OVERVIEW OF BAUXITE
Bauxite, also known as alum earth, is a type of ore containing aluminium hydroxide minerals. Industrially viable bauxite is a general term for ores mainly composed of gibbsite and boehmite (monohydrate alumina minerals). It serves as the primary raw material for the production of primary aluminium, which accounts for over 90% of global bauxite consumption.
-
Chemical Composition
Alumina: 40%–70%, plus silica, iron oxide, titanium oxide, etc.
-
Appearance
Variable colours, commonly white, off-white, pale yellow, brown and so on.
-
Mineral Composition
Diaspore, boehmite, gibbsite, etc.
-
Physical Properties
Mohs hardness: 1–3
Density: approximately 2.4–2.5 g/cm³
CLASSIFICATION OF BAUXITE
- Mineral composition
- Chemical composition
- Application
High-alumina bauxite falls into two main categories: monohydrate-type high-alumina bauxite and trihydrate-type high-alumina bauxite. The monohydrate type is predominantly composed of monohydrate alumina minerals, including diaspore and boehmite (also known as boehmite). The trihydrate type is mainly composed of gibbsite. The high-alumina bauxite produced in the vast majority of producing areas in China belongs to the monohydrate type.
| Basic Types | Subtype |
| Monohydrate-Type High-Alumina Bauxite | |
| Diaspore-Kaolinite type (D-K type) | |
| Diaspore-Pyrophyllite type (D-P type) | |
| Boehmite-Kaolinite type (B-K type) | |
| Diaspore-Illite type (D-I type) | |
| Diaspore-Kaolinite-Rutile type (D-K-R type) | |
| Trihydrate-Type High-Alumina Bauxite | Gibbsite type (G type) |
| Grade | Chemical Composition | Refractoriness | Bulk Density | ||
| Al₂O₃ | CaO | Fe₂O₃ | |||
| Special Grade | >85 | <0.6 | <1.4 | >1790 | >3.6 |
| Grade 1 | >80 | <0.6 | <1.5 | >1790 | >3.0 |
| Grade 2A | 70-80 | <0.8 | <1.3-1.7 | >1790 | >2.8 |
| Grade 2B | 60-70 | <0.8 | <1.3-1.7 | >1770 | >2.65 |
| Grade 3 | 50-60 | <0.8 | <2 | >1770 | >2.55 |
-
01 Metallurgical Grade Bauxite
Mainly used for alumina extraction to produce metallic aluminium.
-
02 Refractory Grade Bauxite
Used to manufacture various refractory materials, such as refractory bricks and castables.
-
03 Ceramic Grade Bauxite
Applied as a raw material or additive for ceramic bodies in ceramic production.
-
04 Abrasive Grade Bauxite
Primarily used for making abrasive tools such as sandpaper and grinding wheels.
RAW BAUXITE AND BAUXITE CLINKER
Definitions:
Raw Bauxite：Bauxite ore mined directly from mines without high-temperature calcination.
Bauxite Clinker：The product obtained after high-temperature calcination of raw bauxite.
Hardness:
Raw Bauxite：Relatively soft and porous.
Bauxite Clinker：Higher hardness with dense structure.
Appearance:
Raw Bauxite：Variable colours including off-white, dark grey, brown, etc., with a relatively rough surface.
Bauxite Clinker：Relatively uniform colours, mostly white, light grey, etc., with a comparatively smooth surface after calcination.
Differences in Application:
Raw Bauxite： 1.It serves as a key raw material for alumina extraction in the alumina industry. 2. It can also be used to make basic refractory materials. However, due to inferior performance compared with bauxite clinker, it is generally applied in scenarios with low refractory performance requirements.
Bauxite Clinker： 1. It is a key raw material for manufacturing high-grade refractory materials, such as linings for steel ladles and blast furnaces used in steelmaking. 2. It is also used in the abrasive industry; its high hardness makes it suitable as an abrasive material.
APPLICATIONS OF BAUXITE
Metallurgical Industry
01 Aluminium Smelting
02 Aluminium Alloy Additives
Refractory Materials Industry
01 Refractory Brick Production
02 Refractory Castables
03 Other Refractory Products
Chemical Industry
01 Catalysts
02 Adsorbents
Building Materials Industry
01 High-Alumina Cement Production
02 Concrete Admixtures
03 Fillers and Pigments
Foundry Industry
01 Molding Sand and Coatings
Abrasive and Ceramic Industry
01 Abrasive Materials
02 Ceramic Raw Materials
DEEP GRINDING PROCESSING OF BAUXITE
As a total solution provider for grinding equipment, Zenith is committed to delivering high-efficiency, energy-saving and eco-friendly grinding machinery and services for customers. With nearly four decades of experience in mill manufacturing, Zenith has developed a full range of grinding mills including the LM Vertical Roller Mill, MTW European Trapezium Mill, LUM Ultra-fine Vertical Roller Mill and XZM Ultra-fine Mill. These models can meet various fineness requirements for bauxite and other materials, featuring stable operation, cost-effective investment and environmentally friendly performance.
-
LM Vertical Roller Mill
-
MTW Trapezium Mill
-
LUM Vertical Mill
-
XZM Ultrafine Mill
LM Vertical Roller Mill
Equipped with a new grinding device and automatic electronic control system
Integrates drying, grinding, powder classification and conveying in one unit
Fineness Range:20-400 mesh (0.84-0.038 mm)
-
Leading technology
-
Low investment cost
-
High grinding efficiency
-
Low operating cost
-
Advanced and stable transmission system
-
Consistent product quality & eco-friendly performance
-
High drying efficiency with automatic slag removal
-
Easy operation and reliable performance
MTW European Trapezium Mill
Adopts thin oil lubrication system and new suspended cage-type powder classifier structure design
It is an upgraded replacement for traditional Raymond mills and pendulum mills
Fineness Range: 12–325 mesh (1.6–0.045 mm)
-
Mature and stable equipment
-
Integrated comprehensive solutions
-
Energy-saving and eco-friendly
-
High efficiency and large output
-
Advanced transmission system
-
Multi-purpose machine, cost-effective investment
-
High-performance fan configuration
-
New classifier with high classification accuracy
LUM Ultra-fine Vertical Roller Mill
Intelligent control, with roller grinding units and multi-head classifiers
Large grinding mill solving ultra-fine powder output bottlenecks
Fineness Range:400–3250 mesh (38–3 μm)
-
Higher yield and better quality
-
Safe and reliable system with PLC/DCS automatic control
-
Automatically controlled grinding roller pressure system
-
Safe and reliable，stable operation
-
Reversible design for easier maintenance and operation
-
Dual limit technology applied for more stable overall machine operation
XZM Ultrafine Powder Mill
Adopts advanced modern grinding technology and specializes in ultra-fine powder processing
Equipped with pulse dust collectors to ensure environmentally friendly production
Fineness Range:325–3250 mesh
-
Stable, Reliable & Eco-Friendly
-
Low Investment, High Efficiency
-
Low Wear, High Fineness
-
Arbitrary Adjustment of Fineness
-
Safe Structural Design
-
Low Power Consumption and Energy Saving
CLASSIC CASES
150,000 Tons/Year Bauxite Powder Production Line
Material: Bauxite
Feed Size: <50mm
Output Size: 200-325 mesh
Capacity: 150,000 tons/year
Equipment:LM Vertical Mill
Bauxite Powder Grinding Production Line
Material: Bauxite
Feed Size: <25mm
Output Size: 200-325 mesh
Capacity: 5-15t/h
Equipment: MTW European Trapezium Mill
800 Mesh Bauxite Powder Production Line Case
Material: Bauxite
Feed Size: 10-20mm
Output Size: 800 mesh
Capacity: 10-15t/h
Equipment: LUM Ultrafine Vertical Roller Mill
Ultra-Fine Bauxite Powder Grinding Production Line
Material: Bauxite
Feed Size: <30mm
Output Size: 800-1250 mesh
Capacity: 3-10t/h
Equipment: XZM Ultrafine Grinding Mill
Get Solution & Price Right Now!
If you would like to receive personalized solutions and a free quote, kindly provide your information below.