Metallic composite low carbon magnesium carbon brick for ladle slag wire and manufacture method thereof

Abstract

The invention discloses a metal complex low-carbon magnesia carbon brick used for ladle slag lines, the weight percentage of the added materials is as following, 50 to 70 percent of magnesia particles, 25 to 35 percent of magnesia powder, and 3 to 6 percent of organic binder, furthermore, the following components are added which are produced by mixing, striating materials, forming and heat-treatment, 0 to 4 percent of flake graphite, 3 to 15 percent of metal powder, and 0.5 to 3 percent of antioxidant containing boron. The antioxidant properties, slag-resistance performance, high temperature strength and the thermal shock resistance of the ladle slag line used metal complex low-carbon magnesia carbon brick are greatly improved, the service life is prolonged, the consumption cost of each ton of refractories is lowered. The preparation method of ladle slag line used metal complex low-carbon magnesia carbon bricks is also disclosed, and the carbon content in the ladle slag line used metal complex low-carbon magnesia carbon bricks produced by the method is less than or equal to 6 percent, little carbon is added so as to reduce the pollution towards liquid steel, and residual strength ratio of the thermal shock resistance is kept at 70 to 80 percent.

Description

1. Technical field

[0001] The invention relates to a shaped product characterized by low-carbon components, in particular to a magnesia-carbon brick for a ladle slag line in the field of steelmaking. 2. Background technology

[0002] Entering the 21st century, the structure of iron and steel enterprises has been adjusted, and high-quality steel has become the leading product of large-scale enterprises, such as: the proportion of high-quality alloy steel, ultra-low carbon steel, clean steel, high-strength steel, etc. It is required to strictly control the carbon content in the refractory material to reduce the carbon increase of the molten steel, and the increase and decrease of the molten steel temperature in the secondary refining should be small, and the thermal conductivity of the ladle lining should be low, which leads to the use conditions of the ladle. It is more harsh and the working environment is more severe. There is an urgent need for the emergence of low-carbon m...