Refractory material lining body for steel ladle and preparation method of refractory material lining body

Abstract

The invention discloses a refractory material lining body for a steel ladle and a preparation method of the refractory material lining body. The refractory material lining body comprises a working lining and a permanent lining. The working lining is located on the inner side of the permanent lining, the working lining is made of a heavy calcium hexaluminate material to be used for resisting the high temperature, and the permanent lining adopts a medium-heavy or light calcium hexaluminate material to be used for conducting heat preservation and thermal insulation. The working lining and the permanent lining can be manufactured by adopting the methods of in-situ casting, a prefabricated member or a refractory brick. According to the refractory material lining body for the steel ladle, the problem that the steel ladle refractory material causes impurities in molten steel can be solved, no impurity can be led into the molten steel in the using process, meanwhile the impurities in steel canbe captured, and the molten steel can be purified and the quality is improved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a refractory lining for a ladle and a preparation method thereof. Background technique [0002] Ladle is a very important thermal equipment in the iron and steel metallurgy process, which mainly plays the role of receiving, transporting, refining and pouring molten steel. Due to the special working environment of the ladle, it is necessary to design the refractory lining of the ladle. Ladle refractory lining is generally divided into three parts: working lining, safety lining and thermal insulation lining. The working lining is generally alumina-magnesia-carbon bricks, magnesia-carbon bricks, corundum-spinel castables (prefabricated parts), corundum-based aluminum-magnesium castables (prefabricated parts), etc., which are resistant to slag and molten steel erosion. The safety lining usually adopts clay bricks, medium-heavy ordinary low-cement castables,...

AI Technical Summary

Problems solved by technology

[0006] 2. Among lightweight thermal insulation materials, especially nano-sheets and fiberboards, although the thermal insulation performance is better, crystallization, strength reduction or pulverization will occur at a slightly higher temperature, resulting in structural damage, which will make the work The supporting force of the lining and safety lining is reduced, resulting in red envelopes or steel leakage, which is also one of the factors that cause the most accidents in steel mills

[0007] 3. The safety of the heavy permanent lining (safety lining) material is relatively good, and it can resist the erosion of high-temperature slag and molten steel to ensure the safety of the ladle, but the thermal conductivity is relatively high and the heat loss is large; while the medium and heavy materials , although the heat insulation performance is good, but in the case of damage to the working lining, it cannot resist the erosion of high-temperature slag, and it is easy to cause accidents such as steel breakout

[0009] Calcium hexaaluminate is a material with a magnetoplumbite structure and has a lamellar structure; the thermal conductivity between the lamellar structures is very low, which is also the main feature and advantage of calcium hexaaluminate materials. Although it has a high density, However, the thermal conductivity is very low; this property is very important for the safety and thermal insulation performance of the ladle

[0010] The lamellar structure endows the calcium hexaaluminate material with very good thermal insulation properties, but it also makes it difficult to sinter the calcium hexaaluminate material, so it is difficult to prepare a bulk density higher than 2.8g / cm 3 Calcium hexaaluminate materials above