Temperature variation of V-bearing stone coal during decarbonization roasting and effect of roasting conditions

Abstract

V-bearing stone coal is an important vanadium resource with huge reserves in China. For stone coal with high carbon content, the decarbonization process improves the vanadium leaching rate and reduces the acid consumption. Study of decarbonization temperature of stone coal is beneficial for avoiding high-temperature sintering and utilizing its heat, which is meaningful for efficient and energy-saving roasting. In this paper, the optimum roasting conditions of 650 °C, 50 min, 500 mL/min, and 20% O₂ were determined. Under the optimal decarbonization and leaching indicators, the entire process of stone coal suspension roasting was systematically analyzed and studied. Within the initial 3.9 min, the sample was rapidly heated to 560.1 °C and continuing to 10.3 min, the sample temperature raised the highest peak of 741.5 °C with the decomposition of dolomite and kaolinite. Finally, the sample was cooled to 622.5 °C at the combustion end. This indicated that the decarbonization mainly occurs in the initial 30 min and the maximum temperature of shale is about 120 °C higher than the final temperature caused by carbon combustion. In addition, intense combustion and local sintering caused by high temperatures and high oxygen content should be seriously avoided.

Keywords

temperature variation / decarbonization / V-bearing stone coal / suspension roasting

References

[1] ZhangY-m, BaoS-x, LiuT, et al. . The technology of extracting vanadium from stone coal in China: History, current status and future prospects [J]. Hydrometallurgy, 2011, 109(1–2): 116-124

[2] HuP-c, ZhangY-min. Efficient vanadium extraction from shale with high silicon content using a short flow process by roasting-water leaching: Laboratory and industrial scale research [J]. Silicon, 2022, 14(7): 3775-3784

[3] BAI Zhe, HAN Yue-xin, JIN Jian-ping, et al. Decarbonization kinetics for fluidized roasting of vanadium-bearing carbonaceous shale [J]. Journal of Thermal Analysis and Calorimetry, 2023. DOI: https://doi.org/10.1007/s10973-023-12135-y.

[4] XiangJ-y, HuangQ-y, LvX-w, et al. . Extraction of vanadium from converter slag by two-step sulfuric acid leaching process [J]. Journal of Cleaner Production, 2018, 170: 1089-1101

[5] XuJ, ZhangY-q, ZhuX-b, et al. . Boosting catalytic activities of carbon felt electrode towards redox reactions of vanadium ions by defect engineering [J]. Journal of Central South University, 2022, 29(9): 2956-2967

[6] DaiS-f, ZhengX, WangX-b, et al. . Stone coal in China: A review [J]. International Geology Review, 2018, 60(5–6): 736-753

[7] LiW, MaC, GongW-h, et al. . Clean production technology for effective recovery of vanadium from shale: Interaction between activators and vanadium-loaded minerals [J]. Journal of Cleaner Production, 2021, 315: 128170

[8] CHENG Shao-kai, LI Wen-bo, HAN Yue-xin, et al. Recent process developments in beneficiation and metallurgy of rare earths: A review [J]. Journal of Rare Earths, 2023. DOI: https://doi.org/10.1016/j.jre.2023.03.017.

[9] YuanY-z, ZhangY-m, LiSheng. The effect of electric field intensification on vanadium extraction from shale via microwave roasting-acid leching process [J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2021, 618126443

[10] AnjumF, ShahidM, AkcilA. Biohydrometallurgy techniques of low grade ores: A review on black shale [J]. Hydrometallurgy, 2012, 117–1181-12

[11] TangZ-d, ZhouZ-y, JinJ-p, et al. . Vanadium extraction from stone coal using a novel two-stage roasting technology [J]. Fuel, 2022, 321: 124031

[12] ZhouZ-y, JinJ-p, ZhuY-m, et al. . Process mineralogical characterization and vanadium extraction from vanadium-bearing shale by oxidation roasting-acid leaching [J]. Advanced Powder Technology, 2022, 33(11): 103834

[13] WangB, LiuT, ZhangY-m, et al. . Effect of CaF₂/CaO composite additive on roasting of vanadium-bearing stone coal and acid leaching kinetics [J]. Minerals, 2017, 7343

[14] CaiZ-l, ZhangY-m, LiuT, et al. . Mechanisms of vanadium recovery from stone coal by novel BaCO₃/CaO composite additive roasting and acid leaching technology [J]. Minerals, 2016, 6226

[15] YuanY-z, ZhangY-m, LiuT, et al. . Comparison of microwave and conventional blank roasting and of their effects on vanadium oxidation in stone coal [J]. Journal of Microwave Power and Electromagnetic Energy, 2016, 50281-93

[16] YuanY-z, ZhangY-m, LiuT, et al. . Microwave roasting with size grading based on the influence of carbon on vanadium extraction from stone coal via microwave roasting-acid leaching [J]. RSC Advances, 2017, 7(3): 1387-1395

[17] WangM-y, XianP-f, WangX-w, et al. . Extraction of vanadium from stone coal by microwave assisted sulfation roasting [J]. JOM, 2015, 67(2): 369-374

[18] PengH, GuoJ, ZhangX-ran. Leaching kinetics of vanadium from calcium-roasting high-chromium vanadium slag enhanced by electric field [J]. ACS Omega, 2020, 5(28): 17664-17671

[19] ZhaoY-l, ZhangY-m, BaoS-x, et al. . Effect of stone coal chemical composition on sintering behavior during roasting [J]. Industrial & Engineering Chemistry Research, 2014, 53(1): 157-163

[20] YuanS, QinY-h, JinY-p, et al. . Improving vanadium extraction from refractory stone coal by suspension roasting [J]. Transactions of Nonferrous Metals Society of China, 2023, 33(3): 902-916

[21] ZhengQ-s, ZhangY-m, LiuT, et al. . Removal process of structural oxygen from tetrahedrons in muscovite during acid leaching of vanadium-bearing shale [J]. Minerals, 2018, 8(5): 208

[22] ZhengQ-s, ZhangY-m, LiuT, et al. . Optimal location of vanadium in muscovite and its geometrical and electronic properties by DFT calculation [J]. Minerals, 2017, 7332

[23] YangX-l, FengY-l, LiH-r, et al. . Effect of preroasting on the preoxidation of vanadium in high-carbon stone coal [J]. Asia-Pacific Journal of Chemical Engineering, 2018, 134e2216

[24] ZhengQ-s, ZhangY-m, XueN-nan. Migration and coordination of vanadium separating from black shale involved by fluoride [J]. Separation and Purification Technology, 2021, 266118552

[25] BaiZ, HanY-x, JinJ-p, et al. . Extraction of vanadium from black shale by novel two-step fluidized roasting process [J]. Powder Technology, 2022, 408117745

[26] YuanY-z, ZhangY-m, LiuT, et al. . Optimization of microwave roasting-acid leaching process for vanadium extraction from shale via response surface methodology [J]. Journal of Cleaner Production, 2019, 234494-502

[27] WangK, HanT, DengJ, et al. . Comparison of combustion characteristics and kinetics of Jurassic and Carboniferous-Permian coals in China [J]. Energy, 2022, 254124315

[28] ZhaoY-l, WangW, ZhangY-m, et al. . In-situ investigation on mineral phase transition during roasting of vanadium-bearing stone coal [J]. Advanced Powder Technology, 2017, 28(3): 1103-1107

[29] DahaniW, JaksaI G N B S, MarwanzaI, et al. The effect of pre-roasting on nickel extraction from limonite ore by acid leaching method [C], 2020, Penang, Malaysia, AIP Publishing

[30] YuanS, HeM-y, WangR-f, et al. . Multistage suspension roasting of refractory stone coal: Enhanced extraction based on decarburization and vanadium oxidation [J]. Powder Technology, 2022, 405117532

[31] YuanY-z, ZhangY-m, HuP-cheng. Formation mechanism and control method of the silicate minerals-based coating (SMC) in blank roasting process of vanadium-bearing shale [J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2020, 592124535

[32] ZhangC-q, SunC-y, LiH, et al. . Blank roasting kinetics of illite type vanadium bearing stone coal [J]. Journal of Materials Research and Technology, 2020, 9(4): 7363-7369

[33] WangJ-p, ZhangY-m, HuangJ, et al. . Kinetic and mechanism study of vanadium acid leaching from black shale using microwave heating method [J]. JOM, 2018, 70(6): 1031-1036

[34] ChenT-j, ZhangY-m, SongS-xian. Improved extraction of vanadium from a Chinese vanadium-bearing stone coal using a modified roast-leach process [J]. Asia-Pacific Journal of Chemical Engineering, 2010, 5(5): 778-784

[35] ZengX, WangF, ZhangH-f, et al. . Extraction of vanadium from stone coal by roasting in a fluidized bed reactor [J]. Fuel, 2015, 142180-188

[36] LuS-h, PanJ, ZhuD-q, et al. . Investigation on activation technology of self-heating decarbonization of coal gangue by a sintering process [J]. Journal of Central South University, 2023, 30(4): 1158-1167

[37] LuoL, LiuJ-x, ZhangH, et al. . TG-MS-FTIR study on pyrolysis behavior of superfine pulverized coal [J]. Journal of Analytical and Applied Pyrolysis, 2017, 128: 64-74

[38] ZhaoY-l, KangS-c, WangW, et al. . Decomposition characteristics of compound additive and effect of roasting atmosphere on vanadium extraction from stone coal [J]. Asia-Pacific Journal of Chemical Engineering, 2017, 12(3): 374-380

[39] GunasekaranS, AnbalaganG. Thermal decomposition of natural dolomite [J]. Bulletin of Materials Science, 2007, 30(4): 339-344

[40] BaiZ, HanY-x, JinJ-p, et al. . Crystal transformation of sericite during fluidized roasting: A study combining experiment and simulation [J]. Minerals, 2022, 12101223

[41] ZhangH, DouB-l, ZhangH, et al. . Study on non-isothermal kinetics and the influence of calcium oxide on hydrogen production during bituminous coal pyrolysis [J]. Journal of Analytical and Applied Pyrolysis, 2020, 150104888

[42] ZouK, XiaoJ-h, LiangG-j, et al. . Effective extraction of vanadium from bauxite-type vanadium ore using roasting and leaching [J]. Metals, 2021, 1191342

[43] LiuS-y, XueW-h, WangL-jun. Extraction of the rare element vanadium from vanadium-containing materials by chlorination method: A critical review [J]. Metals, 2021, 1181301

[44] HuangJ, ZhangY-m, HuangJ, et al. . Selective leaching of vanadium from roasted stone coal by dilute sulfuric acid dephosphorization-two-stage pressure acid leaching [J]. Minerals, 2016, 6375

[45] ChenF, ZhangY-m, HuangJ, et al. . Mechanism of enhancing extraction of vanadium from stone coal by roasting with MgO [J]. Minerals, 2017, 7333