Iron trough castable containing 70% or above of high-aluminum aggregates

Abstract

The invention belongs to the field of unshaped refractory materials and in particular relates to an iron trough castable containing 70% or above of high-aluminum aggregates. The iron trough castable comprises the components in percentage by mass: 70-74% of high-aluminum aggregates, 2-3% of spherical asphalt, 1.6-2% of calcium aluminate cement, 5.5-7.5% of alumina micropowder, 2.5-3.5% of compositesilicon dioxide micropowder, 12-13% of composite silicon carbide powder, 1-1.2% of composite antioxidant, 0-0.1% of anti-explosion fibers and 0.12-0.2% of dispersant. By combining with a plurality ofimprovement means, the addition amount of the high-aluminum aggregates can be effectively increased (the addition amount can reach 70% or above), and the water addition amount used when the castableis prepared is reduced; and proved by actual industrial applications, the use effect of the iron trough castable in a non-impact region of a main trough reaches the use effect of a common corundum iron trough castable, so that the production cost of the iron trough castable and the whole contracting cost of an iron trough can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of unshaped refractory materials, and in particular relates to an iron ditch castable containing more than 70% of high-alumina aggregate. Background technique [0002] The blast furnace casthouse is an important part of the ironmaking process, and it is also an important link for steel companies to reduce costs and increase efficiency. The fierce market competition has caused the overall contracting price of the iron trench to drop again and again, and the supplier is almost in a state of zero profit. Especially in the past two years, with the rise of refractory raw materials, many suppliers have begun to lose money. How to reduce the cost of raw materials on the premise of ensuring safe use has become one of the primary survival conditions for various iron trench contracting enterprises. It is an important choice for suppliers to replace expensive corundum aggregates and silicon carbide aggregates in castables with ...

AI Technical Summary

Problems solved by technology

[0003] However, although there are a small number of domestic reports of using high-alumina aggregates instead of corundum for iron trench castables, it is difficult to exceed 50% due to the impact of high-alumina raw material properties.

Especially when the high-alumina particles below 3mm replace corundum, the amount of water added to the castable will increase greatly, which will seriously affect the compactness and high-temperature performance of the castable, which is the bottleneck restricting the proportion of high-alumina aggregate added

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