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Coal and Its By-products
Research Guide
What is Coal and Its By-products?
Coal and its by-products refer to coal as a geochemical resource and the materials derived from its combustion or processing, such as fly ash, which contain trace elements, heavy metals, and recoverable minerals like rare earth elements and alumina.
This field encompasses 31,053 papers on the geochemistry, utilization, and environmental impact of coal and its by-products. Key areas include trace elements in coal, fly ash characterization, rare earth elements recovery, alumina extraction, phytoremediation of coal ash sites, and heavy metal distribution. Research addresses both resource recovery and pollution mitigation from coal-derived materials.
Topic Hierarchy
Research Sub-Topics
Trace Elements in Coal Geochemistry
Researchers analyze the modes of occurrence, enrichment factors, and distribution patterns of trace elements like arsenic, selenium, and mercury in coal seams worldwide. Studies employ sequential extraction and geochemical modeling to assess mobility and environmental risks.
Fly Ash Characterization and Utilization
This sub-topic covers mineralogical, chemical, and physical properties of fly ash from coal power plants, alongside applications in concrete production and soil amendment. Researchers evaluate leaching potential and performance in construction materials.
Rare Earth Elements Recovery from Coal Byproducts
Studies focus on extraction methods, concentration levels, and economic viability of REEs in coal, fly ash, and acid mine drainage using techniques like acid leaching and ion exchange. Research assesses purity and scalability for industrial supply.
Heavy Metals Distribution in Coal and Ash
Researchers map partitioning and enrichment of heavy metals such as lead, cadmium, and chromium during coal combustion and in disposal sites. Investigations include speciation analysis and risk assessment models.
Phytoremediation of Coal Ash Disposal Sites
This area evaluates hyperaccumulator plants and microbial consortia for remediating heavy metals and radionuclides in coal ash impoundments. Field trials assess biomass yield, metal uptake efficiency, and long-term site restoration.
Why It Matters
Coal fly ash utilization supports construction and mineral recovery industries, as detailed in 'A comprehensive review on the applications of coal fly ash' by Yao et al. (2014), which covers 1638 citations on applications like cement production and alumina extraction. Rare earth elements recovery from fly ash addresses supply shortages for technologies including wind turbines and LED bulbs, per 'Rare earth elements: A review of applications, occurrence, exploration, analysis, recycling, and environmental impact' by Balaram (2019) with 1884 citations. Phytoremediation using plants removes heavy metals like As, Pb, and Hg from coal ash sites, offering a cost-effective cleanup method as reviewed by Tangahu et al. (2011) in 'A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation' (1641 citations). Biochar from coal-related biomass sorbs contaminants in soil and water, per Ahmad et al. (2013) (4244 citations).
Reading Guide
Where to Start
'Trace Elements in Soils and Plants' by Kabata-Pendias (2010), as it provides foundational knowledge on trace elements in soils affected by coal by-products, with 11676 citations serving as an entry point to geochemistry basics.
Key Papers Explained
'Trace Elements in Soils and Plants' by Kabata-Pendias (2010) establishes trace element basics in soils, which 'A comprehensive review on the applications of coal fly ash' by Yao et al. (2014) builds on for fly ash utilization. 'Rare earth elements: A review of applications, occurrence, exploration, analysis, recycling, and environmental impact' by Balaram (2019) extends this to REE recovery from fly ash. 'Biochar as a sorbent for contaminant management in soil and water: A review' by Ahmad et al. (2013) connects to remediation, while 'A review on the utilization of fly ash' by Ahmaruzzaman (2009) details broader applications.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research continues on trace element geochemistry and fly ash recovery, with highly cited reviews like Yao et al. (2014) and Balaram (2019) pointing to frontiers in REE and alumina extraction. No recent preprints available, so focus on expanding phytoremediation and biochar applications from established works like Tangahu et al. (2011) and Ahmad et al. (2013).
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Trace Elements in Soils and Plants | 2010 | — | 11.7K | ✕ |
| 2 | Biochar as a sorbent for contaminant management in soil and wa... | 2013 | Chemosphere | 4.2K | ✕ |
| 3 | Biochar for environmental management: science and technology | 2009 | Choice Reviews Online | 3.0K | ✕ |
| 4 | A review on the utilization of fly ash | 2009 | Progress in Energy and... | 2.5K | ✕ |
| 5 | Biochar physicochemical properties: pyrolysis temperature and ... | 2020 | Reviews in Environment... | 2.4K | ✓ |
| 6 | A Review of Biochar and Its Use and Function in Soil | 2010 | Advances in agronomy | 2.1K | ✕ |
| 7 | The forms of alkalis in the biochar produced from crop residue... | 2010 | Bioresource Technology | 1.9K | ✕ |
| 8 | Rare earth elements: A review of applications, occurrence, exp... | 2019 | Geoscience Frontiers | 1.9K | ✓ |
| 9 | A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants thr... | 2011 | International Journal ... | 1.6K | ✓ |
| 10 | A comprehensive review on the applications of coal fly ash | 2014 | Earth-Science Reviews | 1.6K | ✓ |
Frequently Asked Questions
What are the main applications of coal fly ash?
Coal fly ash is used in cement production, road construction, and mineral recovery such as alumina and rare earth elements. 'A comprehensive review on the applications of coal fly ash' by Yao et al. (2014) outlines these uses across construction and environmental sectors. 'A review on the utilization of fly ash' by Ahmaruzzaman (2009) details 2543 citations on energy and combustion science applications.
How does biochar function in contaminant management from coal by-products?
Biochar sorbs heavy metals and pollutants in soil and water due to its high cation exchange capacity and surface area. 'Biochar as a sorbent for contaminant management in soil and water: A review' by Ahmad et al. (2013) reviews its efficacy with 4244 citations. Properties vary with pyrolysis temperature and feedstock, as shown in 'Biochar physicochemical properties: pyrolysis temperature and feedstock kind effects' by Tomczyk et al. (2020) (2419 citations).
What trace elements are found in coal and its by-products?
Trace elements in coal include heavy metals and rare earth elements distributed in fly ash and soils. 'Trace Elements in Soils and Plants' by Kabata-Pendias (2010) covers their occurrence in the anthroposphere and pedogenic processes with 11676 citations. 'Rare earth elements: A review of applications, occurrence, exploration, analysis, recycling, and environmental impact' by Balaram (2019) details REE recovery from coal by-products (1884 citations).
How is phytoremediation applied to coal ash sites?
Phytoremediation uses plants to uptake heavy metals like As, Pb, and Hg from coal ash disposal sites. 'A Review on Heavy Metals (As, Pb, and Hg) Uptake by Plants through Phytoremediation' by Tangahu et al. (2011) describes this affordable method (1641 citations). It targets contaminated soils from coal by-products effectively.
What is the current state of rare earth elements recovery from coal by-products?
Rare earth elements are recovered from coal fly ash for use in modern technologies like wind turbines. 'Rare earth elements: A review of applications, occurrence, exploration, analysis, recycling, and environmental impact' by Balaram (2019) reviews occurrence and recycling methods (1884 citations). This addresses critical supply needs in electronics and energy sectors.
Open Research Questions
- ? How can extraction efficiency of rare earth elements from fly ash be optimized without increasing environmental heavy metal release?
- ? What plant species and soil amendments maximize phytoremediation of trace elements at coal ash disposal sites?
- ? How do pyrolysis conditions affect biochar's capacity to sorb specific heavy metals from coal-impacted waters?
- ? What geochemical models best predict trace element distribution in diverse coal deposits globally?
- ? Which processing methods yield the highest alumina recovery rates from coal fly ash while minimizing waste?
Recent Trends
The field holds steady at 31,053 papers with no reported 5-year growth rate.
Highly cited works like 'Biochar physicochemical properties: pyrolysis temperature and feedstock kind effects' by Tomczyk et al. (2419 citations) reflect ongoing focus on biochar optimization for coal-related remediation.
2020No recent preprints or news coverage indicate stable research without new surges.
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