Introduction
Homogenized bauxite is produced by selecting high-quality bauxite ore as raw material. After grade classification and selection, the ore undergoes processes such as blending based on composition, grinding, iron removal, screening, molding, drying, firing, and other steps. The cross-section appears greenish-black, with a dense texture and well-developed grains, most of which are larger than 15μm. It has the characteristics of stable performance indices, uniform distribution of active components, high bulk density, good high-temperature performance, and requires no further grade sorting or selection during application. It offers comprehensive low cost and high cost-effectiveness and can replace brown corundum and similar products.
Due to its high-temperature resistance, strong corrosion resistance, and high strength, it is used in steel pouring slide gates, processing of rare and precious metals, special alloys, high-purity metals, glass drawing, and the production of laser glass crucibles and utensils. It is also applicable in various high-temperature furnaces and kilns, including refractories, ceramics, and ironmaking blast furnace linings (walls and tubes), as well as physical and chemical apparatus, spark plugs, and heat-resistant, oxidation-resistant coatings. Additionally, it serves as a specialized lining material for carbon black production, boron chemical processes, fertilizer plants, ammonia reaction furnaces, and vaporization furnaces.
Physical And Chemical Specifications
| Product Name | Chemical Composition (mass fraction) % | Bulk Density G/cm³ |
Water Absorption Rate % | ||||
| Al₂O₃ | Fe₂O₃ | TiO₃ | CaO + MgO | K₂O + Na₂O | |||
| Homogenized Material - 85 | ≥85 | ≤1.8 | ≤4.0 | ≤0.5 | ≤0.5 | ≥3.30 | ≤2 |
| Homogenized Material - 88 | ≥88 | ≤1.8 | ≤4.0 | ≤0.5 | ≤0.5 | ≥3.40 | ≤2 |
Advantage
Uniform chemical composition: After homogenization, the fluctuation range of main chemical components such as alumina, silicon oxide, and iron oxide is significantly reduced. This provides stable raw materials for alumina production and other subsequent processes, helping to stabilize both the production process and product quality.
Stable mineral composition: Not only is the chemical composition uniform, but the mineral composition is also more stable. The distribution of minerals such as hydrotalcite, kaolinite, and acicular ferrite becomes more uniform, which improves the reactivity and processing performance of bauxite.
Optimization of physical properties:The particle size distribution is more reasonable and uniform, and physical properties such as porosity and bulk density are also optimized. These improvements enhance the fluidity, stacking, and abrasive characteristics of bauxite, while reducing energy consumption and equipment wear during the production process.
Purpose of Homogenization
Stabilizing chemical composition: During bauxite mining, there are differences in the chemical composition of different ore bodies and layers. Through homogenization, the fluctuation in the content of major components such as alumina, silicon oxide, and iron oxide can be controlled within a narrow range. This helps meet the stringent chemical composition requirements of raw materials for subsequent processes such as alumina production.
Optimization of physical properties: Homogenization can improve the physical properties of bauxite, such as particle size distribution, porosity, and bulk density, making them more uniform and consistent. This contributes to improved grinding efficiency, reduced energy consumption, and better fluidity and reactivity of the material in later production stages.
Improving resource utilization: Bauxite ores of varying grades and properties can be reasonably blended and homogenized, enabling the effective use of low-grade ores and marginal waste. This expands the utilization scope of bauxite resources and enhances the overall resource utilization rate.
Process
Pre-homogenization Yard Method
Bauxite raw materials are stacked into a number of parallel, overlapping layers using a stacker, following a specific stacking method such as the herringbone method. The goal is to ensure that the material quality in each layer is as uniform as possible. During material extraction, the "layer-cutting" method is used - cutting a certain thickness across all layers perpendicular to the direction of stacking - so that the removed material contains components from each layer, thereby achieving homogenization.
Crushing, Screening, and Grading for Homogenization
Bauxite is first crushed using a crusher, then screened using vibrating screens and other equipment to classify ore particles by size. Particles of different sizes are then reasonably matched and mixed based on their chemical composition and physical properties, in order to achieve homogenization.
Ore Homogenization
Different bauxite raw materials with known compositions are accurately proportioned and mixed according to production requirements and target composition. This ensures that the mixed bauxite meets homogenization standards. Typically, a computer control system is used to precisely manage the proportion and flow rate of each raw material to ensure effective homogenization.
Application
Alumina production:
Homogenized bauxite is an important raw material for alumina production. It helps processes such as the Bayer method and sintering method run more stably and efficiently, improving both the output and quality of alumina while reducing production costs.
Refractory material manufacturing:
Homogenized bauxite is used in the manufacture of high-alumina refractory materials, such as refractory bricks and castables. It ensures that these materials maintain stable high-temperature performance, corrosion resistance, and mechanical strength, thereby extending their service life.
Ceramic industry:
In ceramic production, homogenized bauxite serves as a key raw material for adjusting the chemical composition and physical properties of ceramics. It helps enhance the quality and performance of ceramic products by improving hardness, abrasion resistance, and high-temperature resistance.
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