Isoconversional kinetic analysis of decomposition of bastnaesite concentrates with calcium hydroxide

被引:9
|
作者
Cen, Peng [1 ]
Bian, Xue [1 ]
Wu, Wenyuan [1 ]
机构
[1] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
关键词
Bastnaesite; Thermal analysis kinetics; Isoconversional method; Calcium hydroxide; Rare earths; RARE-EARTH CONCENTRATE; BAYAN OBO TAILINGS; ACTIVATION-ENERGY; THERMAL-DECOMPOSITION; HYDROCHLORIC-ACID; BASTNASITE; FLOTATION; RECOVERY; MECHANISM; FLUORINE;
D O I
10.1016/j.jre.2020.01.006
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Isoconversional methods combined with thermogravimetry were applied to investigate the decomposition kinetics of bastnaesite concentrates with different amounts of calcium hydroxide added. The apparent activation energy was calculated, and the results indicate that the overall reaction involves more than one single step. The reaction with a lower content (<15 wt%) of calcium hydroxide can be divided into two steps, while the reaction with a higher content (>15 wt%) involves another step which denotes the decomposition of newly formed calcium carbonate during roasting. The activation energy increases with increasing amount of calcium hydroxide in the lower range (0-15 wt%). This is due to the resistance of calcium hydroxide to heat and mass transport. However, more calcium can promote the decomposition reaction more effectively and thus reduce the activation energy. Nonlinear fitting was performed by fitting the experimental data to Avrami-Erofeev model to determine the reaction model and pre-exponential factor. The theoretical models were proven to be reliable for kinetic prediction. (C) 2020 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:1361 / 1371
页数:11
相关论文
共 50 条
  • [21] Kinetic analysis of endothermic degradation of magnesium hydroxide, calcium hydroxide and calcium carbonate in the context of passive fire protection
    Ciudad, Aleix
    Haurie, Laia
    Lacasta, A. M.
    FIRE AND MATERIALS, 2015, 39 (01) : 14 - 25
  • [22] Application of various methods of nonisothermal kinetic analysis to magnesium hydroxide decomposition
    Halikia, Iliana
    Economacou, Antonia
    International Journal of Chemical Kinetics, 1993, 28 (08) : 609 - 631
  • [23] Isoconversional Kinetic Analysis of Decomposition of Nitroimidazoles: Friedman method vs Flynn-Wall-Ozawa Method
    Venkatesh, M.
    Ravi, P.
    Tewari, Surya P.
    JOURNAL OF PHYSICAL CHEMISTRY A, 2013, 117 (40): : 10162 - 10169
  • [24] KINETICS OF DRYING AND DECOMPOSITION OF CALCIUM HYDROXIDE
    DUTTA, S
    SHIRAI, T
    CHEMICAL ENGINEERING SCIENCE, 1974, 29 (09) : 2000 - 2003
  • [25] KINETICS OF THERMAL DECOMPOSITION OF CALCIUM HYDROXIDE
    MIKHAIL, RS
    BRUNAUER, S
    COPELAND, LE
    JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1966, 21 (04) : 394 - &
  • [26] Determined the activation energy of the decomposition of calcium carbonate by nonlinear isoconversional method
    Song, Zhang
    Dan, Tang
    CHEMICAL, MATERIAL AND METALLURGICAL ENGINEERING III, PTS 1-3, 2014, 881-883 : 1522 - +
  • [27] Degradation of tetrabromobisphenol A (TBBA) with calcium hydroxide: a thermo-kinetic analysis
    Ali, Labeeb
    Sivaramakrishnan, Kaushik
    Kuttiyathil, Mohamed Shafi
    Chandrasekaran, Vignesh
    Ahmed, Oday H.
    Al-Harahsheh, Mohammad
    Altarawneh, Mohammednoor
    RSC ADVANCES, 2023, 13 (10) : 6966 - 6982
  • [28] Kinetic study of the thermo-oxidative decomposition of metformin by isoconversional and theoretical methods
    Badran, Ismail
    Manasrah, Abdallah D.
    Hassan, Azfar
    Nassar, Nashaat N.
    THERMOCHIMICA ACTA, 2020, 694
  • [29] ISOCONVERSIONAL KINETIC ANALYSIS OF RESOL-CLAY NANOCOMPOSITES
    Lopez, M.
    Blanco, M.
    Vazquez, A.
    Ramos, J. A.
    Arbelaiz, A.
    Gabilondo, N.
    Echeverria, J. M.
    Mondragon, I.
    JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2009, 96 (02) : 567 - 573
  • [30] Isoconversional kinetic study of the thermal decomposition of sugarcane straw for thermal conversion processes
    Rueda-Ordonez, Yesid Javier
    Tannous, Katia
    BIORESOURCE TECHNOLOGY, 2015, 196 : 136 - 144