微观性能对烧结矿低温还原粉化的影响

doi:10.13228 /j.boyuan.issn0449-749x.20170611

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Abstract In order to study the pressure difference and stability of BF are quite different when using two kinds of sinter with the same chemical composition，. After the two kinds of sinter were sprayed with calcium chloride solution，RDI were carried out. It is found that calcium chloride solution has no effect on A sinter，but it can significantly reduce the RDI of B sinter. Further，the difference of microstructure of two sinter was measured by real density detector，optical microscope，image analysis and nanomechanical test system. Sinter A has high porosity，fine grain，low phase hardness and poor strength. After calcium chloride was sprayed，some interfaces were isolated at the initial stage of reduction process. With the reaction interface expanding rapidly，the low structure strength of the sinter is difficult to resist the reducing stress. Thus，the RDI was not improved. After the sinter B was sprayed by calcium chloride solution，a protective film can be formed to isolate the gas solid reaction. Because sinter B has low porosity，coarse grain，small reaction interface，high phase hardness and high strength，it can well resist the reducing stress. Spraying different amounts of CaCl2 solution can reduce the RDI by 10.00%-27.25%. The results show that microstructure is one of the important factors for the difference of RDI.

Received: 19 December 2017 Published: 24 August 2018

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	Articles by authors
	LI Jian
	MAO Xiao-Meng
	PENG Xin

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LI Jian,MAO Xiao-Meng,PENG Xin. Effect of micro-characteristics on reduction degradation index of sinter[J]. Iron and Steel, 2018, 53(8): 15-20.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228 /j.boyuan.issn0449-749x.20170611 OR http://www.chinamet.cn/Jweb_gt/EN/Y2018/V53/I8/15

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