Fadoua Laasri, Adrian Carrillo Garcia, Jamal Chaouki
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引用次数: 0
摘要
磷石膏 (PG) 是磷酸生产的副产品,主要成分是硫酸钙 (CaSO4)。磷石膏管理是磷酸行业的一个重要问题。作为一种溶液,PG 被分解以提取二氧化硫 (SO2),再循环用于生产硫酸 (H2SO4)。一氧化碳(CO)会降低 PG 分解的温度,产生一氧化钙(CaO)和硫化钙(CaS)。本研究旨在通过考虑 CO 分压对反应方案和动力学的影响,建立还原条件下 PG 分解的动力学模型。在几种 CO 分压下使用热重分析仪(TGA)进行的测试和热力学研究表明,PG 分解产生 CaS 和 CaO 是平行反应,而对每种产物的选择性取决于温度和 CO 分压。作为动力学研究的一部分,分别估算了 CaS 和 CaO 生成的三重动力学。每个反应(CaS 和 CaO 生成)的活化能分别定义为 259.0 和 140.3 kJ/mol。PG 与 CO 分解的整体动力学模型显示,扩散和界面反应(表面反应和吸附)同样是控制步骤。PG 与 CO 的还原是通过 CO 在 CaSO4 表面的吸附实现的。
Effect of CO partial pressure on phosphogypsum decomposition kinetics
Phosphogypsum (PG) is a byproduct of phosphoric acid production and consists mainly of calcium sulfate (CaSO4). PG management is a critical concern in the phosphoric acid industry. As a solution, PG is decomposed to extract sulfur dioxide (SO2), which is recycled to produce sulfuric acid (H2SO4). Carbon monoxide (CO) decreases the temperature of PG decomposition, producing calcium monoxide (CaO) and calcium sulfide (CaS). This work aims to develop a kinetic model of PG decomposition under reductive conditions by considering the effect of CO partial pressure on the reaction scheme and kinetics. The tests performed with a thermogravimetric analyzer (TGA) at several CO partial pressures and a thermodynamic study indicate that PG decomposition produces CaS and CaO as parallel reactions, while the selectivity towards each of the products depends on the temperature and CO partial pressure. As part of the kinetic study, the kinetics triplet of CaS and CaO production were individually estimated. The activation energy for each reaction, CaS and CaO production, was defined as 259.0 and 140.3 kJ/mol, respectively. The overall kinetic model of PG decomposition with CO reveals that both diffusion and interface reaction (reaction on the surface and adsorption) are equally controlling steps. The PG reduction with CO is achieved by CO adsorption on the CaSO4 surface.
期刊介绍:
The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles.
The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management.
The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).