Dispersive air brick

Abstract

The invention relates to an air brick, in particular to a dispersive air brick manufactured by a cast molding technology. The materials comprise main raw materials, micro-powder, an expanding agent, a bonding agent, a dispersing agent, a microvesicle air entraining agent and a foam stabilizing agent, wherein the microvesicle air entraining agent adopts rosin ester air entraining agent, the foam stabilizing agent adopts nonionic type acid amide foam stabilizing agent, and the dispersing agent adopts organic nonionic type water reducing agent. Inorganic salt ionic type water reducing agent and acidic and weak acidic retarder are not recommended to use in the materials. A blank molded by the materials needs to be immediately maintained at high temperature so as to accelerate blank hardening. The dispersive air brick adopts the cast molding technology and has simple technology process, less equipment investment and high production efficiency, and not only the dispersive air brick with a regular shape can be manufactured, but also a large special-shape dispersive air brick can be manufactured; and the manufactured product has even air hole distribution, stable venting performance, molten steel scouring resistance, high erosion ability and good stripping resistance.

Description

Technical field [0001] The invention relates to a breathable brick, in particular to a diffused breathable brick manufactured by a pouring molding process. Background technique [0002] It is a technology commonly used in the modern metallurgical industry to pass gas into the molten metal container to stir the metal liquid, to accelerate the metallurgical process, to uniform the temperature and chemical composition of the metal liquid, to promote the removal of inclusions or to control the shape of inclusions. There are two ways to blow gas into the molten metal container, one is to use a blow gun to insert the metal liquid from the top of the container for blowing operation, and the other is to use a bottom blowing air brick to send gas into the container from the bottom of the container In China, the method of blowing air bricks at the bottom is cheaper, more convenient and more practical, so it is widely used. [0003] According to the structure of the ventilating brick ...

AI Technical Summary

Problems solved by technology

Because the molding process is not easy to control, ramming molding is rarely used in practice because the molding process is difficult to control. The relatively mature technology is semi-dry pressing molding and isostatic pressing molding. Semi-dry pressing molding is suitable for manufacturing those Breathable bricks with relatively regular shape and not too large brick body are not suitable for large special-shaped bricks; isostatic pressing is based on Pascal's principle, pressurizing the liquid, and evenly transmitting the pressure to the material through the rubber membrane sleeve, which can be obtained The green body is uniform in all directions, but the process equipment has large investment, high cost, low output and complicated process

[0005] However, some use parts require large-scale special-shaped dispersion-type ventilation bricks, which are used in large quantities and relatively low in price, such as dispersion-type ventilation bricks for argon blowing in continuous casting tundishes used in the iron and steel metallurgical industry, etc., which are not suitable for manufacturing using traditional molding processes This type of breathable brick

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