Explosion-proof iron runner castable

Abstract

The invention relates to an explosion-proof iron runner castable which comprises the following raw materials in percentage by weight: 55-80 percent of fusion tabular corundum, 10-30 percent of silicon carbide, 1-5 percent of soft clay, 2-5 percent of pure calcium aluminate cement, 1-7 percent of submicron powder, 0.5-1.5 percent of explosion-proof agent and 0.05-0.15 percent of water reducing agent, wherein the explosion-proof agent is a mixture of aluminum powder, aluminum lactate, explosion-proof fiber and boron carbide powder with the weight ratio of 1-2:2.5-4:1-2.5:2-4. The castable of the invention has no cracks after demoulding and drying and no spalling during baking, has the safe explosion-proof temperature of 800 DEG C increased from 500 DEG C, can be subjected to construction under heat state and rapid temperature rise without spalling and can meet the operating requirements of rapid construction of middle and small size blast furnace iron runner. The castable has long service life, can improve the environment of a casting house, greatly reduces the labor intensity of the workers, improves the quality of molten iron and enhances the application safety factor of the iron runner.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to an explosion-proof iron ditch castable. Background technique [0002] In recent years, some changes have taken place in the production practice of blast furnaces. The use of fine materials, the expansion of furnace capacity, the increase of molten iron temperature, and the increase of furnace top pressure have accelerated the tapping cycle, increased the amount of iron and slag, and prolonged the tapping time. The flow rate of molten iron increases, making the use conditions of trench lining materials more severe. According to statistics, in the unit consumption of molten iron refractory materials, the casthouse (iron channel material and gun mud) accounts for about 71%. The sum of the construction and maintenance costs of the tapping channel and the price of gun mud during the first generation of the blast furnace is higher than the cost of building a new blast furnace and i...

AI Technical Summary

Problems solved by technology

This material can meet the requirements of blast furnace tapping without baking or rapid baking, but its bulk density is relatively low, its compressive strength is relatively low, its erosion resistance is poor, its erosion resistance is even worse, and it is frequently maintained and labor-intensive. (Frequent repairs are not only labor-intensive, but also increase a lot of danger), and do not meet environmental protection requirements (asphalt, resin will emit yellow smoke) and other shortcomings are also obvious

Large-scale iron trough castables can prolong the life of the iron trough, but cannot meet the construction requirements

Although the non-baking iron trough ramming material can meet the construction requirements, it cannot make the iron trough achieve a longer life

Images