Evaluation of the thermal and rheological characteristics of minerals in coal using SiO 2 -Al 2 O 3 -CaO-FeO x quaternary system

Cai Hong Wang, Xiong Chao Lin, Sa Sha Yang, Shu Qin Liu, Seong-Ho Yoon, Yong Gang Wang

Research output: Contribution to journalArticle

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Abstract

In the present work, the synergistic effect of components on the mineral behavior in the SiO 2 -Al 2 O 3 -CaO-FeO x quaternary system was tentatively evaluated. The mineral transformation and reaction were analyzed by thermo-mechanical analyzer (TMA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and thermodynamic calculation (FactSage). In addition, the apparent viscosities of synthetic slags, expressed as a function of temperature and composition, were determined using a high temperature rotary viscometer with temperature ranging from 1700℃ to re-solidifying temperature. The results demonstrated that the TMA and DSC approaches were applicable to characterize the mineral behavior under in-situ conditions. Silica and alumina preferred to be transformed to high temperature cristobalite and α-alumina with relatively stable structure and high viscosity, respectively. On the other hand, the reaction and transformation of silica and alumina could be accelerated by some valuable fluxing agents, particularly calcium oxide and iron oxides. The addition of ferrous oxide into synthetic slags could lower its viscosity compared with that of ferric oxide and ferroferric oxide. Furthermore, the reduction of iron oxides to metallic iron remarkably increased the viscosity. Ferric oxide may take part in the random glass network in a similar fashion with alumina. Besides, iron oxides with the oxidation state of Fe 2+ may also act as a modifier under slightly reducing conditions and higher temperatures. The sensitivity of viscosity of mineral matters to temperature excursion decreased with increasing calcium oxide content as calcium oxide was able to enhance the solution ability of iron oxides in the SiO 2 -Al 2 O 3 -CaO-FeO x quaternary system.

Original languageEnglish
Pages (from-to)1025-1033
Number of pages9
JournalRanliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology
Volume44
Issue number9
Publication statusPublished - Sep 1 2016

Fingerprint

Coal
coal
Minerals
iron oxides
minerals
viscosity
Aluminum Oxide
calcium oxides
aluminum oxides
oxides
evaluation
Iron oxides
Viscosity
Alumina
slags
Lime
Silicon Dioxide
Oxides
differential analyzers
heat measurement

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Physical and Theoretical Chemistry

Cite this

Evaluation of the thermal and rheological characteristics of minerals in coal using SiO 2 -Al 2 O 3 -CaO-FeO x quaternary system . / Wang, Cai Hong; Lin, Xiong Chao; Yang, Sa Sha; Liu, Shu Qin; Yoon, Seong-Ho; Wang, Yong Gang.

In: Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology, Vol. 44, No. 9, 01.09.2016, p. 1025-1033.

Research output: Contribution to journalArticle

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