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Leaching of chromite ore in concentrated KOH by catalytic oxidation using CuO as catalyst
Liu, Long-jie1,2; Du, Hao1,2; Zhang, Yang1; Zheng, Shi-li1; Zhang, Yi1
2017-04-01
Source PublicationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN1003-6326
Volume27Issue:4Pages:891-900
Abstract

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.

KeywordChromite Ore Copper Oxide Leaching Catalytic Oxidation
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/S1003-6326(17)60103-1
Indexed BySCI
Language英语
WOS KeywordPotassium Chromate ; Pressure ; Acids
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
Funding OrganizationNational Basic Research of China(2013CB632601) ; National Natural Science Foundation of China(91634111 ; 51404227)
WOS IDWOS:000404567000020
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/22708
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.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
Recommended Citation
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.
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