Bauxites are deposits rich in aluminium and iron oxides/hydroxides, formed by the weathering of aluminosilicates rocks under warm and humid conditions. Due to their mineralogical composition, bauxites represent the primary source for aluminum and, subordinately, iron production. However, these sediments rich in Si and Al can be also used as raw material for the synthesis of zeolite with magnetic properties thanks to the high availability of Fe. In this work, three bauxite samples collected from Upper Cretaceous deposits of southern Italy were characterized for their magnetic parameters and used for the synthesis of zeolite with LTA topology (zeolite A). The results indicate differences in antiferromagnetic behaviour among the three raw materials. All the synthetic products, instead, display the same antiferromagnetic behaviour thus suggesting that the method used for the zeolite crystallization neutralizes the parameters responsible for raw bauxite magnetic differences.

中文翻译：

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铝土矿和预熔热液产品（沸石）的磁性

铝土矿是富含铝和铁氧化物/氢氧化物的沉积物，是由铝硅酸盐岩石在温暖和潮湿的条件下风化形成的。由于其矿物成分，铝土矿是铝和铁生产的主要来源。然而，由于铁的高可用性，这些富含硅和铝的沉积物也可以用作合成具有磁性的沸石的原料。在这项工作中，对从意大利南部上白垩统矿床采集的三个铝土矿样品的磁性参数进行了表征，并用于合成具有 LTA 拓扑结构的沸石（沸石 A）。结果表明三种原材料的反铁磁行为存在差异。相反，所有合成产品都表现出相同的反铁磁行为，因此表明用于沸石结晶的方法中和了导致原铝土矿磁性差异的参数。