Analysis of rare earth elements in coal fly ash using laser ablation inductively coupled plasma mass spectrometry and scanning electron microscopy

Thompson, Robert L.; Bank, Tracy L.; Montross, Scott; Roth, Elliot A.; Howard, Bret H.; Verba, Circe; Granite, Evan J.

doi:10.1016/j.sab.2018.02.009

Cited by 45 publications

(42 citation statements)

References 31 publications

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“…This characteristic along with the low concentration and dispersed nature of REEs have caused difficulties in characterizing the modes of occurrence of REEs in fly ash using traditional approaches. However, many recent studies have addressed this challenge using advanced characterization tools, such as X-ray Absorption Near Edge Structure (XANES), micro-X-Ray Absorption Near Edge Structure (µ-XANES), laser ablation inductively coupled plasma mass spectroscopy (LA-ICP-MS), multimodal image analysis, and sensitive high resolution ion microprobe-reverse geometry SHRIMP-RG [65][66][67][68][69][70]. In addition, systematic SEM-EDX, TEM-EDX, and sequential chemical extraction (SCE) studies have been performed on coal combustion ashes, which also provided valuable information regarding the REE occurrence modes and potential processing routes [71][72][73][74][75][76][77][78].…”

Section: Modes Of Occurrence Of Rees In Coal Combustion Ashmentioning

confidence: 99%

A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials

et al. 2020

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Many studies have been published in recent years focusing on the recovery of rare earth elements (REEs) from coal-related materials, including coal, coal refuse, coal mine drainage, and coal combustion byproducts particularly fly ash. The scientific basis and technology development have been supported by coal geologists and extractive metallurgists, and through these efforts, the concept has progressed from feasibility assessment to pilot-scale production over the last five years. Physical beneficiation, acid leaching, ion-exchange leaching, bio-leaching, thermal treatment, alkali treatment, solvent extraction, and other recovery technologies have been evaluated with varying degrees of success depending on the feedstock properties. In general, physical beneficiation can be a suitable low-cost option for preliminary upgrading; however, most studies showed exceedingly low recovery values unless ultrafine grinding was first performed. This finding is largely attributed to the combination of small RE-bearing mineral particle size and complex REE mineralogy in coal-based resources. Alternatively, direct chemical extraction by acid was able to produce moderate recovery values, and the inclusion of leaching additives, alkaline pretreatment, and/or thermal pretreatment considerably improved the process performance. The studies reviewed in this article revealed two major pilot plants where these processes have been successfully deployed along with suitable solution purification technologies to continuously produce high-grade mixed rare earth products (as high as +95%) from coal-based resources. This article presents a systematic review of the recovery methods, testing outcomes, and separation mechanisms that are involved in REE extraction from coal-related materials. The most recent findings regarding the modes of occurrence of REEs in coal-related materials are also included.

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Section: Modes Of Occurrence Of Rees In Coal Combustion Ashmentioning

confidence: 99%

A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials

et al. 2020

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“…Over 70% of coal combustion residues (fly ash, bottom ash, boiler slug, and solid flue-gas desulfurization residues) contain CFA, captured by electrostatic precipitators (particulate collection equipment of flue emissions) [52], and bottom ash from the hoppers under the economizers and air preheaters of large pulverized coal boilers [53]. CFA is the most massive lightweight ash particulates, ranging from 0.5 to 300 μm dominantly spherical in shape-solid or hollow (cenospheres) [54,55]. The major parameters affecting the characteristics of CFAs are phase-mineral and chemical composition of parent coal and coal combustion conditions in pulverized CFPSs (boiler temperature and its configuration, particulate control equipment, and size of feed coal) [56].…”

Section: Coal Fly Ashmentioning

confidence: 99%

“…The major industries that use REEs are catalysis, metallurgy, ceramics and polishing industry. On the other hand, the wide application is focused on catalysts, high technology products, health care devices, and rechargeable batteries [55].…”

Section: Coal Fly Ashmentioning

confidence: 99%

Solid Green Biodiesel Catalysts Derived from Coal Fly Ash

Stanković¹,

Pavlović²,

Marinković³

et al. 2020

Renewable Energy - Resources, Challenges and Applications

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Coal fly ash (CFA) is generated during the combustion of coal for energy production. Many studies are based on its utilization as the most abundant, cheap aluminosilicate industrial residue, which is recognized as a risk for the environment and human health. The present review is focused on CFA origin, chemical properties, and its catalytic application for biodiesel production. The aluminosilicate nature and the presence of rare earth elements make CFA suitable for different adsorption, catalytic, and extraction processes for obtaining valuable products including alternative fuels and pure elements. However, the presence of toxic elements is a potential environmental problem, which should be solved in order to avoid soil, water, and air pollution. The most used modification methods are alkali activation, hydrothermal, and thermal treatment that improve the structural, morphological, and textural properties. The active catalytic form could be obtained by impregnation or ion exchange method. It was found that such synthesized materials have significant catalytic potential in the biofuel chemistry. In the case of biodiesel production, the high values of conversion or yield can be achieved under mild low-energy reaction conditions in the presence of low-cost waste-based catalysts.

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“…Основополагающим фактором для проведения таких работ является определение химического состава золы. Для определения примесных компонентов угольных зол обычно используют спектрометрию с индуктивно связанной плазмой, причем методы подготовки пробы, используемые в работах, можно разделить на три группы: микроволновое разложение [1][2][3][4][5], экстракция [6][7][8] и лазерная абляция [9][10][11][12][13][14][15][16]. Проведение последнего варианта подготовки анализируемых проб не требует использования трудоемких длительных процедур, что в свою очередь, приводит к уменьшению ошибок анализа, связанных с потерями материала, и препятствует загрязнению анализируемых проб.…”

Section: Introductionunclassified

“…Например, анализируемые таблетки получают при давлениях от 10 МПа [10] до 624 МПа [16], без какого-либо объяснения. Авторы других работ (например, [12,14]) используют сплавление с боратами лития для получения плавней, которые подвергают лазерной обработке, но это делает определение содержания бора и лития в образце совершенно невозможным. Кроме того, такой метод требует наличия платиновой посуды, высокотемпературного оборудования и редких и дорогостоящих реактивов высокой чистоты.…”

Section: Introductionunclassified

The Influence of Density of Fly Ash and Binder Pellets on the Analytical Signals of Some Elements During Emission Spectral Analysis With Inductively Coupled Plasma and Laser Sampling

Kolmykov¹,

Petrushina²

2019

VKSTU

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Работа посвящена определению химического состава угольных зол (УЗ). Этот показатель является очень важным так как во многом определяет возможность переработки данного материала и степень его вредного воздействия на окружающую среду. В качестве метода исследования использована оптикоэмиссионная спектрометрия с индуктивно связанной плазмой и лазерной абляцией (ОЭС ИСП ЛА). Целью данной работы является определение возможного влияния плотности компактных материалов, полученных из зол углей и связующего агента, на качество аналитических сигналов определяемых элементов: Ba,

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Analysis of rare earth elements in coal fly ash using laser ablation inductively coupled plasma mass spectrometry and scanning electron microscopy

Cited by 45 publications

References 31 publications

A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials

A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials

Solid Green Biodiesel Catalysts Derived from Coal Fly Ash

The Influence of Density of Fly Ash and Binder Pellets on the Analytical Signals of Some Elements During Emission Spectral Analysis With Inductively Coupled Plasma and Laser Sampling

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