Industrial Applications of Bauxite

1. Aluminum Smelting Industry (Largest Application, over 85% of total consumption)

Production Route

Downstream Uses

• Lightweight transportation: automobile bodies, engine parts, high-speed train carriages, aircraft fuselages, aluminum structural components for ships

• Power transmission: high-voltage aluminum cables, transformer aluminum components with light weight and excellent electrical conductivity

• Packaging & daily goods: beverage cans, food aluminum foil, pharmaceutical packaging, casings for air conditioners, refrigerators, televisions and other home appliances

• Aerospace & military: lightweight frames for aircraft, missile shells, structural parts for military equipment

• Machinery & construction: aluminum alloy doors, curtain walls, components for construction machinery

2. Refractory Materials Industry (Second Major Application)

• Shaped refractory products: high-alumina bricks, alumina-magnesia carbon bricks, corundum bricks for lining blast furnaces, converters, ladles, cement rotary kilns, glass melting furnaces and non-ferrous smelting furnaces

• Unshaped refractory materials: castables, ramming mixes and spray coatings compounded with bauxite aggregate and fine powder, for on-site pouring of kiln repairs, special-shaped ladles and iron runners

• Aluminum silicate refractory fibers: blankets, boards and fireproof cloth made by melting and blowing at high temperature; low thermal conductivity for thermal insulation of high-temperature equipment, energy saving of industrial kilns, fireproof garments and nuclear heat insulation parts

3. Precision Casting Industry

• Cast shells deliver high heat resistance, stable dimensional accuracy and low deformation

• Suitable for precision castings of military fittings, aerospace parts, instruments, medical devices and high-end machinery, yielding smooth castings free of blowholes

4. Ceramics Industry

(1) Architectural & Sanitary Ceramics

(2) Electronic & Special Industrial Ceramics

5. Chemical & Water Treatment Industry

• Water purification flocculants: raw material for aluminum sulfate and polyaluminum chloride (PAC), core reagents for municipal sewage, industrial wastewater and tap water purification

• Aluminum salt chemical feedstock: production of aluminum hydroxide, aluminum pigments, catalysts and printing mordants

• High-alumina rapid-hardening cement (bauxite cement): calcined mixture of bauxite and limestone with fast setting, high strength and acid-alkali resistance, used for emergency repairs, low-temperature construction, refractory floors and special underground projects

6. Abrasives, Fillers and Other Auxiliary Fields

• Artificial corundum abrasives: brown and white corundum smelted from bauxite in electric arc furnaces for grinding wheels, cutting discs and polishing powder applied in metal cutting, hardware grinding and stone polishing

• Filler for rubber, plastic and coatings: ultrafine bauxite powder enhances wear resistance, weather resistance and flame retardancy of plastics and anti-corrosion paints

• Welding flux additive: stabilizes electric arc, reduces spatter and optimizes weld formation

• Petroleum proppants (ceramic sand): high-strength ceramsite sintered from bauxite as fracturing support aggregate for oil and gas wells

Grade Matching Classification

1. Metallurgical grade: high alumina-silica ratio with controlled impurities for alumina and electrolytic aluminum production

2. Refractory grade: Al₂O₃ ≥48%, low iron and impurities for calcined refractory clinker

3. Casting & ceramic grade: uniform fineness and stable whiteness with strictly limited ferric oxide to avoid yellow discoloration

4. Water treatment chemical grade: easy dissolution of aluminum ions, moderate requirements on whiteness and fineness