工业副产石膏热分解脱硫的研究进展

Advance of the thermal decomposition of industrial by-product gypsum

热分解工业副产石膏回收利用SO_2和固体剩余物是一种有效资源化利用工业副产石膏的方式,但普遍存在利用成本高、能耗高、效率低等缺点,严重限制其循环利用的发展。本文介绍了近年来热分解工业副产石膏的研究进展。从气氛条件、还原剂与CaSO_4的配比、添加剂或杂质的促进作用,加热温度等方面回顾了不同条件对工业副产石膏分解率和脱硫率的影响,对比研究了微波加热相对于常规加热还原分解工业副产石膏的优势,分析了不同反应条件下CaSO_4与C/CO的反应机理模型。同时对工业副产石膏热分解的发展方向和趋势进行了展望。通过优化反应条件能够有效提高工业副产石膏的热分解效率和脱硫率,但成本依旧较高。指出微波加热分解工业副产石膏可能成为未来工业化的一个重要方向。

Thermal decomposition of industrial by-product gypsum is one of the most effective ways to recycle SO2 and the corresponding solid residues. The high cost,high energy-consuming,and low efficiency,seriously limit the reutilization of industrial by-product gypsum. This paper reviewed the recent advances on the research of thermal decomposition of industrial by-product gypsum. Based on the influence of atmospheric conditions,the ratio of reductant to CaSO4,the facilitation of addictive or impurity,and heating temperatures,the decomposition and desulfurization degree were analyzed. The advantages of microwave heating method were highlighted compared to conventional heating,and the decomposition mechanisms of CaSO4 with C/CO were also summarized under different conditions. The research trend for thermal decomposition of industrial by-product gypsum in the future was discussed as well. The decomposition and desulfurization degree of industrial by-product gypsum can be effectively improved by optimizing reaction condition to reduce the high cost. The results showed that microwave assisted heating desulphurization of industrial by-product gypsum will be a promising direction for industry in the future.