High aluminum castable refers to dense refractory castable made of clay and high alumina raw materials, which is mainly used for lining thermal industrial equipment such as industrial kilns.

The use temperature of high aluminum castables is above 1400 degrees, and the aluminum content reaches 74%. It is a commonly used castable for kiln linings. It has the characteristics of high refractoriness, strong thermal stability and good thermal shock resistance.

Features

1. The low cement content in the castable, that is, the low calcium oxide content, reduces the production of low melts in the material, thereby improving the fire resistance, high temperature strength and slag resistance of the product.

2. The amount of water used for stirring the casting material is only about one-half that of the ordinary casting material, thus improving the density of the casting material and reducing the porosity.

3. After molding and curing, less cement hydrates are generated. During heating and baking, there is no large amount of water leakage, which reduces the intermediate temperature strength, but as the temperature increases, the material gradually sinters and the strength continues to increase.

Application

The current high aluminum and high strength castables are mainly used in industrial kilns in metallurgy, machinery manufacturing, petrochemical industry, building materials and other industries

Production process

Raw materials-mixing ratio-mixing-packaging-storage

1. Select the raw materials for making high-aluminum castables according to the formula.

2. Calculate the aggregate and powder gradation and the amount of binders and additives according to the raw material formula, and strictly control the aggregate powder particles.

3. Put the weighed aggregate and powder into the blender and mix evenly, then pour the powder into the aggregate and mix evenly for 8-10 minutes.

4. Fill the mixed high-aluminum castable into a ton bag, equipped with additives and binding agents, and then encapsulate.

5. Packed high-aluminum castables are put in the warehouse for storage, date marking and moisture-proof and waterproof treatment

Precautions

1. When making high aluminum castable slurry, fully stir the dry material and add water. Strictly control the water consumption to avoid affecting the use effect after pouring.

2. When making high-aluminum mud, you need to use a mixer to stir, and manual mixing is prohibited.

3. Manufacture according to the required dosage. The finished castable should be used up within 30 minutes. If condensation occurs, it cannot be used again.

4. During construction, pay attention to avoid anchor parts.

5. Determine the pouring thickness according to the design, and it cannot be poured at will.

6. After pouring and baking, pay attention to the heating rate and time, and do not heat up too quickly. A

7. After demoulding, check the casting body, if there are construction problems, rework according to the situation to ensure the practicability of the casting body.

Physical And Chemical Indicators