Application of sequential extraction and hydrothermal treatment for characterization and enrichment of rare earth elements from coal fly ash
By Ronghong Lin, M. Stuckman, B. Howard, T. Bank, E. Roth, Megan K. Macala, C. Lopano, Y. Soong, E. Granite. Fuel, 2018
147 citations recorded by the source corpus.
Abstract Rare earth elements (REE) play a critical role in the global economy. The concern about the REE supply challenge has stimulated global interest in recovering REE from alternative non-conventional REE sources such as coal fly ash. In this paper, sequential extraction, physical separations and hydrothermal alkaline treatment were explored for characterization and enrichment of REE from coal fly ash. Seven-step sequential extraction of coal fly ash has demonstrated that 86.1% of total REE were associated with the glassy phase of the fly ash, with the remaining REE mainly distributed in the organic and sulfides phase (8.3%), the exchangeable phase (3.7%), and the carbonates phase (1.5%). A process combining physical separations, namely, particle size separation and magnetic separation, and hydrothermal alkaline treatment was proposed for enrichment of REE from coal fly ash. The optimal hydrothermal alkaline treatment condition was determined. It was demonstrated that NaOH concentration, solid-to-liquid ratio, temperature, and reaction duration had significant influence on ash dissolution in NaOH solution. Grinding could also enhance ash dissolution during subsequent hydrothermal alkaline treatment. REE were enriched from coal fly ash from 325 mg/kg to 877 mg/kg via the proposed process under optimal hydrothermal alkaline treatment conditions.
Subfields: Building and Construction, Geochemistry and Petrology
View Paper: https://www.semanticscholar.org/paper/cc90258d641dfba6f07f1d10f3a442e933ca9383
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Building and Construction
In Geochemistry and Petrology
Citations in the corpus
- A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials (2020, methodology): “3% of the material was dissolved by using 5 M NaOH with a solid/liquid ratio of 1/20 a 100 ◦C for 120 min [76].”