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Study on Fluoride-free Mold Flux of Thin Slab Continuous Casting

Author: QiuBin
Tutor: YuanShouQian；ZhangQiYe
School: Xi'an University of Architecture and Technology
Course: Iron and steel metallurgy
Keywords: Thin slab casting CFC - free protective slag Melting temperature Melting rate Viscosity
CLC: TF777
Type: Master's thesis
Year: 2009
Downloads: 103
Quote: 0
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Abstract


In the continuous casting process, the mold powder for continuous casting anterograde and improve the quality of slab surface plays a very important role, but the presence of fluorinated mold fluxes in addition to involving global environmental problems, but also the continuous casting and a continuous casting machine equipment also have adverse effects. With the national emphasis on environmental issues and the emergence of green metallurgy, research Fluorine slag has a very important significance. This paper focuses on the thin slab casting conditions CFC-free protective slag, focusing on its melting temperature, melting rate and viscosity. OF chemically pure reagents design method using single factor test to determine the orthogonal experiment to protect the preferred content range of each of the chemical constituents of the slag: the magnesium oxide content of 7% to 11%; lithium oxide content of 0.5% ~ 3.0% ; sodium oxide content of 6% to 10%; boron oxide content of 3% to 7%; barium oxide content of 6% to 10%. By orthogonal range analysis and variance analysis to study the chemical composition on the degree of influence of the protective slag resistance. In range analysis result, 1) the protective slag hemisphere point melting temperature impact strength of cis sequence B 2 O 3 > Li , 2 O> R> MgO> BaO> Na 2 O; 2) the fluxes melting speed of solid carbonaceous material (not added) affect the strength of the cis-sequence R> Na 2 O> MgO> Li 2 O> B 2 O 3 > BaO; 3) the protection of slag viscosity (1300 ° C) affect the strength of the cis-sequence Li 2 O> R> B 2 O 3 > BaO> Na 2 O> MgO. The results of the analysis of variance, 1) the strength of the melting temperature of the affected the protective slag hemisphere point Shun sequence, the Li 2 O> B 2 O3> MgO> R> Bao > Na 2 O; 2) Li 2 O, B 2 O 3 , BaO, Na 2 O, MgO in the raw carbonaceous material situation under the melting rate of the slag is very small; 3) the strength of the protection of slag viscosity (1300 ° C) cis sequence, the Li 2 O> B 2 O 3 > R> BaO> MgO> Na 2 O. Range analysis and analysis of variance results are basically consistent. Range analysis and variance analysis, slag melting temperature and viscosity suitable as a basis for slag, testing to determine the right with the carbon content of the carbonaceous material is added to the mixed form of carbon black and graphite, carbon black and graphite the relationship between the carbon black: graphite = 1:3; total carbon content of 3%, the obtained fluorine-free protective slag, the melting temperature of 1076 ° C; melting rate 23.5s; viscosity of 0.089Pa.s (1300 ° C ). In this paper, cement clinker, magnesia, industrial barium carbonate, industrial borax, spodumene, industrial soda, industrial lime, quartz sand, graphite, carbon black powder, the test proceeds industrial raw materials pre-melting Fluorine slag, the melting temperature of 1079 ℃, the viscosity 0.094Pa.s (1300 ° C) and the melting rate 26.3s, have been met the requirements of the thin slab continuous casting mold fluxes, while adapting steel models for low-carbon steel. Fluorine slag in laboratory research and development, the development of green metallurgy and industrial Fluorine slag production practical significance, and to provide some guidance and reference of the actual design and production of CFC-free thin slab continuous casting mold fluxes.

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