0.2-1mm 0.5-1mm 1-2mm 2-3mm 3-5mm Activated Alumina Hollow Ball with White Color

Lower price Activated alumina hollow ball Alumina Sphere/ bubble balls 0.2-1mm, 0.5-1mm, 1-2mm, 2-3mm, 3-5mm

Activated Alumina hollow Ball is a new type of high-temperature heat insulation material. Alumina hollow ball is a new type of light-weight, high-temperature-resistant and heat-insulating refractory material. It melts industrial alumina with a content of more than 98% in a three-phase electric arc furnace. Melt use compressed air to blow the molten liquid alumina into hollow spheres to obtain alumina hollow spheres.

The crystal type is a-Al2O3 microcrystals. With alumina hollow ball as the main body, it can be made into various specifications of refractory lightweight products, the highest use temperature is 1800℃, the mechanical strength is high, the thermal conductivity is low, and the performance is stable in various atmospheres. It has been widely used in high temperature and ultra-high temperature furnaces such as petrochemical industry gasifiers, carbon black industrial reaction furnaces, metallurgical industry induction furnaces, etc., and has achieved very satisfactory energy-saving effects.

There are two types of alumina hollow balls: mixed ball and graded ball:

Mixed ball level: 0.2-5mm

Grading ball level: 0.2-1mm, 1-2mm, 2-3mm, 3-5mm.

Alumina hollow ball broken percent:

For smaller one less than usually don't broken;

For 1-5mm the brokend percent is less than 15%, usually 13%.

Lower price Activated alumina hollow ball Alumina Sphere/ bubble balls 0.2-1mm, 0.5-1mm, 1-2mm, 2-3mm, 3-5mm

Activated alumina hollow ball specification

Activated alumina hollow ball advantages

1. High operating temperature:

It can reach above 1750 degrees, with good thermal stability. The reheating line has a small change rate and can be used for longer.

2. Optimize the structure and reduce the weight of the furnace body:

The bulk density of heavy bricks currently used with high temperature resistant materials is 2.6-3.0g/cm, while alumina hollow ball bricks are only 1.1~1.5g/cm. For the same volume of one cubic meter, the use of alumina hollow ball bricks can reduce 1.1- 1.9 tons weight.

3. Save materials:

To reach the same operating temperature, the use of alumina hollow ball bricks and heavy bricks can save 1.1-1.9 tons of heavy bricks per cubic meter, and can save 80% of refractory insulation materials.

4. Energy saving:

Alumina hollow balls have obvious thermal insulation properties, low thermal conductivity, reduce heat dissipation, can play a good thermal insulation effect, improve thermal efficiency, and achieve the purpose of saving energy. The energy saving effect can reach more than 30%.

Lower price Activated alumina hollow ball Alumina Sphere/ bubble balls 0.2-1mm, 0.5-1mm, 1-2mm, 2-3mm, 3-5mm

 Activated alumina hollow ball Production

The formation process of the hollow ball is that the alumina melt is sprayed with high-pressure air and completed within 10 to 30 seconds. The ball formation process is actually a rapid cooling and shrinking process. The melting point of alumina is 2050℃, and the temperature suitable for blowing should be higher than the melting point of 200~300℃, which means it needs to be heated to 2200~2300℃. If the temperature of the melt is low and the viscosity is high, it is easy to blow into thick-walled balls or honeycomb-shaped hollow balls.

Blown alumina hollow balls are divided into 3 stages:

1. It is the melting stage, which increases the temperature and reduces the viscosity of the melt;

Second, it is the blowing stage;

Third, it is the cooling and solidification stage.

The formation of alumina hollow balls is a process of rapid cooling volume shrinkage change of alumina high temperature melt after spraying. These small droplets fall in the air in a parabolic path. During this movement, the small droplet first forms a small ball under the action of surface tension and centrifugal force.

Production process of alumina hollow ball

When the small sphere is quenched, the surface instantaneously solidifies, while the inside of the sphere is still in a liquid state. Under the action of centrifugal force, the melt also produces a large volume shrinkage, so that the melt is quickly and uniformly solidified in the hollow On the outer shell of the ball, the whole process of forming the hollow ball is thus completed.

The internal shrinkage of the hollow sphere is due to the volume expansion of the alumina during the heating process. Although alumina only has a linear expansion of 1.6%~1.8% when heated to 1800℃, when the oxide is heated to the melting point temperature, when the substance changes from a solid phase to a liquid phase, it will produce a volume expansion of 20%~40% .

This volume expansion is related to the chemical bonds of the molecules. When the chemical bond in the molecule, such as the ionic bond, the larger the volume difference between the melt and the solid, the larger the covalent bond component, the smaller the volume difference. When alumina changes from a solid phase to a liquid phase, the molar volume expands by about 23.5%. Therefore, thermal expansion and contraction are the fundamental reason for the formation of alumina hollow spheres.

When blowing alumina hollow spheres, the melt temperature of Wuhan alumina hollow spheres fluctuates between 2200-2300°C. Alumina in a high-temperature liquid state has a greater thermal expansion rate. The coefficient of linear expansion of high-temperature liquids is generally 3 times that of the solid state. The partial pressure of the gas contained in the high-temperature liquid, which accelerates the expansion of the high-temperature liquid, is an important factor in promoting the formation of hollow alumina spheres.

There are two main aspects that form the partial pressure of the gas inside the high-temperature melt:

First, during the electric melting process, when adding powdered industrial alumina, part of the air brought in during the operation will still have some gas remaining in the high-temperature melt after the electric melting, forming honeycomb pores during the cooling process ;

Second, during the electric melting process, various oxides, especially low melting point oxides, gradually increase the volatilization rate during the electric melting process. The volatilization of this molten liquid can increase the gas partial pressure inside the liquid. For example, alumina begins to volatilize above 1750°C, and the amount of volatilization increases above 2300°C.

During the electric melting process, 30%-40% of the silica impurities in industrial alumina will be volatilized, and other low-melting impurities such as potassium, sodium, boron and other oxides will be volatilized in a larger proportion.

Activated alumina hollow ball Usage

Alumina hollow ball is a new type of high-temperature heat insulation material. It is obtained by placing industrial alumina with an alumina content of more than 98% in an electric arc furnace for high-temperature melting, and blowing liquid alumina into air pellets with compressed air. 

Alumina hollow balls can be made into products of various shapes. The use temperature is 1800 degrees Celsius. The product has high mechanical strength, which is several times that of general lightweight products, and the bulk density is only one-half of corundum products.

What are the uses of alumina hollow balls

Alumina hollow ball use

1. Alumina hollow ball and its products are a kind of light refractory material with excellent high temperature resistance and energy saving.

2. Alumina hollow ball is an ideal heat insulation filling material for high temperature kilns, heat insulation and energy saving refractory material. It can be used as high-temperature, ultra-high-temperature insulation filler, high-temperature refractory concrete lightweight aggregate, high-temperature castable, etc.

3. Alumina hollow spheres are widely used in high temperature and ultra-high temperature furnaces such as petrochemical industry gasification furnaces, carbon black industrial reaction furnaces, metallurgical industry induction furnaces and so on.

4. Alumina hollow ball refractory bricks can be used in high-temperature energy-saving (>30%) industrial furnaces. For reducing the weight of the furnace body, the structure can be modified, materials can be saved, and energy can be saved.

Lower price Activated alumina hollow ball Alumina Sphere/ bubble balls 0.2-1mm, 0.5-1mm, 1-2mm, 2-3mm, 3-5mm

Activated alumina hollow ball Packaging
1.25 kg woven bag, 40 woven bags/tons bag.
2.25kg woven bag, 40 woven bags/pallet
3.25kg paper bag, 40 paper bags/pallet
4.25kg paper bag, 40 paper bags/carton
5.Can make the package according to customer's requirements.

Activated alumina hollow ball Shipping
1.FEDEX/DHL/UPS/TNT for samples.
2.By Sea for batch goods.
3.Customers specifying freight forwarders or negotiable shipping methods!
4.Activated alumina hollow ball Delivery Time:
(1)Samples:3 days for common shape samples;15 days for special shape samples.
(2)Batch goods:Within 7-10days for in stock alumina hollow balls from ordering shipping space to deliver goods and within20-30 days for NO in stock alumina hollow balls.

Payment Terms
(1)T/T, Western Union,LC;
(2)Usually 30% deposits,70% balance to be paid before delivery or against copy of BL or negotiations
Others
MOQ: Usually 1 container, MOQ 1Tons, Customers can order certain weight for Activated alumina hollow ball.

Lower price Activated alumina hollow ball Alumina Sphere/ bubble balls 0.2-1mm, 0.5-1mm, 1-2mm, 2-3mm, 3-5mm

Henan hongtai kiln refractory co., LTD. is well aware that there are thousands of demands from customers, which can be summarized in four aspects: reliable quality, timely delivery, reasonable price and considerate service.The company will continue to adhere to the corporate spirit of "contributing to society and serving customers" and the business philosophy of "mutual benefit, win-win, integrity, efficiency, preciseness and responsibility".

Henan hongtai kiln refractory co., LTD. Main products are high alumina brick, clay brick, azs fused zirconium corundum brick, fireproof ball lightweight insulation brick, Light weight alumina hollow ball brick, wear-resistant pouring material, corundum pouring material, low cement high strength pouring material, impermeable material, self-flowing material, plastic material, and various types of refractory materials.

Henan hongtai kiln refractory co., LTD. : "quality first, reputation first, customer first: it is our aim."Scientific management, strong technical force, perfect testing means, advanced technological equipment and stable product quality are the guarantee of quality service.Henan hongtai kiln refractories co., LTD sincerely hopes to cooperate with you hand in hand and in good faith.

Lower price Activated alumina hollow ball Alumina Sphere/ bubble balls 0.2-1mm, 0.5-1mm, 1-2mm, 2-3mm, 3-5mm

Q1:Are you a manufacturer or trader?
A:Factory+trade(mainly factories,meanwhile,we operates other related products)
Q2:What's the MOQ of trial order?
A:No limit, We can offer the best suggestions and solutions according to your needs.
Q3:After an order is confirmed,when deliver?
A:15-25days after deposit; if customer sized, 35days.
Q4:Which payment terms can you accept?
A:T/T,L/C,Western Union,Moneygram,Paypal are available
Q5:How about your company's certification?

A:ISO9001 and Test Report,also we could apply other necessary certification.
Q6:Can you offers samples?
A:Of course, samples are free but freight paid by the buyers.
Q7: What is the service life of your bricks?

A:Depend on brick types, using conditions and methods.

Q8: Can we visit your factory?
A:Of course,welcome to visit at any time. Seeing is believing.
Q9:How to solve the quality problems?
A:If the products have quality problems, we will be responsible to offer compensation.

Hongtai Kiln Refractory has professional sales and after-sale service team who provide customers all-around service about product selection, transportation, installation and operation technology training etc. Now we have established cooperation relationship with many science and research units and our products have been sold to Vietnam, Thailand, Malaysia, South Korea, Pakistan, Kazakhstan, India, Japan, Indonesia, Germany, Italy, Mongolia, Russia, Argentina, colombia, Egypt, South Africa and etc.

We has over 20 years experience on producing Lower price Activated alumina hollow ball Alumina Sphere/ bubble balls 0.2-1mm, 0.5-1mm, 1-2mm, 2-3mm, 3-5mm.

Payment Guarantee: If couldn't trust us at first order, could use trade Assurance.

Jerry Li         

Cell&WhatsApp: 0086-13373957739 

Skype: live:.cid.b12dd76d43ac731e

Email: jerry(at)firebricks-supplies.com