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首页> 外文期刊>Journal of industrial and engineering chemistry >A kinetic study on hydrochloric acid leaching of nickel from Ni-Al2O3 spent catalyst
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A kinetic study on hydrochloric acid leaching of nickel from Ni-Al2O3 spent catalyst

机译：Ni-Al2O3废催化剂中盐酸浸出镍的动力学研究

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摘要

Hydrochloric acid leaching of nickel from spent Ni-Al2O3 catalyst (12.7% Ni, 39.2% Al and 0.68% Fe) has been investigated at a range of conditions by varying particle size (50-180 μm), acid concentration (0.025-2 M), pulp density (0.2-0.4%, w/v) and temperature (293-353 K). Nickel was selectively leached from the catalyst, irrespective of the different conditions. Under the most suitable conditions (1 M HC1, 323 K, stirring at 500 rpm, 50-71 μm particle size), the extent of leaching of Ni and Al after 2 h was 99.9% and 1%, respectively. The XRD pattern of the spent catalyst corresponded to crystalline α-Al2O3 along with elemental Ni. The peak due to elemental Ni was absent in the residue sample produced at the optimum leaching conditions, confirming the complete dissolution of Ni from the spent catalyst. The leaching results were well fitted with the shrinking core model with apparent activation energy of 17 kJ/ mol in the temperature range of 293-353 K indicating a diffusion controlled reaction.
机译：已通过改变粒径（50-180μm），酸浓度（0.025-2 M）在一系列条件下研究了从废Ni-Al2O3催化剂（12.7％Ni，39.2％Al和0.68％Fe）中镍的盐酸浸出），纸浆密度（0.2-0.4％，w / v）和温度（293-353 K）。不管条件如何，都会从催化剂中选择性地浸出镍。在最合适的条件下（1 M HCl，323 K，以500 rpm搅拌，粒径为50-71μm），Ni和Al在2小时后的浸出程度分别为99.9％和1％。废催化剂的XRD图谱与元素Ni对应于晶体α-Al2O3。在最佳浸出条件下生产的残留样品中没有元素镍引起的峰，证实了镍从废催化剂中完全溶解。浸出结果与收缩核模型很好地拟合，在293-353 K的温度范围内具有17 kJ / mol的表观活化能，表明有扩散控制反应。

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