Optimization of Oxidative Leaching for Vanadium Extraction from Low-Grade Stone Coal Using Response Surface Methodology

Processes

卷:8

Wenbin Xu¹  Tao Chen²  Bo Yan²  Yang Zhou³  Hanzhi Lin³  Zulv Huang³ 

[1] Dongjiang Environmental Company Limited, Shenzhen 518000, China;

[2] SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China;

[3] State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

关键词: vanadium;    stone coal;    oxidation leaching;    optimization;    kinetics;   

DOI  :  10.3390/pr8121534

来源: DOAJ

【 摘 要 】

The feasibility and kinetics of vanadium (V) recovery from oxidative leaching of low-grade stone coal using MnO₂ were investigated. Oxidative leaching processes (OLPs) were designed using response surface methodology (RSM) based on the central composite design (CCD) model. The results show that the order of factors that influence OLPs is leaching temperature > H₂SO₄ concentration > leaching time > MnO₂ dosage. The interaction between leaching temperature and H₂SO₄ concentration on the OLP is the most significant. Vanadium leaching efficiency was 89.3% using 31% H₂SO₄ and 3% MnO₂ at 90 °C for 7.9 h. The kinetics of V leaching from stone coal show that the leaching rate is controlled by chemical reaction through a layer according to the shrinking core model and the activation energy is 55.62 kJ/mol. A comparison of the SEM-EDS results of minerals before and after leaching confirms that the muscovite structure was significantly destroyed and V and aluminum (Al) were effectively dissolved during the OLP.

【 授权许可】

Unknown