高温悬浮态下硫铁矿的氧化特性研究

硫铁矿的高温氧化是引起水泥生产过程中产生SO2的主要原因。采用一维炉开展了高温悬浮态下硫铁矿氧化的实验研究，并对氧化产物做了X射线衍射（XRD）分析和烧失量检测。XRD分析表明，FeS2在300 ℃时尚未发生氧化反应，从400 ℃开始出现Fe2O3的衍射峰，且随着温度升高，FeS2的衍射峰强度逐步减弱，Fe2O3衍射峰强度逐步增强。在400~800 ℃时，FeS2的氧化产物仅为Fe2O3。基于烧失量的计算表明，在10 s反应时间内，FeS2在300 ℃几乎没有发生氧化，这和XRD检测结果一致。在400 ℃和600 ℃时FeS2氧化率分别达到了50%和85%，800 ℃时达到了92%。将上述结果应用于水泥生产过程，表明在C1~C4预热器中，约64%的FeS2发生了氧化。

Research on oxidation characteristic of pyrite under hightemperature and suspension state

The oxidation of pyrite under high temperature is the main reason led to the emission of SO2 during the cement production process.A onedimensional furnace was adopted to investigate the oxidation of the pyrite under high temperature and suspension state.XRD analysis and the test of LOI on the oxidation product were made.XRD analysis showed that no oxidation reaction of the FeS2 occurred under 300 ℃，and the diffraction peak of Fe2O3 was observed from 400 ℃.With the increase of temperature，the diffraction peak intensity of FeS2 decreased，while the Fe2O3 increased significantly.Besides，the only oxidation product of FeS2 at 400~800 ℃ was Fe2O3.Based on the test results of LOI，less FeS2 went through the oxidation reaction under 300 ℃ within the 10 s reaction time 10 s，which was accordance with the XRD analysis.The oxidation rate of FeS2 under 400，600 ℃ and 800 ℃ were 50%，85% and 92% respectively.These results were further applied in the actual cement production process，and it indicated that about 64% FeS2 was oxidized during the process of C1~C4 preheaters.