Sillimanite, Mullite, Corundum Fireclay

Sillimanite, mullite and corundum refractory raw materials are used to prepare the powder used for refractory mud. Refractory clinker powder is added with an appropriate amount of plastic clay as a binder and plasticizer. The strength at room temperature is low, and it has a higher strength when ceramic bonding is formed at high temperature. Chemically bonded refractory muds with hydraulic, gas-hardening or thermosetting binding materials as binders are called chemically bonded refractory muds. Before the temperature is lower than the temperature of forming ceramic bonding, a certain chemical reaction occurs and hardens. Bulk density: 1.8-2.2g/cm3.

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Description

The particle size of sillimanite, mullite and corundum fireclays varies according to the use requirements. The limit particle size is generally less than 1mm, and some are less than 0.5mm or finer. When selecting the material of sillimanite, mullite and corundum fireclay, it should be considered to be consistent with the material of the refractory products of the masonry. In addition to being used as caulking materials, sillimanite, mullite and corundum fireclays can also be used as protective coatings for linings by smearing or spraying.

Characteristics and applications of sillimanite, mullite and corundum fire clay:

1. Good plasticity and convenient construction;

2. High bonding strength and strong corrosion resistance;

3. High refractoriness, up to 1650℃±50℃;

4. Good resistance to slag erosion;

5. Good thermal spalling. Refractory clay is mainly used in coke ovens, glass kilns, blast furnace hot blast furnaces and other industrial kilns. Application industries include: metallurgy, building materials, machinery, petrochemicals, glass, boilers, electricity, steel, cement, etc.

Sillimanite, mullite, corundum fireclay

Item		Sillimanite mortar	Mullite mortar				Corundum mortar
		HX-MS-58	HX-MM-65	HX-MM-70	HX-MM-75	HX-MM-80	HX-CM-90	HX-CM-95
Al₂O₃ % ≥		58	65	70	75	80	90	95
Fe₂O₃ % ≤		0.8	0.8	0.8	0.5	0.5	0.4	0.3
Refractoriness % ≥		1760	1760	1780	1800	1800	1800	1800
Cold modulus of rupture and bonding strength MPa ≥	Drying at 110℃	1.0	1.0	1.0	1.0	1.0	1.0	1.0
	After sintered at 1450℃	4.0	4.0	4.0	4.0	4.0	3.5	3.0
Linear change rate *1450℃ 3h %**		+1 - -5	+1 - -5	+1 - -3	+1 - -3	+1 - -3	+1 - -3	+1 - -3
Bonding time (S)		60-180

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