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对印地安那南部Lynnville煤泥积贮地的样品进行了详细的煤岩学研究，并就煤泥的自然氧化作用进行探讨。与原煤比较，煤泥的可见矿物体积分数增加了4～5倍，由5％改变为24％，其中黄铁矿由1％变为5％。煤泥除了黄铁矿。方解石、粘土、石英等煤系煤层的原生矿物，还含有地表土壤混入物。煤泥积贮他的入口处，沉积物自然形成高出潜水面的突起，黄铁矿在此大量富集，高粘土含量的细粒成分在煤泥地的末端富集，输入带（入口150m范围内）煤泥相应具有高硫、高灰特征。作为氧化产物，少量的褐铁矿和石膏分别在镜下和通过X射线行射分析被发现。黄铁矿比有机显微组分更易氧化并经历揭铁矿化到铁质胶体出溶变化过程。石膏主要形成于煤泥输入带。相对较强的氧化作用发生在输入带的推断得到了水化学分析结果的进一步验证。尽管如此，高潜水面及滞留水有效地限制了煤泥地内氧化作用的进行。根据煤泥入注时的自然分选效应，避开输入带，可提高煤泥回收利用率。研究成果为煤炭洗选废弃物（煤泥）的回收利用与排放环境的评价监测提供了新的方法和依据。
A detailed study of coal petrology was carried out on samples from the Lynnville slime deposits in southern Indiana and the natural oxidation of slime was discussed. Compared with the raw coal, the visible mineral volume fraction of slime increased 4 to 5 times, from 5% to 24%, of which pyrite from 1% to 5%. Slime addition to pyrite. Calcite, clay, quartz and other coal-based coal seam of primary minerals, but also contain soil surface soil mixture. At the entrance to the slime accumulation, sediments form naturally above the surface of the submerged surface, and pyrite is abundantly enriched therein. The fine-grained component with high clay content is enriched at the end of the slime land. The input belt (inlet 150 m Range) Slime corresponding to high sulfur, high ash characteristics. As an oxidation product, a small amount of limonite and gypsum were found under the microscope and by X-ray emission analysis, respectively. Pyrite is more easily oxidized than organic microstructure and undergoes the process of iron ore mineralization to iron colloid dissolution. Gypsum is mainly formed in slime input belt. The relatively strong oxidation occurs at the input band inferred to be further validated by the results of the hydration analysis. In spite of this, high submersion and stagnant water effectively limit the oxidation in the slime. According to the natural sorting effect of slime input, to avoid the input belt, can increase the recovery rate of slime. The research results provide a new method and basis for the evaluation and monitoring of the recovery and utilization of coal washing waste (slime) and the emission environment.