Objectives

In this study, the crystalline phase, microstructure, chemical composition, and morphology of the powder of volcanic ashes from three different places have been investigated.

Methods

The raw materials were initially milled and the particle size was decreased to approximately 74 µm. X-ray diffraction (XRD), chemical analysis (XRF and ICP-OES technique), Fourier transform infrared spectroscopy and scanning electron microscopy were used to examine the obtained samples.

Results

It was found that the volcanic ashes exhibit clear variations in mineralogy, chemical compositions, stretching vibrational modes, and morphological structure. All the samples have an amorphous phase and contain SiO₂, Al₂O₃, CaO, and Fe₂O₃ as their major constituents. Other oxides such as K₂O, MgO, MnO, Na₂O, P₂O₅, TiO₂, and SO₃ were found in minor percentages. The morphology of the samples showed a variety of volcanic mixtures with irregular shapes.

Conclusions

The abundant volcanic ash can be used as a new low-cost natural material in several applications such as in construction materials, ceramic industry, water purification, geopolymers, and other advanced technologies.

中文翻译：

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不同粉状火山灰的表征及潜在应用

目标

在这项研究中，研究了来自三个不同地方的火山灰粉末的结晶相，微观结构，化学成分和形态。

方法

首先将原料进行研磨，并将粒径减小至约74 µm。用X射线衍射（XRD），化学分析（XRF和ICP-OES技术），傅里叶变换红外光谱和扫描电子显微镜检查所得样品。

结果

发现火山灰在矿物学，化学组成，拉伸振动模式和形态结构上显示出明显的变化。所有样品均具有非晶相并且包含SiO ₂，Al ₂ O ₃，CaO和Fe ₂ O ₃作为其主要成分。发现其他氧化物，例如K ₂ O，MgO，MnO，Na ₂ O，P ₂ O ₅，TiO ₂和SO _3的比例很小。样品的形态显示出各种不规则形状的火山混合物。

结论

丰富的火山灰可以在建筑材料，陶瓷工业，水净化，地质聚合物和其他先进技术等多种应用中用作低成本的新型天然材料。