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Oxidative desulphurization of sulphur-rich coal

机译:富硫煤的氧化脱硫

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Process of oxidative desulphurisation of sulphur-rich containing Ukrainian coal was carried out in the temperature range of 623-723 K by air/steam mixture in the fluidised bed reactor. Mossbauer spectroscopy was applied to study the reaction products in form of iron compounds after every step of thermal treatment. The pyritic sulphur that constitutes most of total sulphur oxidises selectively at these conditions. At lower temperature (623 K) the ferrous sulphates and pyrite oxidised mainly to the ferric sulphate. At 673 K and higher temperatures alpha-Fe_2O_3 and SO_2 were basic products of FeS_2 oxidation. The transformation of FeS_2 into pyrrhotite as the first stage of desulphurisation was observed at 698 K independently of the partial pressure of oxygen. The iron monosulphide (FeS) was not found at any stage of desulphurisation suggesting the pyrrhotite Fe_(1-x)S oxidation before the sequential FeS_2->Fe_(1-x)S->FeS transformation.
机译:在流化床反应器中,通过空气/蒸汽混合物在623-723 K的温度范围内对富含硫的乌克兰煤进行氧化脱硫工艺。每一步热处理后,采用Mossbauer光谱研究铁化合物形式的反应产物。在这些条件下,构成总硫磺中大部分的黄铁矿硫被选择性氧化。在较低的温度(623 K)下,硫酸亚铁和黄铁矿主要氧化成硫酸铁。在673 K和更高的温度下,α-Fe_2O_3和SO_2是FeS_2氧化的基本产物。 FeS_2脱硫的第一阶段是在698 K处转变成黄铁矿,与氧的分压无关。在脱硫的任何阶段均未发现单硫化铁(FeS),这说明黄铁矿Fe_(1-x)S的氧化先于顺序的FeS_2-> Fe_(1-x)S-> FeS转变。

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