국내 순환유동층보일러(Circulating fluidized bed combustion) 석탄재의 희토류 농축
Enrichment of Rare Earth Elements Contained in Coal Ashes from Korea Circulating Fluidized Bed Combustion (CFBC)
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초록
국내 순환유동층보일러형 발전소 석탄재의 주요 광물 및 희토류의 이동특성을 분석하여 석탄재 중 희토류 성분의 농축 가능성 검토를위해 체 분리 및 침출을 통한 주요 광물의 분리 및 제거에 따른 희토류 성분의 이동특성을 평가하였다. 석탄재의 주요 광물로는 경석고, 자철석 및 석영으로 확인되었으며, 세계 석탄재 희토류 평균값(404 ppm)의 30% 수준 함량으로 확인되었다(실험대상: 123 ppm). 석탄재에포함된 희토류 성분 중 90% 이상은 주로 자철석과 함께 이동하는 특성을 보였고, 10% 이하의 성분이 석영과 함께 이동하는 것으로 확인되었다. 이는 발전소 연소 방식 차이에 따라 발생된 석탄재 특성에 따른 영향으로 판단된다. 이에 국내 순환유동층보일러 석탄재로부터희토류 성분 농축을 위해서는 자철석 분리가 필요하며, 이와 관련된 선별 기술 개발 및 확보가 요구된다고 판단된다.
Abstract
Enrichment possibilities for recovering rare earth elements contained in coal bottom ash generated from domestic circulating fluidized bed combustion (CFBC) were identified. The transport characteristics of the REEs according to the separation and removal of major minerals were evaluated using sieving and leaching process. The main minerals of bottom ash were identified as anhydrite, magnetite, and quartz, and this was confirmed as a 30% of REE content of the world's average coal ash REE value (404 ppm) as a result of the difference in the combustion characteristics of power plants (REE contents in starting material: 123 ppm). More than 90% of the REEs contained in the bottom ash were found to move mainly with magnetite, and less than 10% of the components were found to move with the quartz. Therefore, In order to recover rare earth elements from coal bottom ashes generated from CFBC boiler, it is necessary to select the main rare elements such as magnetite and develop a pretreatment and concentration process.
참고문헌 (27)
- Dushyantha, N., "The story of rare earth elements(REEs) : Occurrences, global distribution, genesis, geology, mineralogy and global production", Ore Geology Reviews, 122, pp.1~17 (2020)
- 이만승, "稀土類鑛石의 製鍊 및 分離 技術", 자원리싸이클링, 19(6), pp.27~35 (2010), 한국자원리싸이클링학회
- Zhou, B., "Global potential of rare earth resources and rare earth demand from clean technologies", minerals, 7(11), pp.203~ (2017)
- Zhang, W., "Association characteristics study and preliminary recovery investigation of rare earth elements from fire clay seam coal middlings", Fuel, 215, pp.551~560 (2018)
- Honaker, R. Q., "Acid leaching of rare earth elements from coal and coal ash : implications for using fluidized bed combustion to assist in the recovery of critical materials", Energy and Fuel, 33, pp.5971~5980 (2019)
- 김유동, "희토류 자원과 이용 현황", 자원환경지질, 43(5), pp.505~516 (2010), 대한자원환경지질학회
- Seredin, V. V., "Coal deposits as potential alternative sources for lanthanides and yttrium", Int. J. Coal. Geol., 94, pp.67~93 (2012)
- 김유정, "世界 Critical materials 管理를 위한 戰略", 자원리싸이클링, 22(5), pp.3~12 (2013), 한국자원리싸이클링학회[DOI]
- Franus, W., "Coal fly as a resource for rare earth elements", Environ Sci Pollut Res, 22, pp.9464~9474 (2015)
- Dai, S., "A review of anomalous rare earth elements and yttrium in coal", Int. J. Coal. Geol, 159, pp.82~95 (2016)
- Taggart, R. K., "Trends in the rare earth element content of U.S.-based coal combustion fly ashes", Environ. Sci, Technol, 50, pp.5919~5926 (2016)
- Folgueras, M. B., "Coal and sewage sludge ashes as sources of rare earth elements", Fuel, 192, pp.128~139 (2017)
- Blissett, R. S., "An investigation into six coal fly ashes from the United Kingdom and poland to evaluate rare element content", Fuel, 119, pp.236~239 (2014)
- Seredin, V. V., "A new method for primary evaluation of the outlook for rare earth element ores", Geol. Ore Deposits, 52(5), pp.428~433 (2010)
- Lin, R., "Enrichment of rare earth elements from coal and coal by-products by physical separations", Fuel, 200, pp.506~520 (2017)
- 박석운, "국내 석탄화력발전소 석탄회 중 희유금속 가치 평가", 자원리싸이클링, 24(4), pp.67~75 (2015), 한국자원리싸이클링학회[DOI]
- Hower, J., "Location of cerium in coal-combustion fly ashes : implications for recovery of lanthanide", Coal combustion and gasfication products, 3, pp.73~78 (2013)
- Dai, S., "Petrology, mineralogy, and chemistry of size-fractioned fly ash from the Jungar power plant, inner Mongolia, China, with emphasis in the distribution of rare earth elements", Energy and Fuel, 28, pp.1502~1514 (2014)
- Pan, J., "Study on the modes occurrence of rare earth elements in coal fly ash by statics and and a sequential chemical extraction procedure", Fuel, 237, pp.555~565 (2019)
- Perämäki, S. E., "Occurence and recovery potential of rare earth elements in finish peat and biomass combustion fly ash", Journal of geochemical exploration, 201, pp.71~78 (2019)
- 장정국, "순환유동층 석탄재의 활용 기술과 광산 채움재 관련 규격 동향", 자원리싸이클링, 26(2), pp.71~79 (2017), 한국자원리싸이클링학회[DOI]
- Zeng, T., "Iron transformations during combustion of Pittsburgh no. 8 coal", Fuel, 88, pp.566~572 (2009)
- Moore, F., "Mineralogy and geochemistry of the coals from the karmodz and kiasar coal mines", International journal of coal geology, 96-97, pp.9~21 (2012)
- Yang, J., "Physicalchemical characteristics and elements enrichment of magnetospheres from coal fly ashes", Fuel, 135, pp.15~26 (2014)
- Kolker, A., "Distribution of rare earth elements in coal combustion fly ash, determined by SHRIMP-RG ion microprobe", International journal of coal geology, 184, pp.1~10 (2017)
- Bock, E., "On the solubility of anhydrous calcium sulphate and of gypsum in concentrated solutions of sodium chloride at 25 ℃, 30 ℃, 40 ℃, and 50 ℃", Can. J. Chem, 39, pp.1746~1751 (1961)
- Salmimies, R., "Acidic dissolution of magnetite : experimental study on the effects of acidic concentration and temperature", Clay and clay minerals, 59, pp.136~146 (2011)