Magnesia carbon brick

Common unshaped refractories of magnesia carbon bricks can be divided into castables, plastics, ramming materials, gunning materials, projection materials and coatings according to construction methods and material properties. Converter Magnesia Carbon Brick

Castable is a kind of granular and powdery material made of refractory material, and a certain amount of binder and moisture are added together. It has high fluidity, is suitable for construction by casting method, and is a common unshaped refractory that can be hardened without heating. It is composed of refractory aggregate, powder, binder, admixture, water or other liquid materials. Generally, it is formed by pouring, shaking or tamping at the use site, and it can also be used as a preform.

Refractory castable is currently the most widely produced and used unshaped refractory material. Mainly used to construct various heating furnace linings and other integral structures. Certain high-quality varieties can also be used in smelting furnaces. For example, aluminate cement refractory castables can be widely used in various heating furnaces and other thermal equipment without slag and acid and alkali corrosion. In the parts that are corroded by molten iron, molten steel and molten slag and have high working temperature, such as tapping trough, ladle, blast furnace body, tapping trough, etc., a combination of low calcium and pure high alumina cement can be used. Refractory castable made of high-quality granular and powdery materials with high alumina content and good sintering.

The neutral raw materials are mainly chromite, graphite, and silicon carbide (manually manufactured), which do not chemically react with acidic or alkaline slag under any temperature conditions. There are currently two such raw materials in nature, namely chromite and graphite. In addition to natural graphite, there are also artificial graphite. These neutral raw materials have significant resistance to magnesia carbon bricks against slag, and are most suitable for use as a barrier between alkaline refractories and acid refractories.

Mainly magnesite (magnesite), dolomite, lime, olivine, serpentine, high alumina raw materials (sometimes neutral), these raw materials have strong resistance to alkaline slag and are mostly used for masonry Build an alkaline furnace, but it is particularly easy to chemically react with acidic slag to become salts.

In the past ten years, the technology of magnesia carbon bricks has developed from a relatively mild start to a series of highly complex products that meet the needs of various steelmaking applications. This evolution of advanced products stems from a commitment to ingredient development and the development of new product manufacturing technologies. Steel manufacturers’ commitment to continuous service pilot programs is also a key factor in progress in this field. These efforts have led people to understand which refractory composition is best to provide cost-effective performance under various operating conditions. It is expected that steel manufacturers and refractory material suppliers will continue their efforts to make greater progress. Research and development of carbon additives, metal additives, magnesia properties, brick manufacturing and application, etc.

Semi-dry gunning is a method in which refractory aggregates, binders, additives, etc. are mixed with water through the water ring holes on the magnesia-carbon bricking end of the spray gun and sprayed onto the gunning surface by compressed air. The amount of water can be adjusted at any time according to the spraying situation, and generally fluctuates between 10-20%, which is much lower than that of wet spraying. Therefore, the gunning layer has a large volume density, less shrinkage, and a thicker gunning layer can be obtained. It has better durability, but the rebound amount is slightly higher than that of the wet method. This gunning method is more common.