CaC2 Production from Pulverized Coke and CaO at Low Temperatures-Reaction Mechanisms
CaC2 Production from Pulverized Coke and CaO at Low Temperatures-Reaction Mechanisms
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低温粉焦和 CaO 生产 CaC2-反应机理
DOI：
10.1021/ie300671w
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发表时间：
2012-08-22
影响因子：
4.2
通讯作者：
Liu, Zhenyu
中科院分区：
文献类型：
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作者：
Li, Guodong;Liu, Qingya;Liu, Zhenyu
在比当前电弧技术所需的温度（2100-2200摄氏度）低约400摄氏度的温度下，用粉末进料生产CaC 2被证明是可行的，这导致了自热工艺的发展。为了反应器设计的目的，焦炭（C）与CaO在温度高达1750 ℃的反应机理进行了研究，在热重分析仪（TGA）与质谱仪（MS）耦合。结果表明，C与CaO的反应通常分三个阶段进行，从1460 ℃开始形成CaC 2，然后是CaC 2与CaO的反应和CaC 2的分解。第二阶段是观察到的，只有在完全消耗的C，而第三个是由表面蒸发的Ca。提出了焦炭和CaO颗粒表面的反应行为，包括三个阶段的反应和CaC 2-CaO共晶的作用，促进CaO的扩散和CaC 2的生产。
CaC2 production with pulverized feeds was proven viable at temperatures about 400 degrees C lower than that required by the current electric arc technology (2100-2200 degrees C), which led to development of an autothermal process. For the purpose of reactor design, the reaction mechanism of coke (C) with CaO at temperatures up to 1750 degrees C is studied in a thermogravimetric analyzer (TGA) coupled with a mass spectrometer (MS). Results indicate that the reaction of C with CaO generally proceeds in three stages, starting at 1460 degrees C for CaC2 formation, followed by reaction of CaC2 with CaO and by decomposition of CaC2. The second stage is observable only at the complete consumption of C while the third is controlled by surface evaporation of Ca. Reaction behavior at the surface of coke and CaO particles is proposed, including the three-stage reactions and the role of CaC2-CaO eutectics, that promotes CaO diffusion and CaC2 production.