Sequential Extraction Procedure for Elemental Speciation in Jordanian Oil Shale Ash

IF 0.8 4区工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY

Solid Fuel Chemistry Pub Date : 2024-11-06 DOI:10.3103/S0361521924700393

Salah H. Aljbour, Heba Al-Rowad, Nabeel A. Jarrah

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Abstract

This study investigates the mineralogical composition and elemental distribution of oil shale and its ash from Sultani deposits using X-ray diffraction (XRD) and X-ray fluorescence (XRF) analyses, respectively. The XRD analysis of the oil shale samples confirmed the presence of calcite and quartz as primary mineral phases. However, XRD analysis of the oil shale ash revealed the presence of gypsum in addition to calcite and quartz, suggesting thermal decomposition and mineral transformation during combustion. The Sequential solvent extraction procedure provides insights into the distribution of heavy metals within Sultani oil shale ash. Specifically, the water-soluble fraction (stage 1) exhibited the presence of readily mobile metals, notably sulfur and silicon. In the exchangeable fraction (stage 2), metals were identified as bound to particle surfaces and acid-soluble salts, with notable concentrations of calcium, iron, and other trace elements observed. Manganese oxide and organically bound metals emerged in the easily reduced fraction (stage 3), while metals associated with oxidizable minerals were predominant in the oxidizable fraction (stage 4). Additionally, the non-mobile fraction (stage 5) entrapped metals within mineral crystal lattices, indicating limited mobility.

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约旦油页岩灰中元素种类的顺序萃取程序

本研究分别采用 X 射线衍射 (XRD) 和 X 射线荧光 (XRF) 分析方法，研究了苏尔坦尼矿床油页岩及其灰烬的矿物组成和元素分布。油页岩样本的 X 射线衍射分析证实了方解石和石英作为主要矿物相的存在。然而，油页岩灰烬的 XRD 分析表明，除了方解石和石英，还存在石膏，这表明燃烧过程中存在热分解和矿物转化。顺序溶剂萃取程序有助于深入了解苏尔坦尼油页岩灰中重金属的分布情况。具体地说，水溶性部分（第 1 阶段）显示了易移动金属的存在，尤其是硫和硅。在可交换部分（第 2 阶段）中，金属被确定为与颗粒表面和酸溶盐结合，并观察到明显的钙、铁和其他微量元素浓度。氧化锰和有机结合金属出现在易还原部分（第 3 阶段），而与可氧化矿物相关的金属则主要出现在可氧化部分（第 4 阶段）。此外，非流动部分（阶段 5）将金属夹在矿物晶格中，表明流动性有限。

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来源期刊

Solid Fuel Chemistry CHEMISTRY, MULTIDISCIPLINARY-ENERGY & FUELS

CiteScore

1.10

自引率

28.60%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal publishes theoretical and applied articles on the chemistry and physics of solid fuels and carbonaceous materials. It addresses the composition, structure, and properties of solid fuels. The aim of the published articles is to demonstrate how novel discoveries, developments, and theories may be used in improved analysis and design of new types of fuels, chemicals, and by-products. The journal is particularly concerned with technological aspects of various chemical conversion processes and includes papers related to geochemistry, petrology and systematization of fossil fuels, their beneficiation and preparation for processing, the processes themselves, and the ultimate recovery of the liquid or gaseous end products.