Directly combined magnesia alumina spinel carbon brick and its preparing process

Abstract

The invention discloses a magnesium aluminate spinel carbon brick capable of direct recombination and process for preparation, wherein the brick comprises the raw materials of aluminium, magnesite, magnesium-aluminium milled powder, graphite, and bonding agent. By adopting the unique one-shot forming manufacturing technique, the invention changes the conventional process, wherein no heat treatment procedures are needed after press forming, thus facilitating environmental protection and substantially shortening period of production. The invention can be widely applied to thermal engineering equipment such as refined-smelting ladle furnace.

Description

Technical field: [0001] The invention relates to a carbon-containing refractory material, in particular to a directly compounded magnesium-aluminum spinel carbon brick. Background technique: [0002] The existing production process of magnesia-alumina-spinel carbon bricks is as follows: the products are molded and pressurized, dried naturally for 24 hours, or dried at 40-60°C for 8 hours, and then enter the drying kiln. It is baked at 300°C for 72-76 hours, and due to uneven heating or cooling of various parts, the reaction is not sufficient and thorough, which affects the structure and performance of the finished product. At the same time, it is necessary to add magnesium aluminum spinel when mixing raw materials In order to increase the spinel content of the product, this technology not only has high production cost and complicated process, but also increases the thermal expansion and residual expansion of the product after heating, the decrease of thermal shock resistance...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a direct composite magnesia-alumina-spinel carbon brick, which effectively solves the shortcomings of traditional magnesia-alumina-spinel carbon bricks with poor thermal shock resistance and has good Anti-erosion, anti-slag corrosion performance, good thermal shock stability, low thermal conductivity, this invention selects high-quality magnesia, aluminum material, natural flake graphite and compound organic binder, adopts unique production process to form at one time, utilizes smelting Temperature sintering, good overall performance, completely changed the traditional production process, no heat treatment and other processes are needed after pressing and forming, which is not only beneficial to environmental protection, but also can greatly shorten the production cycle, save energy, work efficiency, and reduce production costs. At the same time, its unique production process makes it unnecessary to add magnesia-aluminum spinel, and the raw materials are directly compounded through a special process, and magnesia-alumina spinel is naturally generated by using the smelting temperature, and the amount of spinel produced increases with the change of smelting temperature This technology can greatly reduce the production cost and increase the service life of the product, and has significant economic and social benefits. It can be widely used in thermal equipment such as ladles and refining furnaces, and is widely applicable.