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Refractory Mortar

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Refractory mortar is made of fine refractory aggregate with fine refractory powders, binders, and admixtures. The specific ingredients are cement, sand, fireclay, and other components such as calcium aluminate. Refractory mortar is mainly used as the joint material for refractory bricks in industrial kilns.

The particle size of refractory mortar varies according to the use requirements. Its limit particle size is generally less than 1mm, and some are less than 0.5mm or finer.

When selecting the material of refractory mortar, it should be consistent with the material of the refractory products of the masonry. In addition to being used as a joint material, refractory mortar can also be used as a protective coating for the lining by applying or spraying.

Application of refractory mortar

Refractory mortar is mainly used in coke ovens, glass kilns, blast furnaces, and other industrial kilns in industries such as metallurgy, building materials, machinery, petrochemicals, glass, boilers, electricity, steel, cement, etc.

Advantages of refractory mortar

Good plasticity, easy to apply

High bonding strength and strong corrosion resistance;

High-temperature insulation and heat preservation for petrochemical equipment, containers, and pipelines

High refractoriness, up to 1650℃±50℃;

Good slag resistance

Good thermal spalling

Classification of refractory mortar

According to the property of the binders. There are ceramic bonding mortars, hydraulic setting mortars, and chemical bonding mortars.

1. Ceramic bonding mortar is a mixer of refractory fine aggregate and ceramic binder (plastic clay). The finished product is dry and needs to be mixed with water when used. It gets hard because of the ceramic bonding at high temperatures.

2. A hydraulic setting mortar is a mixer of refractory fine aggregate and hydraulic binder (cement). The finished product is dry and should be added to water for use. There is no need to use high temperatures for the hardening process.

3. The chemical bonding mortar is a mixture of refractory fine aggregate and chemical binders. The chemical binders can be organic, inorganic, or a mixture of two. The finished product can be pasty or dry. The hardening temperature is below that of ceramic bonding. Based on the difference in hardening temperature, there are air-setting mortars and thermal-setting mortars. Air-setting refractory mortar is often formulated with air-hardening binders such as water glass. Thermal-setting refractory mortar is often formulated with hot-hardening binders such as phosphoric acid or phosphate. After hardening, this thermosetting refractory mortar not only has high strength at various temperatures but also has the characteristics of small shrinkage, tight joints, and strong corrosion resistance.

According to their chemical properties, there are acid, neutral, and base mortars.

According to the materials, there are fire clay mortar, high alumina mortar, silica mortar, and magnesia mortar.

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