碱度变化对电炉渣含铁组分回收率的影响规律

doi:10.13228/j.boyuan.issn0449-749x.20160404

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Abstract Compared with BOF slag，EAF slag has larger amount of higher-temperature waste heat lower recovery rate of iron components，but there is no suitable treatment method for EAF slag at present. In the current study， EAF slag was disposed by hot modification method with sands as modifier，and the effects of EAF slag basicity on recovery rate of iron components were studied using XRD and SEM-EDS methods to study the change of mineral phase and structure. Results showed that hot slag modification is a new method for EAF slag to not only utilize its waste heat，but also improve its cementitious properties and recover more iron components. When the basicity of modified EAF slag decreased to 1.6，Ca2Fe2O5 （the presence of ferric iron） and RO （the presence of divalent iron） reduced and even disappeared，cementitious mineral，Ca2SiO4 and some strong magnetic phase （such as MgFe2O4，Fe3O4， and FeCr2O4） generated and increased gradually，which would contributed to the improvement of its cementitious properties and recovery rate of iron components. When basicity of modified slag was 1.3，the total amount of magnetic phase and recovery rate of iron components reached a maximum of 69.71% and its iron grade increased by 43.74%. When the basicity of modified slag was less than 1.3，Fe3O4 gradually transformed to weak magnetic phase （such as aluminum spinel），and the recovery rate of iron components thereby decreased.

Received: 05 September 2016 Published: 18 April 2017

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	Articles by authors
	MA Shuai
	LI Yu
	ZHANG Ling-Ling
	LV Xiang
	CANG Tai-Jiang

Cite this article:

MA Shuai,LI Yu,ZHANG Ling-Ling等. Effects of EAF slag basicity on its recovery rate of iron components[J]. Iron and Steel, 2017, 52(4): 78-83.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20160404 OR http://www.chinamet.cn/Jweb_gt/EN/Y2017/V52/I4/78

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