湿法磁选对粉煤灰中铁和重金属元素的分布影响研究

doi:10.19964/j.issn.1006-4990.2023-0289

Abstract

Abstract:

A wet magnetic separation process was used for pulverized coal boiler fly ash（FA1 ash） and circulating fluidized bed boiler fly ash（FA2 ash） to reduce their heavy metal content.Scanning electron microscope，laser particle sizer and X-ray diffractometer were used to characterize the morphology，particle size distribution and physical phase analysis of the highly magnetic and weakly magnetic parts of the two types of fly ash before and after magnetic separation under the conditions of different magnetic induction strengths and different concentrations of magnetic separation solutions，and to determine the changes in the contents of iron and five heavy metal elements（Hg，Pb，As，Cr，Cd）.It was found that the iron recovery rate of the two types of fly ash after magnetic separation was increased gradually with the increase of magnetic induction strength，and the content of heavy metal elements in the high magnetic group was significantly different from that in the weak magnetic group.The results showed that the Fe recovery of FA1 was 71.2% and that of FA2 was 47.0% at the magnetic induction intensity of 8 000 Gs and the magnetic separation solution concentration of 20%.At this time，the difference of Pb content，Cr content and As content after magnetic separation of FA1 was 0.2 mg/kg，9.2 mg/kg and 1.1 mg/kg，respectively.The difference of Pb content，Cr content and As content after magnetic separation of FA2 was 18.1 mg/kg，25.0 mg/kg and 9.1 mg/kg，respectively.

Key words: magnetic separation, fly ash, heavy metal elements, circulating fluidized bed

CLC Number:

TQ138.11

LI Kuai, LI Zhaoshuai, DONG Tingxuan, LI Dan, GUO Shengwei, HAN Fenglan. Study on effect of wet magnetic separation on distribution of Fe and heavy metal in fly ash[J]. Inorganic Chemicals Industry, 2024, 56(4): 98-104.

Figures/Tables 12

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References 21

1	LUO Yang， WU Yinghong， MA Shuhua， et al. Utilization of coal fly ash in China：A mini-review on challenges and future directions［J］. Environmental Science and Pollution Research， 2021， 28（15）：18727-18740. doi: 10.1007/s11356-020-08864-4
2	张祥成，孟永彪. 浅析中国粉煤灰的综合利用现状［J］. 无机盐工业， 2020， 52（2）：1-5.
	ZHANG Xiangcheng， MENG Yongbiao. Brief analysis on present situation of comprehensive utilization of fly ash in China［J］. Inorganic Chemicals Industry， 2020， 52（2）：1-5.
3	冯文丽，吕学斌，熊健，等. 粉煤灰高附加值利用研究进展［J］. 无机盐工业， 2021， 53（4）：25-31.
	FENG Wenli， Xuebin LÜ， XIONG Jian， et al. Research progress of high added value utilization of coal fly ash［J］. Inorganic Chemicals Industry， 2021， 53（4）：25-31.
4	STRZAŁKOWSKA E. Morphology，chemical and mineralogical composition of magnetic fraction of coal fly ash［J］. International Journal of Coal Geology， 2021， 240：103746. doi: 10.1016/j.coal.2021.103746
5	VALEEV D， KUNILOVA I， ALPATOV A， et al. Magnetite and carbon extraction from coal fly ash using magnetic separation and flotation methods［J］. Minerals， 2019， 9（5）：320. doi: 10.3390/min9050320
6	LIU Huidong， SUN Qi， WANG Baodong， et al. Morphology and composition of microspheres in fly ash from the Luohuang power plant，Chongqing，southwestern China［J］. Minerals， 2016， 6（2）：30. doi: 10.3390/min6020030
7	MA Yongbo， DU Xueyan， SHEN Yingying， et al. Crystallization and beneficiation of magnetite for iron recycling from nickel slags by oxidation-magnetic separation［J］. Metals， 2017， 7（8）：321. doi: 10.3390/met7080321
8	WANG Guxia， LI Zhaoshuai， YAN Jun， et al. Value-added utilization of coal fly ash in polymeric composite decking boards［J］. Journal of Materials Research and Technology， 2023， 23：4199-4210. doi: 10.1016/j.jmrt.2023.02.026
9	刘大锐，许立军，李世春，等. 粉煤灰中战略金属锂的回收研究进展［J］. 无机盐工业， 2023， 55（1）：56-63.
	LIU Darui， XU Lijun， LI Shichun， et al. Research progress of recovery of strategic metal lithium from fly ash［J］. Inorganic Chemicals Industry， 2023， 55（1）：56-63.
10	郑彬，蒋亮，韩凤兰，等. 铜渣复合硅锰水淬渣后的改质提铁研究［J］. 无机盐工业， 2023， 55（1）：136-143.
	ZHENG Bin， JIANG Liang， HAN Fenglan， et al. Study on reformation and extracting iron of copper slag and silicon-manganese water quenched slag composites［J］. Inorganic Chemicals Industry， 2023， 55（1）：136-143.
11	LU S G， CHEN Y Y， SHAN H D， et al. Mineralogy and heavy metal leachability of magnetic fractions separated from some Chinese coal fly ashes［J］. Journal of Hazardous Materials， 2009，
	169 （ 1/ 2/3）：246-255.
12	PETRUS H T B M， OLVIANAS M， SUPRAPTA W， et al. Cenospheres characterization from Indonesian coal-fired power plant fly ash and their potential utilization［J］. Journal of Environmental Chemical Engineering， 2020， 8（5）：104116. doi: 10.1016/j.jece.2020.104116
13	KUKIER U， ISHAK C F， SUMNER M E， et al. Composition and element solubility of magnetic and non-magnetic fly ash fractio--ns［J］. Environmental Pollution， 2003， 123（2）：255-266. doi: 10.1016/S0269-7491(02)00376-7
14	ROSITA W， BENDIYASA I M， PERDANA I， et al. Sequential particle-size and magnetic separation for enrichment of rare-earth elements and yttrium in Indonesia coal fly ash［J］. Journal of Environmental Chemical Engineering， 2020， 8（1）：103575. doi: 10.1016/j.jece.2019.103575
15	NI Peng， LI Hailong， ZHAO Yongchun， et al. Relation between leaching characteristics of heavy metals and physical properties of fly ashes from typical municipal solid waste incinerators［J］. Environmental Technology， 2017， 38（17）：2105-2118. doi: 10.1080/09593330.2016.1246612
16	LANZERSTORFER C. Fly ash from coal combustion：Dependen-ce of the concentration of various elements on the particle size［J］. Fuel， 2018， 228：263-271. doi: 10.1016/j.fuel.2018.04.136
17	BAKALÁR T， PAVOLOVÁ H， HAJDUOVÁ Z， et al. Metal recovery from municipal solid waste incineration fly ash as a tool of circular economy［J］. Journal of Cleaner Production， 2021， 302：126977. doi: 10.1016/j.jclepro.2021.126977
18	LIU Fuli， MA Shuhua， REN Kun， et al. Mineralogical phase separation and leaching characteristics of typical toxic elements in Chinese lignite fly ash［J］. Science of the Total Environment， 2020， 708：135095. doi: 10.1016/j.scitotenv.2019.135095
19	韩大捷，马淑花，王晓辉，等. 硝酸脱除褐煤粉煤灰中的砷［J］. 过程工程学报， 2018， 18（4）：716-721. doi: 10.12034/j.issn.1009-606X.217365
	HAN Dajie， MA Shuhua， WANG Xiaohui， et al. Removal of arsenic in lignite fly ash by nitric acid［J］. The Chinese Journal of Process Engineering， 2018， 18（4）：716-721. doi: 10.12034/j.issn.1009-606X.217365
20	WEI Yunmei， MEI Xiaoxia， SHI Dezhi， et al. Separation and characterization of magnetic fractions from waste-to-energy bottom ash with an emphasis on the leachability of heavy metals［J］. Environmental Science and Pollution Research， 2017， 24（17）：14970-14979. doi: 10.1007/s11356-017-9145-8
21	王尚杰夫，金会心，雷二帅，等. 赤泥、粉煤灰和磷石膏配碳碱性调控共烧结回收铁铝［J］. 中国冶金， 2023， 33（4）：119-126.
	WANG Shangjiefu， JIN Huixin， LEI Ershuai， et al. Recovery of iron and aluminum from red mud，fly ash and phosphogypsum by co-sintering under alkaline control of carbon addition［J］. China Metallurgy， 2023， 33（4）：119-126.

粉煤灰	主要化学成分质量分数
粉煤灰	SiO₂	Al₂O₃	CaO	Fe₂O₃	MgO	K₂O	Na₂O	其他
FA1	42.36	30.04	4.58	4.26	1.23	0.74	0.65	16.14
FA2	42.31	31.60	3.95	5.24	0.86	0.78	0.27	14.99

粉煤灰	含量
粉煤灰	Hg	Pb	As	Cr	Cd
FA1	0.224	68.4	13.5	68.4	<0.6
FA2	0.572	56.0	7.38	32.0	0.57

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Study on effect of wet magnetic separation on distribution of Fe and heavy metal in fly ash

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