Slag covering agent

Abstract

The invention provides a slag covering agent which is composed of an introduction material of C and an introduction material of SiO2. The slag covering agent comprises, by weight, 40-95% of C, 5-20% of SiO2, 0-10% of Al2O3, 0-10% of CaO, 0-10% of MgO, 0-1.0% of water and 0-15% of impurities. The introduction material of C is one or two of blast furnace gas dust with the content of C being above 5%, gangue, carbonized rice hulls, pulverized coal and coke powder. The introduction material of SiO2 is one or two of pulverized coal with the content of SiO2 being above 10%, heating furnace waste sand, cast waste sand and carbonized rice hulls. The volume density of the slag covering agent is 0.55-2.90 g / cm<3>. The slag covering agent can effectively prevent the slag surface from crusting, direct outward heat dissipation of the slag surface is reduced, the slag outflow rate and the productivity are increased, the stability of slag surface components is guaranteed, and interference to target slag components and the subsequent product performance is avoided. Meanwhile, the operation time for subsequent temperature increase can be shortened, energy consumption can be lowered, and use cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of high-temperature slag treatment, and in particular relates to a slag covering agent with heat preservation function. Background technique [0002] At present, the tundish generally used by domestic and foreign metallurgical enterprises is mainly used for continuous casting or discontinuous casting of molten metal. The tundish used to contain liquid slag to directly produce products is rare, and its technical requirements are quite different from those of casting and continuous casting metal tundishes. When the slag is transported through the tundish, due to the small specific heat capacity of the slag, the cooling speed is fast, and the surface quickly crusts. Transfer to the next process. If the slag needs to be used to directly produce products, it needs to be equipped with heating facilities to perform operations such as breaking the shell and heating the slag to meet the requirements of the next proc...

AI Technical Summary

Problems solved by technology

This type of tundish covering agent has relatively good thermal insulation performance, but its main purpose is to improve the thermal insulation performance and anti-pollution ability of molten steel in the tundish, and it is also not suitable for online thermal insulation of molten slag.

[0005] Therefore, there are few related technologies of slag covering agent in the prior art, and there are problems such as poor thermal insulation performance, high energy consumption, low operating rate, and high use cost in practical applications.