The main differences between super-grade bauxite and I-grade bauxite are chemical composition, physical properties and application scenarios. The following are specific comparisons:

I. Chemical composition

Super-grade bauxite: Al₂O₃ content ≥85%, and impurity content is extremely low, such as Fe₂O₃ content is usually less than 1.4% and CaO content is less than 0.6%.

Grade I bauxite: Al₂O₃ content is between 75% and 85%, and impurity content is relatively high, Fe₂O₃ content is less than 3.0%, and CaO content is less than 0.6%.

II. Physical properties

Super-grade bauxite: the fire resistance can reach above 1790℃, and the bulk density is ≥ 3.6g/cm.

Grade I bauxite: the refractoriness is 1790℃ and the bulk density is ≥ 3.0g/cm.

III. Application scenarios

Super-grade bauxite: it is mainly used to produce high-purity refractory materials, such as high-alumina bricks and corundum bricks, and is widely used in high-temperature furnace lining in steel, glass, ceramics and other industries, as well as high-tech fields such as electronic ceramics and sapphire crystal growth.

Grade I bauxite: It is suitable for medium-high temperature refractories, such as high-alumina bricks and castables, and is mainly used for lining of blast furnaces, rotary kilns and electric furnaces in iron and steel plants, and can also be used for products with high aluminum content in ceramic industry.

IV. Appearance color

Super bauxite: usually earthy gray or dark gray.

Class I bauxite: the color is earthy gray or dark gray.

V. Calcination temperature

Special grade bauxite: The calcination temperature is usually 1600℃ to 1700℃.

Grade I bauxite: The calcination temperature is generally from 1500℃ to 1600℃.

To sum up, super-grade bauxite is superior to grade I bauxite in chemical composition, physical properties and application scenarios, and is mainly used in fields with higher requirements on aluminum content and fire resistance.