Leaching of chromite ore in concentrated KOH by catalytic oxidation using CuO as catalyst

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	Leaching of chromite ore in concentrated KOH by catalytic oxidation using CuO as catalyst
	Liu, Long-jie 1,2; Du, Hao 1,2; Zhang, Yang 1; Zheng, Shi-li 1; Zhang, Yi 1
刊名	TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
	2017-04-01
卷号	27 期号:4 页码:891-900
关键词	chromite ore copper oxide leaching catalytic oxidation
ISSN号	1003-6326
英文摘要	CuO was used as a catalyst in the concentrated KOH solution to enhance the leaching of chromium from the chromite ore. The impacts of temperature, KOH-to-chromite ore mass ratio, CuO-to-chromite ore mass ratio, and gas flow rate on the chromium leaching rate were investigated. The results indicated that CuO played an important role in improving the chromium leaching rate. The leaching rate reached 98% after leaching for 6 h when CuO was applied, whereas it was only 60.8% without CuO under the same reaction conditions: temperature 230 degrees C, KOH-to-ore mass ratio 6: 1, stirring speed 700 r/min, gas flow rate 1 L/min. According to the kinetics study, the catalytic oxidation was controlled by surface chemical reaction and the activation energy was calculated to be 15.79 kJ/mol when the temperature was above 230 degrees C. In contrast, without CuO, the rate-determining step was external diffusion and the apparent activation energy was 38.01 kJ/mol.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Metallurgy & Metallurgical Engineering
研究领域[WOS]	Metallurgy & Metallurgical Engineering
关键词[WOS]	POTASSIUM CHROMATE ; PRESSURE ; ACIDS
收录类别	SCI
语种	英语
WOS记录号	WOS:000404567000020
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/22708]
专题	过程工程研究所_湿法冶金清洁生产技术国家工程实验室
作者单位	1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Long-jie,Du, Hao,Zhang, Yang,et al. Leaching of chromite ore in concentrated KOH by catalytic oxidation using CuO as catalyst[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2017,27(4):891-900.
APA	Liu, Long-jie,Du, Hao,Zhang, Yang,Zheng, Shi-li,&Zhang, Yi.(2017).Leaching of chromite ore in concentrated KOH by catalytic oxidation using CuO as catalyst.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,27(4),891-900.
MLA	Liu, Long-jie,et al."Leaching of chromite ore in concentrated KOH by catalytic oxidation using CuO as catalyst".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 27.4(2017):891-900.