Cement; aluminous (ciment fondu), whether or not coloured or in the form of clinkers

HS code 252330 covers aluminous cement, also known as 'ciment fondu'. This specialized type of cement is produced through the fusion of limestone and bauxite, and is characterized by its high alumina content. Aluminous cement is valued for its rapid hardening, high early strength, and resistance to chemical attack, making it a crucial material in the construction and infrastructure industries. Its unique properties make it an essential component in a wide range of applications, from concrete foundations to refractory linings, contributing significantly to the overall economy.

The production of aluminous cement involves the fusion of limestone and bauxite at high temperatures, typically around 1,450°C. The raw materials are first crushed, mixed, and then fed into a rotary kiln, where the fusion process takes place. The resulting molten material is then rapidly cooled, forming clinkers. These clinkers are then ground into a fine powder, which is the final aluminous cement product.

The primary raw materials required for the production of aluminous cement are limestone and bauxite. Limestone provides the calcium oxide, while bauxite supplies the alumina. Additional minor ingredients, such as gypsum or other additives, may be included to modify the cement's properties. The production process also requires specialized equipment, including rotary kilns, grinding mills, and material handling systems.

Aluminous cement produced under HS code 252330 is primarily used in the construction industry, where it is valued for its rapid hardening, high early strength, and resistance to chemical attack. It is commonly used in concrete foundations, industrial floors, refractory linings, and other applications where these properties are essential. The output of this industry may be consumed by other industries, such as 681011 Building blocks and bricks, 681019 Building bricks, blocks and the like, of cement, concrete or artificial stone, not elsewhere specified or included, and 681091 Prefabricated structural components for building or civil engineering, of cement, concrete or artificial stone, not elsewhere specified or included.