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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2023.6
- 수록면
- 49 - 59 (11page)
- DOI
- 10.5855/ENERGY.2023.32.2.049
이용수
초록· 키워드
오류제보하기
Rare earth elements (REE) are crucial for new technology; however, do not have effective substitutes and are scarce in the earth’s crust. Among secondary resources of REE, circulating fluidized bed coal fly ash has been proposed as a potential source because the REE content is increased by the combustion ocurring in the Circulating Fluidized Bed boilers (CFB). Conventional REE recovery methods from coal fly ash imply the leaching using strong acids or alkalis at high temperatures. Nevertheless, physical separation aims to separate the target minerals from the gangue using their physical properties, concentrating the minerals, and reducing the use of acids in the post-pretreatment stages. We analyzed the mineral and chemical composition of fly ash. The principal minerals contained in fly ash are unburned carbon, lime, quartz, anhydrite, and hematite. Our sample has 235.73 ppm of REE. Besides, the content of REE in unburned carbon is negligible (13.81 ppm). The 43.16 %wt. of the sample passed the 400 mesh (- 25 μm). Furthermore, the REE content is relatively similar in every fraction of CFBC fly ash, so particle size separation is not considered for our sample. However, at 0.5 T, the magentic fraction has a considerable amount of Fe₂O₃ (21.45 %wt.) and the REE content was increased to 889.20 ppm. Notwithstanding, the yield is only 15.58 %. Even though REE is attached to iron, some quartz and aluminosilicate phase contained REE. In addition, crushing or grinding could be not effective since the particle size is low. Other processes are needed for an enhancement of the REE recovery.
목차
Abstract
1. Introduction
2. Experimental section
3. Results and discussion
4. Conclusion
References
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