摘要
悬浮碳化工艺是碱性赤泥常压下回收碱的新工艺。以该工艺为研究对象,用双膜理论揭示了在赤泥浆液中进行的气、液、固三相碳化反应的机理,并从化学反应动力学的角度对整个碳化反应过程进行了探讨和研究。阐述了工艺中不同碳化反应阶段的反应行为,给予了理论上的解释,同时对工艺的4个影响因素(反应时间、反应温度、液固比和二氧化碳通入量)进行了理论分析。研究表明,该回收过程的控制步骤是二氧化碳和碱的溶解与扩散传质,4个因素对回收工艺本身有较大影响。对于新工艺的反应行为和机理的分析为悬浮碳化法顺利实现工业化提供了重要的理论依据,并为同类工艺提供了可靠的理论研究方法。
The suspension and carbonation technology （ SCT） is a new technology about alkali recovery from basic red mud under normal pressure. In the article ,this technology was regarded as subject and the gas- liquid- solid three- phase reaction mechanism in the slurry reactor was revealed by double - film theory. The carbonation reaction process was analyzed and the reaction mechanism was discussed from the viewpoint of chemical reaction kinetics. The reaction behaviors of different carbonation reaction stages of the recovery process were described and explained in theory. Meanwhile, the four influential factors of the process, such as reaction time, reaction temperature,liquid/solid ratio and CO2 flow velocity were analyzed theoretically. The results showed that the entire process is controlled by the dissolution, diffusion and mass transfer of CO2 and alkali;the four factors influence the recovery process itself greatly. The research not only provides the vital theoretical basis for industrialization of the SCT, but also provides reliable theoretical method for similar technology.
出处
《无机盐工业》
CAS
北大核心
2008年第5期39-41,61,共4页
Inorganic Chemicals Industry
关键词
悬浮碳化
碱回收
赤泥
双膜理论
suspension and carbonation
alkali recovery
red mud
double - film theory
