The technical indicators of high-aluminum castables are the main reference in the procurement process, which determine the quality of high-aluminum castables. There are 7 main technical indicators of high-aluminum castables, which are Al2O3 content, bulk density, and apparent porosity. Rate, compressive strength at room temperature, softening temperature under load, thermal shock stability. Below, take the high-aluminum refractory castable as an example to analyze its technical indicators. 1. Al2O3 content The popular point of Al2O3 content is the content of aluminum oxide in high-aluminum castables, which determines the level of other various properties. Therefore, it is the main performance index of high alumina castable. 2. Bulk density The bulk density is the ratio of the dry mass of the high-aluminum castable to its total volume, and the unit is gcm3. The bulk density mainly indicates the compactness of the high-aluminum castable. Generally, the bulk density of high-alumina castables is closely related to its porosity and mineral composition. 3. Flexural strength at room temperature The normal temperature flexural strength is the bending stress that a strip test block made of high-aluminum castable can withstand in the test. The chemical composition, mineral composition, organizational structure, and production technology of the material have a decisive influence on the flexural strength of the material, especially the high temperature flexural strength. Usually select high-purity raw materials, control the material's reasonable particle gradation, increase the molding pressure, use the bonding agent and increase the sintering degree of the product, which can improve the flexural strength of the material. 4. Compressive strength at room temperature Compressive strength refers to the ultimate load that a high-aluminum castable construction body can withstand without being damaged per unit area at a certain temperature. The compressive strength at room temperature can indicate the sintering condition of the material and the properties related to its structure. In addition, the compressive strength at room temperature can indirectly judge other properties, such as wear resistance and impact resistance. 5. Load softening temperature The load softening temperature of high aluminum castable refers to the temperature at which deformation occurs during use. The load softening temperature indicates the ability of the refractory to resist both high temperature and load, and to a certain extent indicates the structural strength of the product under similar conditions of use. 6. Alkali resistance High-alumina castables for cement kilns are often eroded by alkaline gas in the kiln, so it is very necessary to test the alkali resistance of the materials. Alkali resistance is the ability of refractory castables to resist alkaline erosion at high temperatures. The above is the key to the technical performance indicators of high-aluminum castables. When purchasing and using high-aluminum castables, they must be selected in strict accordance with the actual furnace requirements to ensure the service life of high-aluminum castables. Under the premise, extend the life cycle and save maintenance costs.
Industry News

Corundum wear-resistant castable belongs to the field of high-temperature wear-resistant refractory materials. The raw materials are composed of high-alumina homogeneous material, alumina powder, silica powder, clay, phosphoric acid, aluminum dihydrogen phosphate solution, and pure calcium aluminate cement. It is characterized by the use of synthetic homogeneous materials with low water absorption, low porosity and high uniformity to replace the traditional natural raw materials or corundum composite raw material system of sintered bauxite clinker with high water absorption, high porosity and poor uniformity. High-quality corundum, high-strength, wear-resistant and plastic.

1) How to use

This material adopts the ramming construction technology, which is suitable for the construction of parts with thin thickness such as the water wall of the furnace. After construction, the wear-resistant layer has high strength and wear resistance, which is different from the castable. The plastic does not need to support the mold, and the construction method of smearing and ramming is directly adopted. The material of the invention has good construction performance, high strength, good wear resistance, and the best on-site use effect, which is beneficial to prolong the service life of the furnace lining and improve the utilization efficiency of the high-temperature kiln.

2) Applicable area

It is mainly used in the dense phase area of the furnace and steam-cooled/water-cooled/adiabatic cyclone separators. The wear-resistant refractory material in this area is designed as a single-layer ramming structure and fixed by wear-resistant pins. The thickness of the design varies. Generally, the thickness is 40-60mm (air-cooled/water-cooled), 320-350mm (heat-insulated), only It needs to be laid directly on the construction surface.