Bubble alumina 2-3mm

Bubble alumina 2-3mm is a lightweight refractory material with high-temperature resistance and excellent energy saving. Bubble alumina products are made of industry alumina powder, the primary raw material melted in an electric arc furnace at 2200℃. It belongs to ultra-high temperature material, energy-saving thermal insulation material. Bubble alumina has excellent insulating properties and high hot strengths. Typical applications for Bubble alumina bricks include gas or electrically heated kilns, furnaces, glass-making industries, insulation of kiln brick and ceramic tile linings in gas turbines, backup linings in reactors, and working linings in manufacturing high-purity quartz for the electronics industry.

Bubble alumina 2-3mm production process:

Bubble alumina, the fusion process involves melting the industry alumina powder in an electric arc furnace at temperatures above 2000ºC and pouring the material out of the furnace through a high-pressure air stream. The molten stream is transformed into a barrage of particles that rapidly cools as the particles fly across the contained area in front of the furnace. Surface tension causes these molten particles to form perfect spheres as they are blown across the room. As the bubbles get farther from the furnace, the exterior of the spheres cools more rapidly than the interior. This results in the walls shrinking away from the center of each particle, leaving an open core inside. The open core provides the lightweight insulating properties of the bubbles, which exhibit extremely fine crystals resulting from the rapid cooling. By the time the particles moved enough from the pouring spout, they had solidified and were firm hollow spheres. The size distributions of the bubbles are controlled by the velocity of the air stream and typically range from 5 mm to 100 microns.

Application of bubble alumina 2-3mm:

Bubble alumina are used in three different types of refractory products—Monolithics, pressed shapes, and loose-fill insulation.

Bubble alumina are used in three different types of refractory products—unshaped refractories (Monolithics), Shaped refractories, and loose-fill insulation.

Mixes containing bubble alumina are used to cast monolithic shapes such as burner blocks for kilns and covers for coreless induction furnaces. They are also used to cast backup linings for many reactors, especially those with hydrogen atmospheres. High-alumina bubbles cast backup linings for secondary ammonia reformers, carbon black reactors, waste heat boiler tube sheets, controlled atmosphere furnaces, and other high-temperature backup linings.

The Insulating Fire-Brick (IFB) that contains high-alumina bubbles is often used as the working lining in ceramic kilns but is primarily used as backup linings in gasifiers for coal and petroleum coke, gas/ oil (with heavy residue feedstock), and industrial waste. These bricks are used in hazardous waste and fluorine processing incinerators, hydrogen generators, auto thermal reactors for methanol production, and ammonia reformers.

Low-silica, low-soda bubbles are currently utilized in higher-end applications. They are used to press ceramic tiles for lining the combustion chambers within gas turbines, resulting in higher engine efficiency and lower emissions (NOx) than metal-shielded combustion chambers and backup linings in sintering furnaces for nuclear fuels. They are also used in both working linings, and backup linings in sintering furnaces for powder metallurgy and metal injection molded parts. They can also be used in the gasifier applications listed previously.

loose-fill insulation
Firing Beds Bedding Material
High Porosity Abrasives

Chemical compositions of bubble alumina 2-3mm:

Chemical compositions Index
Al2O3 (%) ≥ 99
SiO2 (%) ≤ 0.2
Na2O (%) ≤ 0.25
Fe2O3 (%) ≤ 0.15
Maximum Working Temperature (℃) 1850
Granularity (mm) 2.0-3.0

Bubble Alumina(FAQ)

What is your terms of payment?

T/T 30% as deposit, and 70% before delivery. We’ll show you the photos of the products and packages .before you pay the balance.

What is your sample policy?

We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost. 

What does the bulk weight indicate and what impacts the bulk weight?

According to the FEPA, the bulk density of an abrasive is the quotient of the mass and the volume a grain type poured out in a particular manner will occupy. The bulk density, also called bulk weight, is stated in g/cm3. The rounder the particles, the higher the packing density,

What is the specific surface?

The specific surface means the outer surface of a substance including all accessible pores in relation to the mass. It is determined using the Brunauer-Emmett-Teller (BET) method.

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