Types and applications of refractory ramming materials

Refractory ramming materials generally refer to dry ramming mass, which includes clay, high alumina, Mullite, korund, silicon, magnesium, karbid křemíku, mullite corundum, atd. It is a bulk material made of a variety of ultrafine powder additives, fused cement, or composite resin as a binder. The different bonding methods are water glass, phosphoric acid, phosphate, aluminum sulfate, brine, high alumina cement, clay, and other binders. It is used to fill the gap between the furnace cooling equipment and the masonry or as a filler for the masonry leveling layer. The ramming mass has good chemical stability, is resistant to erosion, wear, peeling, and thermal shock, and is widely used in metallurgy, stavební materiály, non-ferrous metal smelting, chemicals, machinery, and other manufacturing industries.

Acidic, neutral, and alkaline ramming masses are widely used in coreless medium-frequency furnaces and cored induction furnaces. As medium frequency furnace ramming masses, they are used to melt gray cast iron, ductile iron, calcined cast iron, vermicular cast iron and cast iron alloys, melt carbon steel, alloy steel, high manganese steel, tool steel, heat-resistant steel, stainless steel, melt aluminum and its alloys, melt copper, brass, nickel silver, bronze and other copper alloys and other special steels.

Uhlíková pěchovací hmota

Podle různých typů vysokých pecí a různých požadavků na materiálové provedení, carbon ramming mass is mainly used for the gaps between the carbon bricks at the bottom of the blast furnace and the sealing plate at the bottom, between the carbon bricks at the hearth and the cooling wall, as well as the leveling above the center line of the water cooling pipe at the bottom of the furnace and the filling of the cooling wall. All parts require that the carbon ramming mass after ramming has a certain strength and density, filling every corner and very small gap to meet the requirements of no leakage of molten iron and coal gas, and the thermal conductivity of the carbon ramming mass should be basically consistent with the performance of the hot carbon bricks and cooling wall of the blast furnace, so as not to affect the life of the blast furnace, thereby maintaining the normal production of the blast furnace.
V současné době, the common problem encountered in the use of carbon ramming mass is that the thermal conductivity of general carbon ramming mass is low, což neprospívá rychlému ochlazení tělesa vysoké pece, thus affecting the service life. Proto, the updated research and application of carbon ramming mass with high thermal coefficient has great market prospects. Whether adding admixtures to the carbon ramming material to change the material properties through in-situ reactions at high temperatures, nebo změna místní struktury využití materiálu z hlediska návrhu, the carbon ramming material layer can reach a thermal conductivity that matches the carbon bricks and cooling walls when the working temperature rises, so as to ensure normal heat conduction without damaging the overall construction structure, thereby achieving the requirement of increasing the life of the blast furnace.

Křemičitá pěchovací hmota

Silica ramming material, the main raw material, je oxid křemičitý. silica is the general name of vein quartz, křemenec, a křemenného pískovce. It is mainly used for acid refractory bricks in the metallurgical industry. Pure silica can be used to make quartz glass or extract single crystal silicon. It is used in the chemical industry to prepare silicon compounds and silicates and can also be used as a filler for sulfuric acid towers. It is used in the building materials industry for glass, keramika, silicate cement, atd. The appearance properties are mainly the shape, cross-section, color, gloss, inclusions, atd. of silica. By appearance, it can be preliminarily determined whether the silica is crystalline silica or cemented silica, whether it is vein quartz, atd. The appearance of crystalline silica is generally milky white, grayish white, light yellow, and reddish brown. It has a bright luster, a smooth and continuous cross-section, and sharp edges and corners, and has great hardness and strength. Vein quartz is dense and blocky, pure white, translucent, and has a greasy luster. The cross-section is shell-shaped, and the quartz crystal particles are mostly more than 2mm and can be seen by the naked eye. The appearance of cemented silica is white, grayish white, yellow-gray, black, red, atd. The cross section is dense and shell-shaped, without obvious granular structure. The sharp edges of the cross section are not obvious, and it is almost flat and has no luster. Good silica should be dense and blocky, sometimes with shell-shaped or scaly cross sections, without obvious layered structure, no inclusions between layers, and no limestone shell. Its color depends on impurities. Usually, iron compounds make silica reddish brown, while organic impurities make silica gray, black, atd.

Korundová pěchovací hmota

Corundum ramming material is a bulk material made of corundum, karbid křemíku, grafit, and electric calcined anthracite as raw materials, smíchaný s řadou ultrajemných práškových přísad, and fused cement or composite resin as a binder. It is used to fill the gap between the furnace cooling equipment and the masonry or as a filler for the masonry leveling layer.

Hořčíková pěchovací hmota

Hořčíková pěchovací hmota je sypký materiál vyrobený z tavené magnézie jako suroviny, smíchaný s řadou ultrajemných práškových přísad, and fused cement or composite resin as a binder. It is used to fill the gap between the furnace cooling equipment and the masonry or as a filler for the masonry leveling layer.

Medium-frequency furnace ramming mass

The medium frequency induction furnace is made of an induction coil made of a copper tube and wound around the outside of the furnace. Kovová vsázka se umístí do pece. Když střídavý proud prochází indukční cívkou, v cívce vzniká střídavý magnetický tok. Přes uzavřenou kovovou nálož, an induction current is generated within a certain depth on the surface of the charge, způsobí zahřátí a roztavení náboje. The furnace lining is built with refractory materials, které vyžadují dobrou odolnost proti korozi, odolnost proti odlupování, žádné praskliny, and long service life. The material used for the medium frequency furnace is the medium frequency furnace ramming material, and its main performance indicators.