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首页> 外文期刊>Cermica >Mineralogical characterization and beneficiation study of kaolin from Equador (RN) and Junco do Serid?3 (PB) to increase the brightness index
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Mineralogical characterization and beneficiation study of kaolin from Equador (RN) and Junco do Serid?3 (PB) to increase the brightness index

机译：Equador（RN）和Junco do Serid？3（PB）提高亮度指数的高岭土的矿物学表征和选矿研究

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Kaolin is a rock composed mainly of kaolinite. It is used in many industrial segments, such as paper and ceramics. However, for these uses it is necessary to submit the ore to appropriate beneficiation, which generally involves magnetic separation and chemical bleaching, aiming to remove iron oxide and hydroxide, raising brightness index. This work reports the mineralogical characterization and analysis of the beneficiation of three samples of kaolin, two from Equador (Rio Grande do Norte - RN) and the third from Junco do Serid?3 (Para?-ba - PB). The samples were submitted to granulometric classification in sieve of 44 ??m, magnetic separation in a magnetic induction of 14000 gauss, and chemical bleaching with sodium dithionite during 240 min. The processes were divided into two beneficiation routes. X-ray diffraction, chemical analysis by X-ray fluorescence and scanning electron microscopy were used for mineralogical characterization of the ore and measurement of the brightness index, while electron paramagnetic resonance was applied to study the variation of iron oxides and hydroxides during beneficiation. The results indicate that just 30 min of chemical bleaching without magnetic separation was sufficient to increase the brightness index from 78.2 to 90.2% and from 91.3 to 95.7% in the two samples from Equador (RN) and from 86.9 to 90.4% in the sample from Junco do Serid?3 (PB). The magnetic separation, although causing a small increase in the brightness index, was inefficient for removal of iron oxides and hydroxides. The results indicated no need for using magnetic separation in plants for beneficiation of kaolin from these two locations, providing the reduction of production costs allowing better exploitation of the ore.
机译：高岭土是主要由高岭石组成的岩石。它用于许多工业领域，例如纸张和陶瓷。但是，对于这些用途，必须对矿石进行适当的选矿，这通常涉及磁选和化学漂白，旨在去除氧化铁和氢氧化铁，从而提高亮度指数。这项工作报告了三种高岭土样品的矿物学特征和分析，其中两种来自Equador（北里奥格兰德州-RN），第三种来自Junco do Serid？3（Para？-ba-PB）。样品在44 ?? m的筛子上进行粒度分类，在14000高斯的磁感应强度下进行磁分离，并在240分钟内用连二亚硫酸钠进行化学漂白。该过程分为两个选矿路线。 X射线衍射，X射线荧光化学分析和扫描电子显微镜用于矿石的矿物学表征和亮度指数的测量，而电子顺磁共振用于研究选矿过程中铁氧化物和氢氧化物的变化。结果表明，仅进行30分钟的化学漂白而没有磁分离，足以使Equador（RN）的两个样品的亮度指数从78.2％增至90.2％，从91.3％增至95.7％，而从Equador（RN）的样品中则从86.9％增至90.4％ Junco do Serid？3（PB）。磁分离尽管会引起亮度指数的小幅增加，但对于去除氧化铁和氢氧化物而言效率不高。结果表明不需要在工厂中使用磁选来从这两个位置选矿高岭土，从而降低了生产成本，从而可以更好地开采矿石。

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