电渣重熔用中氟渣配渣方式对熔点测定的影响

doi:10.13228 /j.boyuan.issn0449-749x.20180015

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Abstract The reasons of the difference in melting point measured by hemispherical method is studied for samples of slag for electroslag remelting with the same composition and different modes of slag matching，in order to further understand the characteristics of fluorine slag system during heating，melting point determination experiment and electroslag preparation process to provide reference. Hemispherical melting point measurement and thermogravimetric analysis were carried out on pre-melting slag and the slag with the same chemical composition made from chemical pure reagent. The two kinds of slag were calcined in the same condition as the melting point measurement，and the phase analysis were carried out for the calcined samples. The results showed that the average melting point difference between the two groups was about 72 ℃，and there was a significant weightloss during the heating process. The weight loss of the samples prepared by chemical pure reagent （7.79%） was significantly higher than that of the premelting slag （1.11%）. Weightloss mainly originates from the volatilization of CaF2 in the process of high temperature. Calcium fluoride volatilization caused slag composition change，resulting in phase change. Cooling sample from chemical pure agent after melting contains a large amount of cuspidine and spinel，which are high melting point materials. Cooling sample from premelting slag after melting contains a lot of melilite and two calcium aluminate，which are low melting point phases. Therefore，the main reason of the difference in melting point among slag samples with the same composition and different modes of slag matching is that the volatilization of the two groups of slag is different，leading to the difference in the chemical composition and phases，and as a result，the difference in melting point.

Received: 11 January 2018 Published: 24 August 2018

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	Articles by authors
	CHANG Na
	DIAO Jun-Hua
	DIAO Zhong-Yu
	YI Rui-Meng
	LV Liang
	YU Ze
	CUI Ya-Ru

Cite this article:

CHANG Na,DIAO Jun-Hua,DIAO Zhong-Yu等. Influence of slag preparation mode on melting point of ESR slag with medium fluoride content[J]. Iron and Steel, 2018, 53(8): 44-48.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228 /j.boyuan.issn0449-749x.20180015 OR http://www.chinamet.cn/Jweb_gt/EN/Y2018/V53/I8/44

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