Little is known of the influence of fluxes on the nature and the intensity of burning in coal-waste heaps. To gain some insight, two siderite samples, one each from coal-mining waste heaps in Upper- and Lower Silesian Coal Basins (Poland), were heated under identical conditions in a thermal chamber coupled to a powder X-ray diffractometer. Differences in the behaviour of siderite phase and the products of its decomposition, mainly magnetite, wüstite, and olivine, are discussed. The waste heaps sampled underwent self-heating and self-ignition catalysed by fluxes. Though the samples are unlikely to be truly representative of the Silesian basins, the heterogeneous behaviour they displayed on heating merits description and explanation, as siderite is an important widely known flux in pyrometamorphic processes.

中文翻译：

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煤渣火中拟真变形实验中菱铁矿的行为：波兰上下西里西亚案例

几乎没有人知道通量对煤堆的性质和燃烧强度的影响。为了获得一些见识，在与粉末X射线衍射仪相连的热室中，在相同条件下加热了两个菱铁矿样品，每个样品分别来自上西里西亚煤田和下西里西亚煤田（波兰）的采煤废物堆。讨论了菱铁矿相及其分解产物（主要是磁铁矿，纤锌矿和橄榄石）的行为差异。采样的废物堆受到助熔剂的自热和自燃。尽管样品不可能真正代表西里西亚盆地，但它们在加热过程中表现出的异质性值得描述和解释，因为菱铁矿是在亚晶形过程中众所周知的重要通量。