Light-weight corundum-spinel castable and preparation method thereof

Abstract

The invention relates to a light-weight corundum-spinel castable and a preparation method thereof. The preparation method includes following steps: (A) employing 60-75 wt% of equal-diameter micro-porous corundum spheres as an aggregate, and employing 8-12 wt% of electric-fused white corundum fine powder, 2-8 wt% of electric-fused magnesite fine powder, 2-8 wt% of magnesium aluminate spinel fine powder, 6-12 wt% of [alpha]-Al2O3 micro powder, 0.5-2.5 wt% of chromium oxide powder and 3-7 wt% of an aluminum silicone gel powder as substrate materials, wherein the aggregate and the substrate materials form a raw material in total; (B) employing organic fibers accounting for 0.02-0.08 wt% of the raw material and a polycarboxylate water reducer accounting for 0.05-0.12 wt% of the raw material as additive materials, pre-mixing the substrate material with the additive materials and adding the aggregate with uniform mixing; (C) adding water accounting for 3-5 wt% of the raw material, stirring the mixture and performing cast moulding; and (D) maintaining the temperature at 110-200 DEG C for 12-48 h, roasting the moulded product at 800-1200 DEG C for 24-72 h to obtain the light-weight corundum-spinel castable. The light-weight corundum-spinel castable is low in apparent porosity, is low in volume density, is low in heat conductivity, is strong in anti-slag-erosion capability and is long in service life.

Description

technical field [0001] The invention belongs to the technical field of unshaped refractory materials. In particular, it relates to a lightweight corundum-spinel castable and a preparation method thereof. Background technique [0002] With the development of out-of-furnace refining and continuous casting technology, the steel ladle has gradually changed from the original single-function molten steel container to the out-of-furnace molten steel refining equipment with complex functions. Getting harsher. Corundum-spinel castable is a new variety developed in recent years. It has been widely used due to its good high temperature performance, and has been popularized in Japan and other countries. With the technical progress of refractory materials and the improvement of steelmaking process requirements for refractory materials, corundum-spinel castables have been used in parts with harsh conditions in ladles, such as ladle bottom impact areas, RH pipes, breathable brick systems...

AI Technical Summary

Problems solved by technology

[0003] There are two main problems in the current use of ladle lining materials: (1) The thermal conductivity of the lining material is high, resulting in a rapid drop in the temperature of molten steel, which is not conducive to the smooth progress of continuous casting production and has a greater impact on the quality of molten steel , and increased energy consumption; (2) The thermal spalling resistance and slag resistance of lining materials are not excellent enough, especially the slag resistance performance of lining materials varies greatly under different smelting conditions such as slag systems and steel types

Especially for lightweight refractory materials, due to their lower bulk density, more pores, and more diffusion channels for slag, the slag erosion process is more complicated.

This requires lightweight refractory materials to have more micropores and the ability to form a slag-resistant protective layer under a wider range of slag composition conditions, but the currently disclosed lightweight refractory materials are still difficult to meet the requirements