high alumina bauxite

High alumina bauxite is also called high alumina grog or aluminum ore. Its main component is alumina, which is hydrated alumina, containing impurities. It is an earthy mineral. Types are divided into raw alumina and processed alumina. Бокситом в огнеупорной промышленности обычно называют боксит с кальцинированным Al2O3 >= 48% and low Fe2O3 content. High alumina clinker – this is calcined bauxite. It is mainly used for precision casting in aluminum industry, fireproof products, high alumina bauxite, aluminosilicate refractory fiber and bauxite cement production.

Physical and Chemical Index of high-alumina bauxite

At the cargo	Chemical composition (mass fraction),%					Bulk density, g/cm3	Water absorption rate %
	Al2O3	Fe2O3	TiO2,	CaO+MgO	K2O+Na2O
GL-90	≥89.5	≤1.5	≤4.0	≤0.35	≤0.35	≥3.35	≤2.5
GL-88BA	≥87.5	≤1.6	≤4.0	≤0.4	≤0.4	≥3.20	≤3.0
GL-88B	≥87.5	≤2.0	≤4.0	≤0.4	≤0.4	≥3.25	≤3.0
GL-85A	≥85	≤1.8	≤4.0	≤0.4	≤0.4	≥3.10	≤3.0
GL-85B	≥85	≤2.0	≤4.5	≤0.4	≤0.4	≥2.90	≤5.0
GL-80	>80	≤2.0	≤4.0	≤0.5	≤0.5	≥2.90	≤5.0
GL-70	70~80	≤2.0	—	≤0.6	≤0.6	≥2.75	≤5.0
GL-60	60~70	≤2.0	—	≤0.6	≤0.6	≥2.65	≤5.0
GL-50	50~60	≤2.5	—	≤0.6	≤0.6	≥2.55	≤5.0

Introduction to Bauxite Clinker

Bauxite clinker, high aluminum content material, called boiled bauxite after, how raw bauxite is calcined at high temperature (1200~1700℃). The main minerals of bauxite clinker are diaspores and high alumina silica, and the content of diaspores increases with increasing proportions of Al2O3 and SiO2. Secondary minerals include rutile, iron ore, etc..

Characteristics of High Alumina Bauxite

The fire resistance of high-alumina bauxite clinker reaches 1780°C. It has high chemical stability, good physical properties and very significant fire-resistant effect. Therefore, it is widely used in fireproof and anti-corrosion materials of metallurgical industry. Clinker is processed into fine powder, casting molds are formed from it, and then produce precision casting. It is used in military, aerospace industry, communications, instrument making, mechanical engineering and medical equipment.

Uses of bauxite clinker

Bauxite can be used as various high alumina bricks and their clinkers, and also widely used as fireproof or anti-corrosion materials in metallurgy and other industries, especially for the manufacture of electric furnace covers, blast furnaces and hot blast furnaces. The fireproof effect is very obvious, and its performance characteristics are better, than ordinary clay fire bricks.

Classification of bauxite clinker

1. High-alumina bauxite of the first grade refers to high-alumina bauxite with an iron content of less than 2,2%. It is commonly used to make ceramics and high-quality building materials. Due to the low iron content the product quality is higher.
2. Secondary high-alumina bauxite refers to high-alumina bauxite with iron content ranging from 2,2% to 2,8%. It is commonly used to produce building materials and advanced fireproof materials. Lower iron content results in higher quality products.
3. High-alumina bauxite of the third grade refers to high-alumina bauxite with an iron content of 2,8% to 3,5%. Due to its slightly higher iron content, it is primarily used in the production of general building materials and base materials, such as bricks and tiles.