Silica sol combined magnesium tundish prefabricated member and manufacturing method thereof

Abstract

The invention discloses a silica sol combined magnesium tundish prefabricated member and a manufacturing method thereof. The manufacturing method for the silica sol combined magnesium tundish prefabricated member comprises seven working procedures of raw material preparation, material matching, material mixing, forming, maintaining, baking and packaging. The manufacturing method has the advantages that as the SiO2 in the binding agent silica sol is uniform distributed in the prefabricated member to form a dense and uniform structure, most of all, the tundish prefabricated member has very strong steel slag corrosion resistance performance and molten steel washing resistance performance in the using process as well as excellent thermal shock resistance performance and can meet the sequential casting requirement of more furnace times.

Description

technical field [0001] The invention relates to a magnesia tundish prefabricated part and a manufacturing method thereof, in particular to a silica sol-bonded magnesia tundish prefabricated part (including impact plate, flow stabilizer, slag retaining wall, slag retaining weir / dam) and its The manufacturing method belongs to the technical field of continuous casting tundish technology in the iron and steel metallurgical industry. Background technique [0002] With the rapid development of iron and steel smelting technology and the continuous improvement of the quality requirements of casting slabs, the continuous casting tundish no longer has the functions of storage and diversion, but is a secondary refining container. In order to improve the flow field of molten steel, reduce the dead zone, prolong the residence time of molten steel in the tundish, achieve uniform molten steel temperature, promote the floating of non-metallic inclusions, and improve the quality of molten s...

AI Technical Summary

Problems solved by technology

Although some beneficial effects have been achieved, they are not satisfactory

The drying strength of sodium hexametaphosphate combined with magnesium prefabricated parts is low, and it is difficult to handle, and it will form low-melting material at high temperature, which is not resistant to molten steel erosion; although calcium aluminate cement combined with magnesium prefabricated parts has higher drying strength, However, low-melts will still be formed at high temperatures; although hydrated alumina combined with magnesium preforms has high drying strength and will not form low-melts at high temperatures, the volume expansion is too large at medium and high temperatures, making it difficult to sinter; Although the micro-powder combined magnesium preform has high drying strength, no low-melting material will be formed at high temperature, and the volume stability is also good, but due to the uneven structure and low medium-temperature strength, it is still difficult to meet the requirements of continuous casting for higher furnaces. need