磷石膏还原分解过程的热力学模拟

针对高硫煤还原分解磷石膏的反应复杂性,采用FactSage 6.1计算软件对其化学热力学平衡反应进行计算,并与相同条件下的磷石膏分解反应试验结果进行了比较.结果表明高硫煤还原分解磷石膏的主要产物为CaO,CaS,SO2等.综合分析表明温度是影响高硫煤还原分解磷石膏产物组成及含量的重要因素且在1 100℃时分解效果较好,可作为最佳温度的选择标准.计算结果虽与试验结果在确定组分含量上存有一定差异但产物组成及变化趋势相近,表明化学热力学平衡分析方法可作为磷石膏分解反应特性研究的指导性手段.

Chemical Thermodynamic Analysis for the Decomposition Reaction of Phosphogypsum

Chemical thermodynamic equilibrium calculation,which adopts FactSage6.1 calculation software,was carried out for the decomposition characteristics of phosphogypsum at reducing agent of high-sulfur coal and its results were compared with those experiments of phosphogypsum decomposition which was proceed at the same conditions.The results of calculation and experiment showed the products of phosphogypsum decomposition are CaO,CaS,SO2,and so on.All analyses indicated reaction temperature was an important influence factor and the optimal temperature was 1 100 ℃.Calculated phases basically agree with the results of decomposition products which achieved by experiment.But component concentration has definite difference between analog computation with experimental results.This means that chemical thermodynamic equilibrium analysis could provide effective information and guidance to study the decomposition characteristics of phosphogypsum.