Optimization of process parameters and dissolution kinetics of nickel and cobalt from lateritic chromite overburden using organic acids
Optimization of process parameters and dissolution kinetics of nickel and cobalt from lateritic chromite overburden using organic acids
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DOI：
10.1002/jctb.4288
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发表时间：
2014-10
影响因子：
3.4
通讯作者：
Supratim Biswas;S. Chakraborty;M. Chaudhuri;P. C. Banerjee;S. Mukherjee;Rajib Dey
中科院分区：
文献类型：
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作者：
Supratim Biswas;S. Chakraborty;M. Chaudhuri;P. C. Banerjee;S. Mukherjee;Rajib Dey
背景技术背景：采用响应面法（RSM）结合Box-Behnken设计（BBD）对印度奥里萨邦Sukinda矿区焙烧（600 ℃）铬铁矿覆盖层的浸出动力学进行了研究。研究了草酸、柠檬酸和葡萄糖酸浓度（50 - 150 mmol L −1）、反应温度（60 ℃至80 ℃）和时间（最多3 h）对金属（镍和钴）溶解的影响。研究结果：在80 ° C下，使用150 mmol L −1的草酸在3 h内分别实现了63.61%和44.33%的镍和钴萃取;与其他酸相比，草酸浸出更多的金属。镍的相关表观活化能为74 kJ mol −1，钴的表观活化能在第一个小时为84.37 kJ mol −1，其余时间为80.99 kJ mol −1，因为钴浸出遵循两相动力学。结论：镍和钴从焙烧的铬铁矿覆盖层中的溶解高度依赖于矿石矿物对有机酸侵蚀的顺应性。镍的浸出数据符合Ginstling Brounsthein（GB）型方程的三维扩散机制，而钴的混合动力学模型，包括球形几何和GB方程。本工作提出了最大限度地回收镍和钴的铬铁矿覆盖层使用有机酸迄今报道。c 2013年化学工业协会支持信息可以在本文的在线版本中找到。
BACKGROUND: Leaching kinetics of the roasted (at 600 ◦ C) chromite overburden of Sukinda mines Orissa, India, was studied with optimized data generated through response surface methodology (RSM) coupled with Box-Behnken design (BBD). The effects of oxalic, citric and gluconic acid concentration (50 – 150 mmol L −1 ), reaction temperature (60 ◦ to 80 ◦ C) and period (up to 3 h) on metal (nickel and cobalt) dissolution were examined. RESULTS: Extraction of nickel and cobalt to the extent of 63.61% and 44.33%, respectively, was achieved using 150 mmol L −1 oxalic acid at 80 ◦ C in 3 h; compared with other acids, oxalic acid leached more of the metals. Associated apparent activation energy for Ni was 74 kJ mol −1 , and that for cobalt was 84.37 kJ mol −1 during the first hour, and 80.99 kJ mol −1 for the remaining period since cobalt leaching followed biphasic kinetics. CONCLUSION: Dissolution of nickel and cobalt from the roasted chromite overburden was highly dependent on the amenability of ore minerals to organic acid attack. Nickel leaching data fit the three-dimensional diffusion mechanism of the type Ginstling Brounsthein (GB) equation while a mixed kinetic model consisting of spherical geometry and the GB equation was followed for cobalt. This work presents maximum recovery of nickel and cobalt from chromite overburden using organic acid reported to date. c � 2013 Society of Chemical Industry Supportinginformationmaybefoundintheonlineversionofthisarticle.