升温速率与预熔过程对含氟渣熔点影响分析

doi:10.13228/j.boyuan.issn0449-749x.20190414

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Abstract In order to explore the effect of heating rate and pre-melting on melting point and reveal the volatility characteristics of fluorine-containing slag at high temperature,a combined experiment of hemispherical melting point detection and thermogravimetry(TG)was taken. The melting point and volatilization characteristics of the fluorine-containing slag system were investigated under different heating rates and pre-melting processes. The results showed that the weight loss rate of fluorine-containing slag was 5%-17% during the melting point determination and it increased with the heating rate decreasing. There was almost no influence on the melting point of the fluorine-free slag before and after pre-melting,and for the fluorine-containing slag,the difference between the melting point of the mixed and the pre-melted slag was nearly 70 ℃. The reason for the difference was not the change of the phase composition,but the mixed slag had obvious volatilization. When is reached,the weight loss of the mixed slag was 8.3% at the melting point and that of the pre-melted slag was only 2%. There was a large amount of free CaF₂ in the mixed slag sample,and for the pre-melted slag,CaF₂ was mostly in the form of calcium fluoroaluminate and cuspidine. It provided a theoretical basis for exploring the effect of volatilization on high-temperature properties such as the melting point of fluorine-containing slag.

Key words： CaF₂ fluorine-containing slag melting point volatilization model

Received: 06 September 2019

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	Articles by authors
	ZHAO Zhong-yu
	ZHAO Jun-xue
	TAN Ze-xin
	QU Bo-qiao
	LU Liang
	CUI Ya-ru

Cite this article:

ZHAO Zhong-yu,ZHAO Jun-xue,TAN Ze-xin等. Effect of heating rate and pre-melting process on melting point of fluorine-containing slag[J]. Iron and Steel, 2020, 55(6): 123-128.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190414 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I6/123

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