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Alumina

Yishengjia: Your Professional Alumina Manufacturer!

 

 

Zibo Yishengjia Aluminum Co., Ltd. is mainly engaged in the production of alumina series products. Our company has a strong technical force, advanced technology, sophisticated equipment, and complete testing equipment. We specialize in the production of special aluminum hydroxide, high-purity alumina, activated alumina, etc. These products are widely used in insulation materials, polishing materials, colored glazes, luminescent materials, transparent ceramics, building materials, refractory materials, and other industries.

 

 
Our Advantages
 
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Strict Quality Management
Our company strictly implements ISO9002 quality management standards and has established a complete quality management system to ensure the long-term stability of product quality.

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Efficient Service
Our production is efficient and reliable, so we deliver on time and within delivery deadlines. At the same time, our team is always happy to help customers and strive to solve customer problems in a short time.

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Competitive Price
We have long-term services in wholesale alumina, high-temperature alumina, and other products, and have established long-term and stable cooperative relationships with many retailers and agents to provide our customers with reasonably priced products.

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OEM Available
Our employee team has high R&D capabilities, superb design and development capabilities, skilled manufacturing technology, and rich product application experience, and can also meet OEM business needs.throughout the entire industry chain.

 
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Introduction to Alumina

Alumina, synthetically produced aluminum oxide, Al2O3, a white or nearly colourless crystalline substance that is used as a starting material for the smelting of aluminum metal. It also serves as the raw material for a broad range of advanced ceramic products and as an active agent in chemical processing.

X-type Zeolite Powders For Molecular Sieves

 

Types of Alumina
Aluminum Sulfate for Water Treatment
Low Sodium Pseudo Boehmite
Fake Boehmite
Aluminum Sulfate for Dyestuff

Super Fine Aluminum Hydroxide
Super fine aluminum hydroxide refers to an extremely finely ground or micronized form of aluminum hydroxide, which is a compound with the chemical formula Al(OH)₃. This substance is a white, crystalline powder that is virtually insoluble in water. It is commonly used in various industrial applications, such as plastics, rubber, adhesives, flame retardants, and pharmaceuticals.
Calcined Alumina
Calcined alumina is aluminum oxide that has been heated at temperatures in excess of 1,050 °C (1,900 °F) to drive off nearly all chemically combined water. In this form, alumina has great chemical purity, extreme hardness (9 on the Mohs hardness scale). By controlling the calcination temperatures and time, the properties of the alumina can be controlled. Calcined alumina is therefore utilized in a variety of industrial applications including Structural ceramics, Technical ceramics, Polishing compounds for plastic, metal, and glass, Fillers for Rubber and Plastics, Friction – anti slip, Refractories, Paint & Coatings and Thermal Spray Powders.
Hydraulic Alumina
Hydraulic alumina typically refers to a type of aluminum oxide that exhibits hydraulic properties. The term "hydraulic" implies that this alumina has the ability to set and harden under water or in the presence of moisture. This property is similar to hydraulic cements, which undergo a chemical reaction with water to form a solid, durable mass. Hydraulic alumina is used in specific applications where its ability to set in the presence of water is advantageous. This can include applications in construction, where materials need to cure or harden in wet conditions.
Nano Alumina Powder
These are nanosized spherical particles from an alumina bulk. Alumina nanoparticles can be obtained by several methods including, pyrolysis, sputtering, sol gel and the most commonly preferred technique laser ablation. Laser ablation is convenient since it can be performed in the gas, liquid or even a vacuum environment. This is very advantageous since the collection of nanoparticles in a gaseous environment is harder and cumbersome than in a liquid. It is also easier to set specifications for the kind of nanoparticles you desire to obtain. Aluminum nanoparticles are usually found in two states, nearly spherical shaped individual particles or as oriented fibers. The properties of bulk alumina that allow it to be such a versatile element in the industry are different from those of its nanoparticles. Bulk aluminum’s large diameter doesn’t allow it to have a larger surface of interaction with its surroundings. Thus, the applications of its use can't efficiently be further expanded to other areas like catalysis or adsorption. Branching into the field of nanoparticles paints a new picture for the possible applications of the already useful and abundant compound of aluminum oxide. The decrease in size has various advantages but the important factor is the change in the chemistry of the nanoparticles compared to their larger counterparts that fascinates the incorporation of these nanoparticles into many fields of science and engineering.

 

 

Properties of Alumina

 

The Role Of 4A Zeolite in Detergent

Temperature Stability

Alumina has an extremely high temperature stability and the ability to withstand atmospheric temperatures of 2900℉ or 1650℃, as well as vacuum temperatures of up to 3000℉ or 2000℃. Parts and components made using alumina retain 50% of their room temperature tensile strength at 1000℃.

Aluminum hydroxide

Abrasion Resistance

Abrasion is the act of wearing down a material through friction, altering its structure and reducing its applicability in required conditions. Alumina features a very high hardness, making it very resistant to abrasion and other types of mechanical wear and tear. This means that parts and components made from alumina will retain their desired properties and shape far longer.

Preparation of ultrafine aluminum hydroxide

Chemical Resistance

Alumina is chemically inert, not reactive, which means it’s highly resistant to different types of chemicals, including alkalis and acids. Alumina will not sustain surface and structural damage from being exposed to salt and solvent solutions at high temperatures, which further extends the durability and longevity of different parts and components.

Hydrated alumina

Density

Material density is its mass divided by its volume and it’s expressed in g/cm3, or grams per cubic centimeter, meaning that the material density and volume are inversely proportional. Alumina consists of fine particles without voids present in the material, and the fewer the voids, the higher density and volume. The density of alumina is different at different temperatures, with the standard density being 3.965 g/cm3 at the temperature of 25℃.

 

Analysis On The Application Of 4A Zeolite in PVC

 

Application of Alumina

Abrasives
Alumina is widely used in a variety of industrial abrasive materials, owing to its superior hardness and strength. Similarly, alumina can be used as a coating to protect against abrasion.
Refractories
Alumina is also widely used in refractory products, due to its high melting point. It is especially suited to demanding applications where the strength of the refractory must be retained at high temperatures.
Glass
Alumina is often used in the production of glass products, lending improved strength; it has even been studied for its potential in creating an unbreakable glass.
Engineered Ceramics
Alumina is also widely used in engineered ceramics, also called advanced or technical ceramics. These engineered ceramic materials are formulated for especially harsh applications that require increased wear resistance, thermal and chemical stability, and many of the other characteristics alumina possesses. Engineered ceramics have applications in industries from chemical and medical, to industrial, electrical, and more.

 

Uses of Alumina in the Field of Ceramics
 

Refractory Material

One of the most significant applications of alumina in the ceramics industry is as a refractory material. Due to its high melting point, alumina is used as a lining material in high-temperature furnaces and kilns. Alumina also provides excellent thermal shock resistance, making it an ideal material for use in refractory applications.

 

Ceramic Substrates

Alumina is widely used as a substrate material in the production of electronic components, such as microchips and circuit boards. Alumina substrates are highly resistant to thermal and mechanical stresses, making them ideal for use in harsh environments. Additionally, alumina substrates provide excellent electrical insulation and high thermal conductivity.

 

Grinding Media

Alumina is also used as a grinding media in the ceramics industry. The hardness and wear resistance of alumina make it an ideal material for use in grinding applications. Alumina grinding media are used in ball mills, vibratory mills, and other types of grinding equipment.

 

Biomedical Applications

Alumina ceramics are widely used in the biomedical industry due to their excellent biocompatibility and resistance to wear and corrosion. Alumina ceramics are used to manufacture dental implants, joint replacements, and other medical devices.

 

High-Wear Applications

Alumina is highly resistant to wear and abrasion, making it an ideal material for use in high-wear applications. Alumina ceramic components are used in a variety of industrial applications, including wear plates, cutting tools, and pump components.

 

Insulating Material

Alumina is an excellent insulating material, making it ideal for use in high-temperature and high-voltage applications. Alumina ceramics are used in the production of heating elements, electrical insulators, and other electrical components.

 

Ultimate FAQ Guide to Alumina
 

Q: What is Alumina made of?

A: Alumina is made from bauxite, a naturally occurring ore containing variable amounts of hydrous (water-containing) aluminum oxides. Free Al2O3 occurs in nature as the mineral corundum and its gemstone forms, sapphire and ruby; these can be produced synthetically from alumina and in fact are occasionally referred to as alumina, but the term is more properly limited to the material employed in aluminum metallurgy, industrial ceramics, and chemical processing.

Q: What is alumina vs aluminium?

A: Aluminum is the most abundant metal in the crust of the Earth—but it doesn't exist in its pure form in nature. Bauxite ore first needs to be mined, then alumina is extracted from the bauxite, then the alumina is smelted into aluminum. Alumina is aluminum oxide (Al2O3).

Q: Is alumina safe for the skin?

A: In skin care preparations, alumina is used in amounts up to 25%. It's been determined safe as used in cosmetics by the independent Cosmetic Ingredient Review panel. It is also approved by the U.S. Food and Drug Administration as a color additive for use in certain over-the-counter drugs.

Q: What is alumina good for?

A: Alumina is the common name of the ingredient aluminum oxide. It is a naturally occurring mineral used as an abrasive, a thickener, and an absorbent in cosmetics. Alumina is sometimes used as part a coating blend for nano-sized mineral UV filters such as titanium dioxide.

Q: Is alumina durable?

A: Alumina is a well-balanced material. It has the same sintered crystal body as sapphire and ruby. It has been used for decades in electrical components for its high electrical insulation, and is widely used in mechanical parts for its high strength, and corrosion- and wear-resistance.

Q: What is alumina made from?

A: The principal raw material for alumina production is bauxite Al2O(OH)4, an abundant hydrated rock occurring as large deposits in various parts of the world.

Q: How long does alumina last?

A: Alumina has unlimited shelf life but it has to be stored under the right conditions as it will absorb moisture at the first opportunity, so alumina producers prefer to ship it off to smelters as soon as possible.

Q: Is alumina corrosive?

A: While aluminium doesn't rust, it does corrode. The aluminium oxide coating is highly resistant and renews itself if damaged keeping the metal relatively safe from corrosion. But some factors can cause the coat to become unstable, thus exposing the metal.

Q: Is alumina a natural material?

A: Alumina is made from bauxite, a naturally occurring ore containing variable amounts of hydrous (water-containing) aluminum oxides.

Q: Why is alumina hard?

A: Alumina is a well-balanced ceramic derived from the polymorphic alpha- (α-) phase mineral corundum, sharing the crystalline structures of sapphire and ruby: Al2O3. Consequently, it is one of the hardest engineered ceramics; second only to silicon carbide (SiC).

Q: Is alumina ceramic safe?

A: Alumina ceramic, composed mainly of aluminum oxide (Al2O3), is widely regarded as safe for various applications due to its biocompatibility, thermal resistance, and electrical insulation properties. Used in medical implants and dental applications, it is well-tolerated by the body.

Q: Is alumina FDA approved?

A: Alumina has been approved by the FDA for use in medical devices. The alumina used in these devices must comply with ASTMF603-12, “Standard Specification for High-Purity Dense Aluminum Oxide for Medical application”.

Q: Which is better silica or alumina?

A: Alumina is better than silica in applications that require high thermal stability, adsorption capacity, and mechanical strength. Alumina is also more effective in high-temperature and high-humidity environments.

Q: Does alumina absorb water?

A: Activated alumina can also absorb moisture from the air, which makes it ideal for use as a desiccant. At a relative humidity of 50 percent, activated alumina can adsorb nearly 20% of its own weight in water.

Q: What is Alumina Ceramic?

A: Alumina ceramics are technical ceramics due to their properties and price to performance ratio. The classification of alumina ceramics is based on their alumina content, which can vary from 70% to 99.9%. The higher the purity of alumina, the stronger is its wear and corrosion resistance.

Q: Why alumina is used in cement?

A: Aluminous cement is a quick binder with special properties. It is used primarily to make non-standard monolithic components exposed to high temperatures, + 1300°C. It is also a component of adhesives and mortars. It has a very short setting time.

Q: Why is alumina a bad conductor?

A: Alumina, also known as aluminum oxide, is a poor conductor of electricity because it is a ceramic material with a highly stable crystalline structure. This structure does not allow for the easy movement of electrons, which is necessary for conducting electricity.

Q: What is alumina used for?

A: Alumina (Aluminium Oxide) is the most widely used oxide ceramic material. Its applications are widespread, and include spark plugs, tap washers, abrasion resistant tiles, and cutting tools.

Q: What are the advantages of aluminum oxide?

A: ● Alumina is an excellent electrical insulator, which can resist extremely high current, and its electrical resistance increases with the increase of its purity. The higher the purity of alumina is, the higher the resistance is.
● Alumina has a very high melting point and strong mechanical strength. However, when the temperature exceeds 1000 degrees Celsius, its mechanical strength decreases. Because of its great difference in thermal expansion coefficient, its thermal shock resistance is not very effective when exposed to very high temperatures.
● Alumina has excellent chemical stability and high corrosion resistance.
● Alumina is slightly soluble in strong acids (such as hot sulfuric acid and hot HCl and HF) and alkaline solutions, but insoluble in water. Pure alumina can resist chemical corrosion, which makes pure alumina become the main choice of engineering components in many industrial applications. Its resistance to chemical corrosion has been proved to be due to its low solubility in these chemicals.
● Alumina ceramics have the lowest steam and decomposition pressure.

Q: What is activated alumina?

A: Activated alumina is a porous, granular substance that is used as a substrate for catalysts and as an adsorbent for removing water from gases and liquids. Smelter-grade alumina accounts for 90 percent of all alumina produced; it is transported to aluminum plants, where it is electrolyzed into aluminum metal. Calcined alumina is made into a variety of ceramic products, including spark-plug insulators, integrated-circuit packages, bone and dental implants, laboratory ware, sandpaper grits and grinding wheels, and refractory linings for industrial furnaces. These products exhibit the properties for which alumina is well known, including low electric conductivity, resistance to chemical attack, high strength, extreme hardness (9 on the Mohs hardness scale, the highest rating being 10), and high melting point (approximately 2,050 °C, or 3,700 °F).

Q: What is the application of alumina in biomaterials?

A: Alumina has 40 years of clinical record in the field of orthopedics, where it is used in the manufacture of balls and cups for hip replacements and has proven its effectiveness in limiting the bearing wear.

Q: How is aluminium oxide produced?

A: Aluminium oxide is often produced by the Bayer process, which means refining bauxite to produce alumina. This process starts by drying crushed and washed bauxite, usually containing 30–55% Al2O3. The bauxite is dissolved in caustic soda to form a slurry, heated to temperatures of about 230–520 °F (110–270 °C). This mixture is then filtered to remove the residue called the “red mud” impurities. The filtered alumina solution (aluminium hydroxide) is then transferred or pumped into precipitator tanks where it cools and starts to seed. These seeds stimulate a precipitation process allowing solid aluminium hydroxide crystals to be formed. All the aluminium hydroxide that settles at the bottom of the tank is removed. The remaining caustic soda is washed away from aluminium hydroxide, which undergoes various levels of filtering. Finally, it is heated to completely remove excess water. After passing through a cooling stage, the fine white powder is produced.

Q: What are the commercial grades of Alumina?

A: There are many different commercial grades of alumina. Examples include smelter-grade, calcined, low soda, reactive, tabular, fused, and high-purity.
● Smelter alumina is used in the manufacture of aluminum metal, typically in fluid bed or fluid flash calciners.
● Calcined alumina may use mineralizing catalysts and contain sodium oxide as the main impurity. They improve the performance of both shaped and monolithic refractories.
● Low soda alumina is used mainly in electrical and electronic components.
● Reactive alumina has a relatively high purity and small crystal size. It is used in the production of high-performance refractories that require defined particle packing and consistent placement characteristics.
● Tabular alumina is re-crystallized or sintered alpha alumina. It is used in shaped and unshaped refractories for steel, cement, foundry, glass, petrochemical, and waste incineration applications. Non-refractory applications for tabular alumina include its use in kiln furniture and for metal filtration.

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