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Roasting and leaching behaviors of vanadium and chromium in calcification roasting-acid leaching of high-chromium vanadium slag
Alternative TitleRoasting and leaching behaviors of vanadium and chromium in calcification roasting-acid leaching of high-chromium vanadium slag
Wen Jing1; Jiang Tao1; Zhou Mi1; Gao Huiyang1; Liu Jiayi1; Xue Xiangxin1
2018
Source PublicationINTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
ISSN1674-4799
Volume25Issue:5Pages:515-526
AbstractCalcification roasting-acid leaching of high-chromium vanadium slag (HCVS) was conducted to elucidate the roasting and leaching behaviors of vanadium and chromium. The effects of the purity of CaO, molar ratio between CaO and V2O5 (n(CaO)/n(V2O5)), roasting temperature, holding time, and the heating rate used in the oxidation-calcification processes were investigated. The roasting process and mechanism were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetry-differential scanning calorimetry (TG-DSC). The results show that most of vanadium reacted with CaO to generate calcium vanadates and transferred into the leaching liquid, whereas almost all of the chromium remained in the leaching residue in the form of (Fe0.6Cr0.4)(2)O-3. Variation trends of the vanadium and chromium leaching ratios were always opposite because of the competitive reactions of oxidation and calcification between vanadium and chromium with CaO. Moreover, CaO was more likely to combine with vanadium, as further confirmed by thermodynamic analysis. When the HCVS with CaO added in an n(CaO)/n(V2O5) ratio of 0.5 was roasted in an air atmosphere at a heating rate of 10 degrees C/min from room temperature to 950 degrees C and maintained at this temperature for 60 min, the leaching ratios of vanadium and chromium reached 91.14% and 0.49%, respectively; thus, efficient extraction of vanadium from HCVS was achieved and the leaching residue could be used as a new raw material for the extraction of chromium. Furthermore, the oxidation and calcification reactions of the spinel phases occurred at 592 and 630 degrees C for n(CaO)/n(V2O5) ratios of 0.5 and 5, respectively.
Other AbstractCalcification roasting-acid leaching of high-chromium vanadium slag (HCVS) was conducted to elucidate the roasting and leaching behaviors of vanadium and chromium. The effects of the purity of CaO, molar ratio between CaO and V_2O_5 (n(CaO)/n(V_2O_5)), roasting temperature, holding time, and the heating rate used in the oxidation-calcification processes were investigated. The roasting process and mechanism were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetry-differential scanning calorimetry (TG-DSC). The results show that most of vanadium reacted with CaO to generate calcium vanadates and transferred into the leaching liquid, whereas almost all of the chromium remained in the leaching residue in the form of (Fe_(0.6)Cr_(0.4))_2O_3. Variation trends of the vanadium and chromium leaching ratios were always opposite because of the competitive reactions of oxidation and calcification between vanadium and chromium with CaO. Moreover, CaO was more likely to combine with vanadium, as further confirmed by thermodynamic analysis. When the HCVS with CaO added in an n(CaO)/n(V_2O_5) ratio of 0.5 was roasted in an air atmosphere at a heating rate of 10oC/min from room temperature to 950°C and maintained at this temperature for 60 min, the leaching ratios of vanadium and chromium reached 91.14% and 0.49%, respectively; thus, efficient extraction of vanadium from HCVS was achieved and the leaching residue could be used as a new raw material for the extraction of chromium. Furthermore, the oxidation and calcification reactions of the spinel phases occurred at 592 and 630°C for n(CaO)/n(V_2O_5) ratios of 0.5 and 5, respectively.
KeywordCALCIUM-OXIDE SOLID-WASTE OXIDATION EXTRACTION CARBONATE MECHANISM REMOVAL CR(VI) high-chromium vanadium slag calcification roasting roasting behaviors leaching behaviors vanadium extraction
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [National Basic Research Program of China] ; [Fundamental Funds for the Central Universities]
CSCD IDCSCD:6242210
Citation statistics
Cited Times:4[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/155104
Collection中国科学院金属研究所
Affiliation1.东北大学
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Wen Jing,Jiang Tao,Zhou Mi,et al. Roasting and leaching behaviors of vanadium and chromium in calcification roasting-acid leaching of high-chromium vanadium slag[J]. INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS,2018,25(5):515-526.
APA Wen Jing,Jiang Tao,Zhou Mi,Gao Huiyang,Liu Jiayi,&Xue Xiangxin.(2018).Roasting and leaching behaviors of vanadium and chromium in calcification roasting-acid leaching of high-chromium vanadium slag.INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS,25(5),515-526.
MLA Wen Jing,et al."Roasting and leaching behaviors of vanadium and chromium in calcification roasting-acid leaching of high-chromium vanadium slag".INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS 25.5(2018):515-526.
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