最佳去除效果，采用响应面法（RSM），以药剂用量（A）、时间（B）、温度（C）和酸浓度（D）作为关键因素，研究了砷的回收情况。结果表明，药剂用量（A）和酸浓度（D）对砷的回收有显著的积极影响。如预期的那样，较高的药剂用量和酸浓度与铁钾矾中砷的回收百分比增加有关。而时间（B）和温度（C）在规定的实验范围内，对砷的回收没有表现出统计学上的显著影响。等高线图显示，在操作温度为 80°C、用 10 mol/L 酸处理 2.5 g 铁钾矾 150 min 的最佳操作条件下，砷的最高回收率约为 52.61%。虽然我们的研究表明砷的回收效果非常适中，但这是首次从铁钾矾废物中去除砷的报道。重新调整操作参数范围将为进一步优化产率提供更多的见解。
