Refractory castable for tundish cover

Abstract

The invention discloses a refractory castable for a tundish cover. The refractory castable is prepared from the following components in parts by weight: 50-80 parts of magnesia, 5-20 parts of dolomite, 5-10 parts of zircon, 1-20 parts of carbon, 2-5 parts of water-free binder and 0.2-1 part of urotropine. The magnesia, the dolomite and the zircon are mixed to prepare particles and fine powder, wherein the part number of the particles is 35-55, the part number of the fine powder is 45-65, the particle size of the particles ranges from 3.0 to 2.0mm, the particle size of the fine powder is 2.0-0.5mm. The refractory castable has excellent thermal shock resistance and breakage and peel resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a refractory castable for a tundish cover. Background technique [0002] Compared with qualitative refractory products, unshaped refractory materials represented by refractory castables have the advantages of short process flow, low production energy consumption and cost, convenient use, wide application range, integrity and good use effect, so they are widely used in the world. It has developed rapidly, and its proportion in the whole refractory material is getting higher and higher. In some countries with advanced refractory technology, the output of unshaped refractories has approached or even exceeded the output of shaped products. For example, the current output of unshaped refractory materials in Japan accounts for about 60% of the total refractory materials; in the United States, it is about 50%; in Britain, Germany, France and other countries, it...

AI Technical Summary

Problems solved by technology

As we all know, calcium-magnesia refractory materials have gradually been widely used in the steelmaking industry because of their environmental protection and ability to clean molten steel. However, the problem of easy hydration of calcium oxide has not been well resolved, which restricts its Depth and breadth of application

[0005] Calcium-containing refractory materials commonly used at present-the calcium-magnesia sand without surface waterproof treatment can be stored naturally without hydration for more than 100 days; Calcium-magnesia bricks prepared from treated calcium-magnesia sand not only need to use anhydrous or liquid binder with as little water content as possible, but also the produced calcium-magnesia bricks must be treated with oil or wax before being stored in vacuum packaging. No hydration for 180 days; it not only increases the cost of the product, but also brings a lot of trouble to the storage, transportation and use of the product