循环流化床粉煤灰与煤粉炉粉煤灰磁选除铁差异性研究

王小芳; 高建明; 郭彦霞; 程芳琴

doi:10.13205/j.hjgc.202003025

循环流化床粉煤灰与煤粉炉粉煤灰磁选除铁差异性研究

doi: 10.13205/j.hjgc.202003025

山西大学资源与环境工程研究所, 国家环境保护煤炭废弃物资源化高效利用技术重点实验室, 太原 030006

基金项目:

国家重点研发计划项目（2017YFB0603101）；襄垣县固废综合利用科技攻关项目（2018XYSDJS-04）。

详细信息

作者简介:
王小芳(1995-),女,硕士研究生,主要研究方向为煤基固废资源化利用。1145489363@qq.com

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出版历程
- 收稿日期: 2019-06-26

DIFFERENCE OF IRON REMOVAL EFFICIENCIES FROM CIRCULATING FLUIDIZED BED FLY ASH AND PULVERIZED COAL FLY ASH BY MAGNETIC SEPARATION

State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006, China

摘要

摘要: 粉煤灰中氧化铁是其高值化利用过程的主要杂质，高效去除铁杂质对于粉煤灰高值利用具有重要意义。采用湿法磁选方法对循环流化床粉煤灰（CFB灰）、碳热还原循环流化床粉煤灰（R-CFB灰）及煤粉炉粉煤灰（PC灰）进行除铁研究，并对不同类型粉煤灰中铁的存在形式进行对比，最后对粉煤灰中铁的去除和铝的回收进行了考察。结果表明：CFB灰直接磁选铁的去除率仅为17.6%，PC灰直接磁选铁的去除率可达到55.8%，这与CFB中的铁主要以赤铁矿形式存在，而PC灰中的铁主要以磁铁矿形式存在有关；经碳热还原后CFB灰中的铁由赤铁矿转变为磁铁矿，在磁场强度为400 mT，磁选3次，液固比为20：1的条件下，R-CFB灰的除铁率为64.7%，，铁含量从3.4%降低到1.2%，且铝的回收率为78.6%。与PC灰磁选法除铁效果对比，经碳热还原的CFB灰可达到较高的除铁率。
- 循环流化床粉煤灰 /
- 煤粉炉粉煤灰 /
- 磁选 /
- 赤铁矿 /
- 磁铁矿
Abstract: Iron oxide in fly ash is the main impurity for its high value utilization process. Efficient removal of iron impurities is of great significance for the high value utilization of fly ash. In this paper, the wet magnetic separation method was used to remove iron from circulating fluidized bed fly ash (CFB ash), carbonthermal reduction circulating fluidized bed fly ash (R-CFB ash) and pulverized coal furnace fly ash (PC ash). Research and comparison of the existence forms of iron in different types of fly ash were studied and compared, and finally the removal of iron and recovery of aluminum in fly ash were examined. The results showed that the iron removal efficiency of CFB ash using direct magnetic separation method was only 17.6%, and the iron removal efficiency of PC ash using direct magnetic separation method could reach 55.8%. The iron in CFB mainly existed in the form of hematite, while iron was mainly related to the existence of magnetite in PC ash. The hematite in CFB ash was converted to magnetite after carbonthermal reduction, and the iron removal of R-CFB ash was 64.7%, with a magnetic field strength of 400 mT, magnetic separation 3 times and liquid-solid ratio of 20:1. The iron content was reduced from 3.4% to 1.2%, and the recovery of aluminum was 78.6%. Compared with the iron removal of PC ash, the carbonthermal reduction CFB ash could achieve higher iron removal efficiency.
- circulating fluidized bed fly ash /
- pulverized coal fly ash /
- magnetic separation /
- hematite /
- magnetite

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参考文献(24)

LI J, ZHUANG X G, LEIVA C, et al. Potential utilization of FGD gypsum and fly ash from a Chinese power plant for manufacturing fire-resistant panels[J]. Construction and Building Materials, 2015, 95:910-921.

FARWA M, MUHAMMAD Z, IJAZ A B, et al. Possible applications of coal fly ash in wastewater treatment[J]. Journal of Environmental Management, 2019, 240:27-46.

YAO Z T, XIA M S, SARKER P K, et al. A review of the alumina recovery from coal fly ash, with a focus in China[J]. Fuel, 2014, 120:74-85.

DING J, MA S H, SHEN S, et al. Research and industrialization progress of recovering alumina from fly ash:a concise review[J]. Waste Management, 2016,60:375-387.

李超, 王丽萍, 郭昭华,等. 粉煤灰中锂提取技术研究进展[J]. 有色金属(冶炼部分), 2018(4):46-50.

王凯,孙菱翎,邱广明,等. 粉煤灰基沸石的制备及对橙黄G吸附性能研究[J]. 功能材料, 2019, 50(2):2133-2138.

熊林. 粉煤灰基多孔陶瓷材料的研制[D]. 长沙:中南大学, 2008.

刘自亮. 粉煤灰制备铝硅合金过程中预处理除铁工艺研究[D]. 昆明:昆明理工大学, 2016.

李素平. Fe₂O₃和TiO₂等杂质在矾土基Sialon转型过程中的变化及作用[D]. 郑州:郑州大学, 2004.

SEIDEL A, ZIMMELS Y. Mechanism and kinetics of aluminum and iron leaching from coal fly ash by sulfuric acid[J]. Chemical Engineering Science, 1998, 53(22):3835-3852.

郭强. 粉煤灰酸法提取氧化铝的工艺研究进展[J]. 洁净煤技术, 2015, 21(5):115-118

,122.

MOLINA A, POOLE C. A comparative study using two methods to produce zeolites from fly ash[J]. Minerals Engineering, 2004, 17(2):167-173.

WANG M H, ZHAO H, LIU Y, et al. Removal of Fe from fly ash by carbon thermal reduction[J]. Microporous and Mesoporous Materials, 2017, 245:133-137.

孙少博, 张永锋, 崔景东,等. 粉煤灰高值化利用中的除铁工艺[J]. 化工新型材料, 2015,43(1):223-225.

KUTCHKO B G, KIM A G. Fly ash characterization by SEM-EDS[J]. Fuel, 2006, 85(17/18):2537-2544.

王恩. 煤粉炉粉煤灰与循环流化床粉煤灰矿物学性质比较[J]. 洁净煤技术, 2016, 22(4):26-29.

刘芳, 顾国维, 韩作振. 锅炉类型与粉煤灰的物相特征[J]. 同济大学学报(自然科学版), 2003, 31(8):990-994.

VASSILEV S V, MENENDEZ R, ALVAREZ D, et al. Phase-mineral and chemical composition of coal fly ashes as a basis for their multicomponent utilization. 1. Characterization of feed coals and fly ashes[J]. Fuel, 2003, 82(14):1793-1811.

WANG T, YANG H R, WU Y X, et al. Experimental study on the effects of chemical and mineral components on the attrition characteristics of coal ashes for fluidized bed boilers[J]. Energy & Fuels, 2012, 26(2):990-994.

裴亚利. 循环流化床粉煤灰的特征及其综合利用研究[D]. 长春:吉林大学, 2006.

李解, 李保卫, 张邦文. Fe₂O₃转变为Fe₃O₄粉末的微波碳热还原[J]. 北京科技大学学报, 2011, 33(9):1127-1132.

UWADIALE G G O O, WHEWELL R J. Effect of temperature on magnetizing reduction of agbaja iron ore[J]. Metallurgical Transactions B, 1988, 19(5):731-735.

MENDRELA E, OSADNIK Z, STASZAK J, et al. High capacity magnetic separator for volatile dust[J]. IEEE Transactions on Magnetics, 1983, 19(3):1476-1479.

宫振宇, 王明华, 王凤栾,等. 磁选法去除粉煤灰中磁性铁的研究[J]. 材料与冶金学报, 2011, 10(4):257-259.

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