Aluminium Oxide
Aluminum oxide (Alumina) is the most frequently used oxide ceramic material and its applications are extremely broad. Saint-Gobain Performance Ceramics & Refractories utilizes specialty raw materials of the highest purity and density. Bricks made from these materials have extremely low deformation under load. The high purity level of the grain ensures minimal chemical reactions (it is typically the impurities in the grains that will react with furnace contaminants and reduce service temperature of the end product). Saint Gobain is capable of designing and manufacturing a wide variety of shape geometries needed to construct the critical hot face lining of a reactor. Our shapes are made to high dimensional tolerances and exhibit consistent materials properties.
Our Factory
NY TWO GLOBAL has strong presence at refractory & abrasive industry since ten years ago. By combining sources and optimized expert team, we are widening our business into Alloy, Big Bag and retail industries.We have two 100% owned BFA plants and one big bag plant. By investing some other refractory plants, we enhance our position of production and quality control for a better price.Refractory & Abrasive Raw Material: Brown Fused Alumina, White Fused Alumina, White Tabular Alumina, Black Silicon Carbide, Fused Mullite, Bauxite,Fused Magnesia ,Dead Burned Magnesia, Calcined Alumina etc. Alloy: High-Medium-Low Carbon Ferro Manganese, High Carbon Ferro Chrome, Low Carbon Ferro Chrome, Silico Manganese, Ferro Silicon, Silicon Metal, manganese Metal, Cored Wires,Incoulants,etc.
Why Choose Us
Factory strength
NY TWO GLOBAL has strong presence at refractory & abrasive industry since ten years ago. By combining sources and optimized expert team, we are widening our business into Alloy, Big Bag and retail industries.
Quality control
Real-time data testing and inspecting for each phase of production by our own laboratory.
Our certificate
All our plants meet ISO 9001:2015, ISO 14001:2015 & OHSAS 18001:2007.
Production market
By strong presence in China, India, Turkey, Europe and U.S., we have tight connections with main player in each Industries.
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What is Aluminium Oxide
Aluminum oxide (Alumina) is the most frequently used oxide ceramic material and its applications are extremely broad. Saint-Gobain Performance Ceramics & Refractories utilizes specialty raw materials of the highest purity and density. Bricks made from these materials have extremely low deformation under load. The high purity level of the grain ensures minimal chemical reactions (it is typically the impurities in the grains that will react with furnace contaminants and reduce service temperature of the end product). Saint Gobain is capable of designing and manufacturing a wide variety of shape geometries needed to construct the critical hot face lining of a reactor. Our shapes are made to high dimensional tolerances and exhibit consistent materials properties.
Benefits of Aluminium Oxide
Low-iron content
Aluminum oxide has low iron content, which prevents the abrasive from leaving rust on a part's surface. Rust deposits lead to issues in future processes, like pitting or increased repair costs, making aluminum oxide a safe choice for stripping and finishing.
Recyclability
When using aluminum oxide in the blasting process, it's durable enough to withstand multiple passes. Reclaiming this material for multiple uses allows you to maximize your investment and makes aluminum oxide highly cost-effective. Aluminum oxide can also be recycled back to some manufacturers for repurposing, which reduces disposal costs and environmental impact.
High toughness
Aluminum oxide has higher toughness than most other abrasives, especially brown varieties. This toughness leads to less particle shatter and results in lower dust levels. While personal protective equipment (PPE) is often required for abrasive blasting, aluminum oxide's low dust production makes it optional.
Varying grit sizes
This blasting media offers project versatility with different grit sizes. Choose larger grits to create a consistent surface. Finer grits are suitable for detailed surface work, like removing irregularities and reaching into grooves and cracks. You can fine-tune your surface finish with hundreds of grit size and grain shape combinations.
Types of Aluminium Oxide
Calcium aluminate (CaAlO3)
Calcium aluminate (CaAlO3) is an aluminate ceramic used in refractory cements and shapes, as well as synthetic slag additions for metallurgical operations.
Sapphire
Sapphire is a high-purity and high-density, single-crystalline form of aluminum oxide that may contain chromia, titania, yttria, or other dopants. Sapphire is usually transparent or translucent.
Zirconia-toughened alumina (ZTA)
Zirconia-toughened alumina (ZTA) and other zirconia-alumina ceramics are often used in wear applications as an intermediate solution between alumina and zirconia. ZTA offers increased fracture toughness over alumina at a lower cost compared to pure or high zirconia ceramics.
Application of Aluminium Oxide
Medical industry
The chemical properties of aluminium oxide, as well as its hardness and bio-inertness make it a suitable material for various medical applications, including bionic implants, tissue reinforcement, prostheses, hip replacement bearings, etc.
Protective equipment
The lightweight qualities and the strength of aluminium oxide make it a great choice for enhancing body and vehicle armors, as well as creating synthetic-sapphire bulletproof ballistics and windows.
Electrical industry
The high boiling and melting points of aluminium oxide make this compound a great choice for manufacturing of high-temperature furnace insulation, as well as electrical insulators. Alumina is also widely used in the microchip industry.
Gem industry
Aluminium oxide is used in the process of formation of sapphires and rubies. In its crystalline form, or corundum, alumina is the base element for the creation of these two precious gems.
Industrial application
Because aluminium oxide is chemically inert, it is the perfect filler for bricks, plastics, and heavy clayware. It is also often used as the abrasive component of sandpaper, and an economical replacement for industrial diamonds.
Reaction with sodium hydroxide
Aluminium oxide reacts with sodium hydroxide to produce sodium aluminate and water. This reaction takes place at a temperature of 900-1100°C. Salt and water are obtained in this reaction in which aluminium oxide acts as an acid.
Reaction with sulphuric acid
Metal oxides are generally basic in nature but aluminium oxide is amphoteric oxide.Hence it acts both as acid and base. In this case, it acts as a base.
Reaction with hydrochloric acid
Aluminium oxide contains oxide ions, and thus reacts with acids in the same way sodium or magnesium oxides do. Aluminium oxide reacts with hot dilute hydrochloric acid to give aluminium chloride solution.
How to Choose Aluminium Oxide
Color
Aluminum oxide comes in three colors - white, pink and brown - and each color has a set of qualities that are better for some applications than others. White and pink work best for creating a smoother finish. White works best for lacquers and woods for its precision performance and lower heat generation. Pink is ideal for sharpening, grinding and soft wood.Brown has a stronger grain that takes longer to deteriorate than its pink and white counterparts. This higher durability makes it better suited to hard materials.
Grit Size
While the aluminum oxide color affects the abrasive's capabilities, you'll also want to consider grit size. A finer grit size will be more effective for reaching grooves, cracks and surface irregularities. Larger grits are better for consistent surfaces or less detailed surface work.
Synthesis of Aluminium Oxide
First, bauxite ore, the primary source of aluminum, is mined and subsequently crushed and ground to a fine powder to facilitate aluminum oxide extraction. The bauxite is then subjected to digestion, a high-pressure process involving a hot concentrated solution of sodium hydroxide (NaOH), which dissolves the aluminum oxide while leaving impurities behind. After digestion, a clarification and separation step removes solid impurities, resulting in a clear sodium aluminate solution. Precipitation occurs by reducing the solution's pH through carbon dioxide (CO2) addition, causing the precipitation of aluminum hydroxide. Following filtration, the precipitated aluminum hydroxide undergoes calcination at high temperatures to yield alumina in the form of a fine white powder. Additional refining processes may be employed to achieve the desired purity for specific applications. The final alumina product is stored, transported, and utilized in various industries. It serves as the primary feedstock for aluminum production, where it undergoes electrolytic reduction in the Hall-Héroult process to produce aluminum metal. Environmental concerns related to waste generated during alumina production, such as red mud residue, emphasize the importance of proper waste management and sustainable production practices.
Safety Precautions Of Aluminium Oxide
Fine dust or powder of aluminum oxide can be harmful if inhaled. Prolonged exposure to high concentrations of airborne aluminum oxide particles can lead to respiratory irritation, lung issues, and potential long-term health concerns. Adequate ventilation and the use of appropriate respiratory protection are important when working with fine particulate forms of aluminum oxide, such as in industrial or abrasive applications.
Contact with the skin or eyes may cause irritation. It is advisable to wear protective clothing, gloves, and eye protection when handling aluminum oxide, especially if there is a potential for skin or eye contact.
While aluminum oxide is generally recognized as safe when ingested in small quantities (it is used as an anti-caking agent in food products), swallowing large amounts of aluminum compounds can lead to health issues. Chronic ingestion of excessive amounts of aluminum has been linked to certain health concerns, including potential neurotoxicity and bone disorders.
Aluminum oxide is not considered environmentally hazardous, but like other industrial materials, its disposal should be managed properly to minimize its impact on the environment.
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