A kind of refractory castable for blast furnace tapping trough swing launder and preparation method thereof

Abstract

The invention relates to a refractory castable for a blast furnace tapping trough swing launder and a preparation method thereof. The technical scheme includes: taking 50-55wt% of high-purity magnesia particles and 10-13wt% of magnesium-aluminum spinel particles as the aggregate, using 7-9wt% of used MgO-C brick fine powder, 9-11wt% of the fused magnesia fine powder, 13-18wt% of Cr7C3 micro-powder and 1-4wt% of zirconia micro-powder as the matrix material, according to the content of the aggregate and the matrix material, firstly mixing the matrix material evenly, then adding the evenly mixed matrix material into the aggregate and mixing the substances evenly, then additionally adding aluminum sol accounting for 10-12wt% of the sum of the matrix material and the aggregate, stirring the substances evenly, carrying out vibration molding and room temperature curing, and performing heat preservation at 90-110DEG C for 12-24h, thus obtaining the refractory castable for the blast furnace tapping trough swing launder. The method provided by the invention has the characteristics of low cost and simple process. The prepared refractory castable for the blast furnace tapping trough swing launder has the advantages of low heat conductivity coefficient, large high temperature bending strength, good thermal shock resistance and high iron influx.

Description

technical field [0001] The invention belongs to the technical field of refractory castables for swing launders. In particular, it relates to a refractory castable for a swing launder of a blast furnace tapping trough and a preparation method thereof. Background technique [0002] The blast furnace tapping trough is an important path for molten iron to flow into the mixed iron car (or torpedo tank). There is a swing launder at the end of the tapping trough, its main function is to adjust the flow direction of the molten iron, so that the molten iron flows to any mixed iron car (or torpedo tank) on the casthouse platform to ensure the continuity of the tapping process. [0003] Similar to the tapping trough, the refractory material for the swing launder must withstand the erosion of molten iron and the erosion of slag during the entire tapping process; in addition, the swing launder is intermittently operated, and strict requirements are put forward for the thermal shock resi...

AI Technical Summary

Problems solved by technology

However, "corundum-mullite castables" often use calcium aluminate cement as the binder, because the introduction of CaO is easy to combine with the Al in the system 2 o 3 -SiO 2 The formation of low-melting phases (such as anorthite phase) reduces the high-temperature strength of "corundum-mullite castables"

[0007] In addition, the cost of refractory raw materials such as corundum, SiC and mullite is relatively high, which increases the development cost of refractory castables for swing launders of blast furnace tapping channels