Cenosphere

what is Cenosphere?

Cenosphere (hollow microsphere) is a lightweight, hollow spherical particle composed mainly of silicon aluminum oxide, usually extracted from fly ash from coal-fired power plants.

It is characterized by low density, high strength, high temperature resistance and good thermal insulation performance, and is widely used in building materials, composite materials, coatings, plastic fillers and other fields.

The unique structure of Cenosphere makes it an important choice for lightweight materials and functional additives.

Cenosphere fly ash

Features of Cenosphere

• Lightweight: Cenosphere is a hollow microsphere, mainly composed of aluminosilicate, with a very low density, usually between 0.4-0.8 g/cm³, making it an ideal choice for lightweight filling materials.
• High strength: Despite its light weight, Cenosphere's structure gives it good compressive strength and can withstand certain mechanical stresses.
• Thermal insulation performance: Due to its hollow structure, Cenosphere has excellent thermal insulation properties and is often used in building materials and thermal insulation coatings.
• Chemical resistance: Cenosphere is inert to most chemicals and can remain stable in acidic and alkaline environments.
• Good fluidity: Due to its spherical structure, Cenosphere has good fluidity and is easy to mix with other materials. It is often used in composite materials, coatings and plastics.
• Environmental protection: Cenosphere is a by-product of coal-fired power plants. Using it as a filler can reduce waste and has environmental advantages.

Cenosphere Production Process

• Pulverized coal combustion: Cenosphere is mainly a byproduct of coal-fired power plants. When pulverized coal is burned in power plants, the minerals in the coal melt at high temperatures and form hollow microspheres.
• High temperature melting: When pulverized coal is burned in boilers, the temperature is usually as high as 1200-1600°C, and the aluminosilicates in the coal ash melt at high temperatures to form liquid droplets.
• Rapid cooling: The molten droplets encounter cold air during their rise, quickly cool and solidify into hollow spherical particles, namely Cenosphere.
• Separation and collection: Cenosphere enters the electrostatic precipitator or bag filter through the flue gas, is separated from other fly ash and collected.
• Screening and classification: The collected Cenosphere is screened and classified into different categories according to particle size to meet different industrial needs.
• Cleaning and drying: Some applications require high-purity Cenosphere, so it needs to be cleaned to remove residual ash and finally dried.
• Packaging and Storage: Treated Cenosphere is packaged and stored in a dry environment ready for transportation and use.

Cenosphere price

How to Use Cenosphere 

1. Building Materials

Concrete lightweight filler: Adding Cenosphere to concrete can reduce density and improve thermal and acoustic insulation while maintaining a certain strength.

Usage: Mix with cement and sand in proportion (usually 10%-30%).

Insulation mortar: Used in exterior wall insulation systems to improve insulation effects.

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2. Plastics and Composites

Plastic Reinforcement: Cenosphere can be added to plastics as a filler to reduce material density and improve mechanical properties and processability.

How to use: Directly mix in a ratio of 5%-20% during plastic processing.

Composites: Used to make lightweight, high-strength composites such as automotive parts and aerospace materials.

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3. Coatings and Paints

Thermal Insulation Coatings: Cenosphere is added to coatings to enhance thermal insulation and weather resistance.

Usage: Mix with coatings at a ratio of 3%-10% and stir evenly.

Anti-corrosion Coatings: Used to protect metal surfaces using its chemical resistance.

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4. Refractory Materials

Refractory bricks and castables: Cenosphere can be used to make lightweight refractory materials and improve thermal insulation performance.

How to use: Mix with refractory binder, shape and sinter at high temperature.

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5. Oil Drilling

Drilling fluid additive: Cenosphere can reduce drilling fluid density, relieve formation pressure, and prevent blowouts.

Usage: Add directly to the drilling fluid in a certain proportion (usually 5%-15%) and stir.

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6. 3D printing and mold making

3D printing materials: Add Cenosphere to resin or metal powder to reduce density and improve printing efficiency.

Mold filler: Used in lightweight mold manufacturing to reduce cost and weight.

 

Precautions for use:

 

Particle size selection: Select the appropriate particle size range (usually 10-300 microns) according to application requirements.

Mixing: Make sure Cenosphere is thoroughly mixed with other materials to avoid agglomeration.

Storage conditions: Keep dry and avoid agglomeration due to moisture.

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