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Structure Evolution and Crystallization Behavior of CaO–SiO 2 -Based Slags with Varying Carbon
Transactions of the Indian Institute of Metals ( IF 1.6 ) Pub Date : 2020-09-11 , DOI: 10.1007/s12666-020-02080-x
Shaopeng Gu , Guanghua Wen , Junli Guo , Ping Tang , Qiang Liu

The effect of carbon on the structure and crystallization behavior of CaO–SiO2-based slags was investigated through Raman and single hot thermocouple technique. Raman analysis showed that with increasing carbon, Q3, Q2 increased, Q1, Q0 decreased (Qn, n is the number of bridge oxygen in a [SiO4]-tetrahedral unit), and then the degree of polymerization (i.e., the complexity of silicate slag network structure) increased. The time–temperature-transformation result showed that the incubation time first prolonged and then shortened with adding carbon, which was related to the form of carbon in slags. When carbon dissolved in slags, it reacted with O2−, increased viscosity, and then inhibited the crystallization property. When carbons existed in the particles form, it enhanced the heterogeneous nucleation and then the crystallization behavior. The crystallization kinetics research indicated that with the addition of carbon, the limiting factor of crystallization could be converted from interface reaction controlled to diffusion controlled and then to interface reaction controlled again. Concurrently, the activation energy of crystallization first increased from 370.36 to 446.61 kJ/mol and then reduced to 313.37 kJ/mol.



中文翻译:

碳变化的CaO-SiO 2基渣的结构演变和结晶行为

通过拉曼和单热电偶技术研究了碳对CaO-SiO 2基炉渣的结构和结晶行为的影响。拉曼分析表明,随着碳的增加,Q 3,Q 2增加,Q 1,Q 0减小(Q nn是[SiO 4]-四面体单元),然后聚合度(即硅酸盐渣网络结构的复杂性)增加。时间-温度转化结果表明,随着碳的添加,孵化时间先延长,然后缩短,这与炉渣中碳的形态有关。当碳溶解在炉渣中时,会与O 2−反应,增加粘度,然后抑制结晶性能。当碳以颗粒形式存在时,它增强了异相成核,进而增强了结晶行为。结晶动力学研究表明,随着碳的加入,结晶的限制因子可以从界面反应控制转变为扩散控制,然后再转变为界面反应控制。同时,结晶的活化能首先从370.36增加到446.61 kJ / mol,然后降低到313.37 kJ / mol。

更新日期:2020-09-11
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