Name: Liaoning Ming Yan new material manufacturing Co., Ltd.

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Several ways of using gunning materials

Date:2018-01-13 Author: Click:

What are the different ways of gunning materials?

1. Wet spraying is a method of mixing refractory aggregates, binders, additives and water to make mud with a certain consistency, and then spraying the mud to the spraying surface with compressed air through the spraying machine. Its characteristics are simple operation, high adhesion rate and quick sintering. But because of the large water content and fine grain, the shrinkage is also large. At the same time, because the spray coating is thinner, the durability is not good.

2. Semi-dry spraying is a method of mixing refractory aggregate, binder and additive with water through the water ring hole at the spray gun end and spraying compressed air to the spray patch surface. The amount of water can be adjusted at any time according to the spray patch situation, generally fluctuating between 10 and 20%, which is lower than that of wet spraying patch. It's much more. Therefore, the spraying layer with high volume density and small shrinkage can obtain a thicker spraying layer with better durability, but the springback is slightly higher than that of wet method. The unshaped refractory material is sprayed with jet machine. It consists of refractory aggregate and powder, binder and additive. According to the material, it is divided into alkaline, aluminosilicate, zirconium and silicon carbide. Main use

Sprayed material

In steel and non-ferrous metal smelting furnace, and heating furnace repair. Neutral refractories are alumina, chromium oxide or carbon. Corundum products containing alumina 95% are a high quality refractory material that is widely used. The chromium brick with chromium oxide as the main component has good corrosion resistance to steel slag, but its thermal vibration resistance is poor, and the deformation temperature under high temperature load is low. Carbonaceous refractories include carbon bricks, graphite products and silicon carbide products. They have low thermal expansion coefficient, high thermal conductivity, good thermal vibration resistance, high temperature strength, acid-base resistance and salt resistance, and are not wetted by metals and slags. Widely used as lining material for high temperature, and also used as autoclave for petroleum and chemical industry.

Alkaline refractories are mainly composed of Magnesium Oxide and calcium oxide, and commonly used magnesia bricks. Magnesium bricks containing more than 80% - 85% magnesia have good resistance to alkaline slag and iron slag, and have higher refractoriness than clay bricks and silica bricks. Mainly used in open hearth furnace, oxygen blowing converter, electric furnace, non-ferrous metal smelting equipment and some high temperature equipment.

Refractories used in special occasions include high-temperature oxide materials, such as alumina, lanthanum oxide, cymbal oxide, calcium zirconia, refractories such as carbides, nitrides, borides, silicides and sulfides, and high-temperature composite materials, such as cermet, high-temperature inorganic coatings and fibers. Reinforced ceramics, etc.