Clay minerals of great purity are scarce; such is the case of kaolin. Many methods currently used for its purification damage some characteristics of industrial interest of the clay mineral, and these methods are aggressive to the environment. For this reason, in this work, the purification of kaolin was carried out using the extracts of Citrus latifolia, Citrus aurantifolia, Opuntia joconostle and Allium sativum. The clay mineral was sifted to obtain a size of ≤38 μm. The liquor obtained after the dissolution of iron was characterized by atomic absorption spectroscopy. A percentage of removal of 91·43% was obtained for C. aurantifolia, 88·76% for C. latifolia, 67·84% for O. joconostle and 62·19% for A. sativum. The clay mineral was characterized before and after iron dissolution by energy-dispersive X-ray spectroscopy, scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. Plant acid extracts are a viable alternative for the removal of iron from kaolin. The obtained iron removal percentages were higher in comparison with those obtained by other methods currently in use, making this alternative simple and eco-friendly and producing no damage to the morphology of the clay. The percentages of elimination of iron obtained by this method provide acceptable kaolin for use in industries.

中文翻译：

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通过植物酸提取物提纯高岭土的新方法

纯度极高的粘土矿物质稀少。高岭土就是这种情况。当前用于其纯化的许多方法破坏了粘土矿物的工业利益的某些特征，并且这些方法对环境具有侵略性。因此，在这项工作中，使用柑桔，柑桔，刺槐和大蒜的提取物进行了高岭土的纯化。筛分粘土矿物以获得≤38μm的尺寸。铁溶解后获得的液体通过原子吸收光谱法表征。淡色梭菌的去除率为91·43％，阔叶梭菌的去除率为88·76％，褐藻的去除率为67·84％。O. joconostle和62·19％A.大蒜。通过能量色散X射线光谱，扫描电子显微镜，傅立叶变换红外光谱和X射线衍射对粘土矿物在铁溶解之前和之后进行了表征。植物酸提取物是从高岭土中去除铁的可行选择。与通过当前使用的其他方法获得的铁去除百分比相比，所获得的铁去除百分比更高，这使得该替代方法简单且生态友好，并且不会损害粘土的形态。通过该方法获得的铁消除百分比提供了可接受的工业用高岭土。