【摘要】 研究了醋酸溶液调质对石灰石在O2/CO2气氛下煅烧/硫化特性的影响,并结合氮吸附法、压汞法和XRD技术进行了分析。结果表明,与原石灰石相比,调质石灰石在煅烧/硫化过程中表现出更高的钙转化率,XRD图谱及其相定量分析证明了这一点;随温度升高,调质石灰石具有最佳的硫化温度,此温度下其钙转化率最高;随SO2浓度增大,初始阶段煅烧/硫化反应速率升高,调质石灰石钙转化率增大;随醋酸浓度增大,调质石灰石的钙转化率提高,提高幅度因石灰石种类而异;氮吸附及压汞分析表明调质石灰石较未调质石灰石具有发达的孔结构,促进了硫化反应的进行。更多还原

【Abstract】 The effect of the modification by acetic acid solution on calcination/sulphation performance of limestone was investigated at O2/CO2 atmosphere.The calcination product was characterised by means of BET method and mercury intrusion methods.The phase composition of sulphation product was analyzed quantitatively by XRD.The results show that the conversion is much higher for sulphation of modified limestone(ML) than for that of original one,which is confirmed by XRD phase quantitative analysis.There exists an optimum temperature in which the conversion of ML sulphation is the maximum.With increase of SO2 concentration the reaction rate goes up at the initial stage and conversion of ML sulphation also increases.With increasing acetic acid concentration the conversion also raises but the extent of the increase is various for different limestone.The modification by acetic acid solution leads to the development of macropore structure of limestone,which is favorable for its sulphation.更多还原