The calcination temperature and usage of bauxite are as follows:

I. Calcination temperature

The calcination temperature of bauxite is usually between 1400℃ and 1700℃, and the specific temperature needs to be adjusted according to the grade and use of bauxite. The following are the calcination temperature ranges of different grades of bauxite:

Super bauxite: 1600℃ to 1700℃.

Grade I bauxite: 1500℃ to 1600℃.

Grade II bauxite: 1600℃ to 1700℃.

Grade III bauxite: 1500℃ to 1550℃.

II. Calcination method

Preheating stage (400℃ to 600℃): mainly used to remove crystal water from bauxite.

High temperature calcination stage (1400℃ to 1700℃): This stage is the main calcination stage of bauxite, and the temperature needs to be accurately controlled according to the grade of bauxite.

Cooling stage: After the calcination is completed, the materials should be slowly cooled to normal temperature to prevent pulverization caused by rapid cooling.

III. Calcination equipment

Bauxite calcining equipment mainly includes the following types:

Vertical kiln: suitable for large-scale production, the calcination temperature is generally 1400℃ to 1600℃.

Rotary kiln: suitable for large-scale production, the calcination temperature is generally 1400℃ to 1600℃.

Inverted flame kiln: suitable for small batch production, the calcination temperature is generally 1400℃ to 1600℃.

IV. Method of use

Calcined bauxite clinker has high fire resistance and mechanical properties, and is widely used in the following fields:

Refractory: used to make shaped and unshaped refractories such as high-alumina refractory bricks and castables.

Ceramic and high-voltage electric porcelain industry: calcined bauxite is used in ceramic industry, giving ceramic products good strength and wear resistance.

Casting and precision machining: bauxite clinker fine powder can be used for precision casting molds, which has the characteristics of no deformation at high temperature and strong wear resistance.

Abrasive material: used to make abrasives.

Chemicals: various compounds used to produce aluminum.

By accurately controlling calcination temperature and using appropriate calcination equipment, the properties of bauxite can be effectively improved to meet the needs of different industrial applications.