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Investigation on influencing mechanisms of phosphogypsum (PG) on the ash fusion behaviors of coal

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  • Li, Fenghai
  • Zhao, Wei
  • Li, Junguo
  • Fan, Hongli
  • Xu, Meiling
  • Han, Guopeng
  • Guo, Mingxi
  • Wang, Zhiqing
  • Huang, Jiejie
  • Fang, Yitian

Abstract

To explore the effects of phosphogypsum (PG) on coal ash fusion characteristics, the ash fusion temperature (AFT) modifications of two coals (Xiaolongtan coal (XLT) and Jiaozuo coal (JZ)) by PG addition, and their mechanisms under a reducing atmosphere were analyzed. With increasing PG mass ratio, the AFT of mixed XLT increased, while the AFT decreased for JZ mixtures. To meet the liquid-slag-discharge requirement during entrained-flow gasification, the PG suitable mass ratios were 4.9%–8.9% and 6.5%–9.0% for XLT and JZ, respectively. The different AFT variations resulted from the changes in its base/acid ratio ((CaO + MgO + Na2O + K2O + Fe2O3 + SO3)/(Al2O3 + SiO2 + P2O5)). With PG addition, the decreasing relative low melting-point (MP) CaAl2Si2O8 and increasing high-calcium minerals (e.g., Ca2Al2SiO7, Ca3SiO5, Ca5P2SiO12, and Ca7MgSi4O16) caused the mixed AFT to increase for high-calcium XLT; decreasing high-MP Al6Si2O13 and increasing CaAl2Si2O8 content caused the mixed AFT for high silicon−aluminum JZ to decrease. The AFT variation might also be explained by the variations in the temperature range (between the appearance of liquid-phase and all minerals complete change into the liquid-phase) and ash composition positions of XLT or JZ mixtures in the SiO2–Al2O3–CaO ternary phase diagram with increasing PG mass ratio.

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  • Li, Fenghai & Zhao, Wei & Li, Junguo & Fan, Hongli & Xu, Meiling & Han, Guopeng & Guo, Mingxi & Wang, Zhiqing & Huang, Jiejie & Fang, Yitian, 2023. "Investigation on influencing mechanisms of phosphogypsum (PG) on the ash fusion behaviors of coal," Energy, Elsevier, vol. 268(C).
    • Handle: RePEc:eee:energy:v:268:y:2023:i:c:s0360544223000932
    DOI: 10.1016/j.energy.2023.126699
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