CO_2对CaS氧化反应特性影响的热重研究

Research on CaS oxidation reaction with CO_2 in thermogravimetric analysis

从热力学角度分析常压下CO2气体与CaS可能的反应途径,采用热重实验研究CO2对CaS氧化特性的影响,利用红外光谱仪定量分析反应析出的气体。研究表明,CaS可以与CO2发生氧化反应,生成CaO与CaSO4,同时析出SO2与CO气体。与O2体积浓度为21%的气氛相比,在干燥空气中CaS发生氧化反应的初始反应温度降低,SO2析出量减少,固硫产物CaSO4含量增大。在CO2和O2的共同作用下,干燥空气对CaS的氧化能力稍强于O2体积浓度为21%的气体。

Potential reaction between CO2 and CaS was studied with thermodynamics. The oxidation of CaS by CO2 was investigated by a Metteler Toledo TGA instrument under no- isothermal condition and the exhausted gas was analyzed by infrared spectral method. CaS was converted to CaO and CaSO4 simultaneously with SO2 and CA） released. Contrast atmosphere of dry air with atmosphere containing 21% O2, the original temperature of oxidation of CaS brought forward, and the amount of SO2 reduced, with mass fraction of CaSO4 increasing. Dry air has stronger oxidation than atmosphere containing 21% O2 for the cooperated effect of CO2 with O2.