Bubble alumina 2-3mm

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: