Low-carbon magnesia carbon bricks and preparation method thereof

The invention relates to low-carbon magnesia carbon bricks and a preparation method thereof. According to the technical scheme, the method for preparing the low-carbon magnesia carbon bricks comprises the following steps of: uniformly mixing 57 to 75 weight percent of fused magnesite granules, 18 to 32 weight percent of fused magnesite fine powder, 1 to 6 weight percent of crystalline flake graphite, 1 to 12 weight percent of additive and 1 to 4 weight percent of antioxidant which serve as raw materials, adding a phenolic resin in an amount which is 2 to 6 percent of the weight of the raw materials for mixing, compressing for forming, and drying to obtain the low-carbon magnesia carbon bricks. A method for preparing the additive comprises the following steps of: mixing and milling 20 to 78 weight percent of steelmaking wastes and 22 to 80 weight percent of aluminum-containing compound for 30 to 120 minutes by using a ball-milling machine, compressing the mixed and milled materials for forming, keeping the temperature of between 1,300 and 1,700 DEG C for 2 to 5 hours, cooling and taking out to obtain the additive. The method has the characteristics of low production cost, simple process and high industrialized degree; and the low-carbon magnesia carbon bricks produced by the method are low in coefficient of thermal expansion and high in thermal shock resistance and oxidation resistance.