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Mineral Transform and Specific Heat Capacity Characterization of Blast Furnace Slag with High Al2O3 in Heating Process

Zheng, Haiyan ; Liang, Lisheng ; Du, Jinlei ; Zhou, Shifa ; Jiang, Xin ; Gao, Qiangjian ; Shen, Fengman

Steel research international, 2021-03, Vol.92 (3), p.n/a [Periódico revisado por pares]

Weinheim: Wiley Subscription Services, Inc

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  • Título:
    Mineral Transform and Specific Heat Capacity Characterization of Blast Furnace Slag with High Al2O3 in Heating Process
  • Autor: Zheng, Haiyan ; Liang, Lisheng ; Du, Jinlei ; Zhou, Shifa ; Jiang, Xin ; Gao, Qiangjian ; Shen, Fengman
  • Assuntos: Aluminum oxide ; blast furnace slag with high Al2O3 ; Blast furnace slags ; Calcium aluminate ; Calcium oxide ; Endothermic reactions ; Eutectic reactions ; Eutectic temperature ; Exothermic reactions ; Heating ; High temperature ; Low temperature ; Magnesium oxide ; mineral transform ; Silicon dioxide ; Smelting ; Specific heat ; specific heat capacity ; w(MgO)/w(Al2O3) ratio
  • É parte de: Steel research international, 2021-03, Vol.92 (3), p.n/a
  • Descrição: The specific heat capacity (Cp) of blast furnace (BF) slag critically impacts BF smelting and reports on the Cp of BF slag with high Al2O3 are rare. Mineral transform and Cp characterization of synthesized BF slag (CaO–SiO2–MgO–Al2O3) with high Al2O3 in the heating process are herein discussed. Differential scanning calorimetry curves show a major exothermic peak at a low temperature and multiple endothermic peaks at elevated temperatures. The exothermic peak at approximately 920 °C appears when amorphous SiO2 (or SiO2 in silicate) becomes crystal SiO2 (or SiO2 in silicate). The endothermic peak between 1224–1254 °C is attributed to the reverse eutectic reaction, CaO·Al2O3·2SiO2 + 2CaO·0.5MgO·0.5Al2O3·1.5SiO2 → Liquid, along a eutectic line. CaO·Al2O3·2SiO2 + MgO·SiO2 → Liquid + 2MgO·SiO2 (reverse peritectic reaction) or CaO·Al2O3·2SiO2 + 2MgO·SiO2 → Liquid (reverse eutectic reaction) at approximately 1268 °C will occur with an endothermic reaction in some cases. The sharp endothermic peak between 1282 and 1303 °C is the reverse eutectic reaction, CaO·SiO2 + 2CaO·Al2O3·SiO2 → Liquid. The blunt endothermic peak between 1388 and 1447 °C is the residual slag melting, Solid → Liquid. The relationships of Cp with temperatures and compositions (R, ratio of w(MgO)/w(Al2O3), and w(Al2O3)) are established with a good fit. Herein, mineral transform and specific heat capacity (Cp) characterization of blast furnace slag in heating process are investigated. There are phase transforms from amorphous to crystal and from solid to liquid in all cases. Reverse peritectic reaction or reverse eutectic reaction would proceed in some cases. The relationships of Cp with temperatures and compositions are established with a good fit.
  • Editor: Weinheim: Wiley Subscription Services, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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