Electric Furnace Bottom Ramming Material

The ramming material for electric furnace bottom is made of silicon carbide, graphite, electric calcined anthracite as raw materials, mixed with a variety of ultrafine powder additives, 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.
The ramming material has good chemical stability, erosion resistance, wear resistance, peeling resistance, and thermal shock resistance. It is widely used in metallurgy, building materials, non-ferrous metal smelting, chemicals, machinery and other manufacturing industries!

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Description

1.)Ramming material:It is manufactured by using High quality synthetic MgO-CaO-Fe₂O₃sand as raw materials,and determing reasonably granular composition.The product has good sintering property,strong corrosion resistance,convenient construction,strong integrity,which can be also used for the first time,hot repair,and suitable for high power electric furnace,ultra high power electric furnace bottom,furnace slope and other parts.

2.)Gunning mix for Slag line:It is manufactured by using high quality dead burned magnesia and other basic composite materials,through good grain size selection.The product has good sintering and slag erosion resistance,the construction of the rebound rate is small,high adhesion rate,easy for spray repair operation.It is suitable for hot spot,slag line,furnace slope,side wall and steel outlet of electric furnace and ultra-high power electric furnace.It is helpful to improve the evenness of furnace lining erosion and is an ideal material for improving the service life.

With the development of ultra-high power electric furnaces, the furnaces are large-scale, the production is continuous, and the high-temperature and high-efficiency operation has aggravated the damage of the furnace lining. Therefore, refractory gunning materials came into being. At present, there are many domestic manufacturers producing them, which basically meet the needs of electric furnace repair.

Refractory gunning materials can be used to repair the furnace by semi-dry method, dry method or throwing method. The main parts are hot spots and slag line areas, and the gunning thickness is 20~100mm.

The volume density of heavy refractory spray coatings is generally >1.8g/cm3. Refractory aggregates and powders are generally made of aluminum silicate materials, with a critical particle size of 10mm or 5mm, and particle composition: 5~3mm30%; 3~1mm, about 30%; <1mm, about 40%; binders are aluminate cement and water glass, etc., plus admixtures. Construction is generally carried out by semi-dry method or pseudo-dry method.

In recent years, refractory spray coatings with a volume density of 1.8~2.1g/cm3 have been developed, also known as medium and heavy refractory castables. The material is prepared by adding 3%~6% expanded perlite or 5%~20% porous clinker to heavy material. It is mainly used for the thermal insulation layer of smelting furnaces and thermal equipment. It is safe, reliable and has good effects.

Brand Item		HX-MCF-7	HX-MCF-12	HX-PBL-A	HX-PBL-B
Mg0 %		≥80	≥75	85	80
Ca0 %		7-9	12-14	-	-
Fe₂O₃ %		5-7	5-7	-	-
SiO₂ %		≤ 1.2	≤ 1.2	≤ 4	≤ 6
Modulus Of RuptureMpa	100℃×24h	-	-	≤ 0.5	≥ 0.5
	1500℃×3h	-	-	≥ 6	≥ 6
Linear change rate %	1500℃×3h	-	-	-0.9	-0.1
Granularity (mm)		0-5	0-6	0-3	0-4

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