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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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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