Low-carbon magnesia carbon brick and preparation method thereof

Abstract

The invention relates to a low-carbon magnesia carbon brick and a preparation method thereof. The technical scheme is as follows: 78-93 wt% of magnesia particles, 0.1-2 wt% of organic additives and 5-20 wt% of absolute ethyl alcohol are placed in a stirrer, stirred for 2-6 hours at a rotating speed of 300-600 rpm, dried at 80-110 deg c for 12-24 hours, and sieved to obtain pretreated magnesia particles with a particle size of 1-5 mm. Then, 63-75 wt% of the pretreated magnesia particles, 20-32 wt% of magnesia fine powder, 2-5 wt% of flake graphite, 1-3 wt% of an antioxidant and 2-5 wt% of thermosetting phenolic resin are used as raw materials to be uniformly mixed, pressed and molded at 150-200 MPa, and then cured at 180-240 deg c for 18-24 hours to prepare the low-carbon magnesia carbon brick. The invention has the characteristics of low production cost, simple process and easy industrial production, and the prepared low-carbon magnesia carbon brick has high thermal shock stability, high high-temperature bending strength and good slag erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of magnesia-carbon bricks. In particular, it relates to a low-carbon magnesia-carbon brick and a preparation method thereof. Background technique [0002] Magnesia-carbon bricks are non-burning carbon composite refractories made of magnesia and high-melting-point carbon materials that are difficult to be infiltrated by slag as the main raw materials, adding various non-oxide additives and carbon binders. It has excellent characteristics such as high temperature resistance, strong slag resistance, high thermal shock resistance and low high temperature creep. It is mainly used in the lining of converters, AC electric arc furnaces, DC electric arc furnaces and slag lines of ladles. With the advancement of smelting technology, the requirements for refractory materials are also continuously increasing. Traditional magnesia carbon bricks have shown a series of shortcomings in long-term application practice: (1)...

AI Technical Summary

Problems solved by technology

With the advancement of smelting technology, the requirements for refractory materials are also continuously increasing. Traditional magnesia carbon bricks have shown a series of shortcomings in long-term application practice: (1) High thermal conductivity leads to large heat loss, which increases the tapping temperature and increases (2) When smelting high-quality steel or ultra-low carbon steel, it causes the problem of carbon increase; (3) Consumes a lot of graphite resources, etc.

Use suitable high-efficiency antioxidants to protect carbon materials, but the cost of antioxidants usually introduced is high, and the dispersion uniformity is not easy to control, and the corrosion resistance and high-temperature mechanical properties of materials have not been significantly improved.