What powders can be processed by a vertical tube furnace fluidized bed?

The fluidized bed of a vertical tube furnace can handle a wide range of powder types, including metal, non-metal, ceramic, and composite powder. Its processing effect is reflected in efficient heat transfer, uniform reaction, and flexible operation. The following is a detailed explanation of the types of powders that can be processed and their processing effects:

1. Types of powder that can be processed
metal powder
Iron based powders, such as reduced iron powder and electrolytic iron powder, are used to prepare iron-based alloys or catalyst supports.
Copper based powder: such as electrolytic copper powder, atomized copper powder, used for conductive materials or thermal management materials.
Aluminum based powder: such as atomized aluminum powder and aluminum silicon alloy powder, used for lightweight alloys or 3D printing materials.
Nickel based powders: such as high-temperature alloy powders and cobalt based alloy powders, used in the aerospace or energy fields.
Precious metal powders: such as gold powder, silver powder, platinum powder, used for electronic devices or catalysts.
Non metallic powder
Ceramic powders: such as alumina, zirconia, and silicon carbide, used for refractory materials or structural ceramics.
Polymer powders, such as polyethylene, polypropylene, and polytetrafluoroethylene, are used for plastic processing or coating materials.
Mineral powder: such as quartz powder, kaolin, talc powder, used in the ceramic or paper industry.
Carbon based powders: such as graphite powder, carbon nanotubes, activated carbon, used as battery materials or adsorbents.
Composite material powder
Metal ceramic composite powder: such as aluminum based silicon carbide composite powder, used for high-strength structural materials.
Polymer inorganic composite powder: such as polytetrafluoroethylene filled alumina, used for wear-resistant coatings.
Nanocomposite powder: such as nano titanium dioxide coated diatomaceous earth, used for photocatalysis or environmentally friendly materials.
Special functional powder
Catalyst powder: such as molecular sieves and alumina supported metal catalysts, used in chemical reactions.
Magnetic powder: such as ferrite, neodymium iron boron, used for magnetic materials or motors.
Biomedical powders: such as hydroxyapatite and titanium alloy powders, used for orthopedic implants or drug carriers.

2. Processing effect
Efficient heat transfer and reaction
Fluidized bed utilizes gas blowing to suspend and uniformly mix particles, resulting in a large gas-solid contact area and fast reaction rate.
Case: In the process of iron-based powder oxidation, fluidized bed can achieve higher oxidation efficiency, far higher than fixed bed.
temperature uniformity
The powder is continuously mixed in a fluidized state to eliminate local overheating or temperature gradients, ensuring temperature uniformity in the furnace (temperature difference can be controlled within ± 5 ℃).
Advantage: Avoid clumping or incomplete reaction of powder caused by uneven temperature, and improve product quality stability.
Operational flexibility
By adjusting the gas flow rate or solid circulation volume, the load can be adjusted to adapt to production fluctuations.
Scenario: In catalyst preparation, it is necessary to frequently adjust the powder processing amount to match the reaction progress.
Multi material compatibility
It can handle powders with large differences in particle size and density (such as mixing metal powder with ceramic powder), and is not prone to clogging or segregation.
Case: When preparing metal ceramic composite powder, fluidized bed can achieve uniform mixing of two powders.
Environmental Protection and Energy Conservation
The temperature inside the fluidized bed is uniform, which can effectively suppress the generation of thermal NOx.
Application: Coal fired boilers, waste incinerators and other equipment that meet strict environmental requirements.

3. Typical application scenarios
Catalyst preparation
Scenario: Spray metal salt solution into a fluidized bed and react with carrier powder (such as alumina) to prepare a supported catalyst.
Effect: The active components of the catalyst are evenly distributed, and the activity is improved.
powder metallurgy
Scenario: Preheat metal powder in a fluidized bed and prepare dense parts through high-pressure molding.
Advantages: Preheating uniformity improves part density and reduces subsequent sintering time.
Preparation of 3D printing materials
Scenario: Surface modification of metal or ceramic powders in a fluidized bed to improve their flowability to meet 3D printing requirements.
Effect: Improved powder flowability and increased interlayer bonding strength in printing.
Waste powder recycling
Scenario: High temperature regeneration of waste catalyst powder in a fluidized bed to restore its activity.
Economy: Lower regeneration costs while reducing waste emissions.