A complete industrial production line for metal powder is generally divided into two major process systems: physical methods and chemical methods. The full equipment chain covers five core modules: raw material pretreatment, powder production, powder classification and collection, post-treatment, and finished product packaging and storage. The specific configuration depends on the target powder material, particle size requirements, and production capacity.
I. Raw Material Pretreatment Module
Depending on the powder production process, pretreatment equipment falls into two categories.
1. Pretreatment Equipment for Physical Methods
Coarse crushing equipment: Jaw crushers and cone crushers are used to break metal ingots and scrap into feed sizes below 50 mm.
Pre-grinding and melting equipment: For mechanical comminution, roller crushers and wet ball mills are used to pre-grind material to 1–5 mm. For atomization, medium-frequency induction melting furnaces or electric arc furnaces melt the metal into a liquid state, with operating temperatures ranging from approximately 700°C to 3400°C depending on the metal type. Holding furnaces are used to stabilize the melt temperature. These systems must be operated by personnel with certified qualifications for special equipment, and high-temperature safety procedures must be strictly followed.
Purification equipment: Magnetic separators remove ferromagnetic impurities, ultrasonic cleaning tanks remove oil and surface contaminants from raw materials, and vacuum degassing units remove dissolved gases from the molten metal.
2. Pretreatment Equipment for Chemical Methods
Metal salt solution preparation equipment: Dissolving tanks, stirred reactors, and precision bag filters are used to prepare metal salt solutions at target concentrations.
Impurity removal equipment: Neutralization tanks and solvent extraction towers remove non-target metal ions from the solution.
II. Core Powder Production Module
This is the key stage that determines powder morphology and particle size distribution. Equipment is classified according to the production method.
1. Physical Methods
Atomization equipment:
Gas atomization equipment: High-pressure inert gas nozzle systems, sealed atomization towers, and powder collection chambers use high-speed gas jets to break up a molten metal stream and produce spherical powders. This method is commonly used for steel, aluminum alloy, and superalloy powders.
Water atomization equipment: High-pressure water nozzle systems and atomization towers use water as the atomizing medium. It is lower in cost and widely used for iron-based and copper-based powders.
Rotating electrode atomization equipment: Vacuum atomization chambers, high-speed rotating electrode tips, and arc heating systems produce powder by centrifugal force from molten metal droplets. This method is suitable for high-quality superalloy powders.
Critical components such as gas atomization nozzles, rotating electrode tips, and melt delivery tubes often require non-standard dimensions, materials, and internal profiles depending on the metal type and target particle size. Hansheng Automation can machine these precision parts according to customer-supplied drawings.
Mechanical comminution equipment:
Dry or wet ball mills: Use steel ball impact and grinding to process brittle metal powders in large quantities.
Jet mills: Use high-pressure airflow to accelerate particles and cause them to collide and fracture, producing ultrafine metal powders in the range of 1–10 μm.
Hammer mills: Used for coarse crushing of metal scrap before further processing.
2. Chemical Methods
Liquid-phase reduction equipment: High-pressure hydrogenation reactors and reducing agent delivery systems reduce metal salt solutions into metal powders. For example, carbonyl iron powder is produced using carbonyl decomposition furnaces.
Electrolytic powder production equipment: Electrolytic cells and DC stabilized power supply systems deposit metal powders from metal salt solutions, commonly used for copper and nickel powders.
Vapor deposition equipment: Chemical vapor deposition furnaces are used to produce nanoscale metal or alloy powders.
III. Powder Classification and Collection Module
Air classifiers: Turbo classifiers separate powders of different particle sizes through centrifugal force and provide precise control over particle size distribution.
Cyclone separators and bag filters: Cyclone separators collect coarser powder particles, while bag filters or electrostatic precipitators collect fine particles and prevent dust leakage.
Vacuum conveying systems: Negative-pressure conveying equipment transfers powder between process stages, reducing manual contact and dust contamination.
Inert gas sealed collection chambers: For reactive metal powders such as titanium and aluminum, collection is carried out under nitrogen or argon sealing to prevent oxidation. The working area must meet explosion-proof safety requirements.
IV. Post-treatment Module
Drying equipment: Vacuum drying ovens and spray dryers remove moisture or organic solvents from the powder.
Annealing furnaces: Continuous tubular annealing furnaces or mesh-belt annealing furnaces eliminate internal stress in the powder and improve flowability and apparent density.
Passivation treatment equipment: Passivation tanks and hot-air drying lines apply surface passivation to easily oxidized powders such as zinc and aluminum, improving storage stability. These operations must be conducted in explosion-proof areas with strict control of dust concentration.
Mixing equipment: Three-dimensional mixers and double-cone mixers uniformly blend powders of different particle sizes or compositions to meet customized formula requirements.
For post-treatment systems that handle reactive or abrasive metal powders, customized passivation tanks, sealed hoppers, mixing paddles, and wear-resistant liners may be required. Hansheng Automation can provide precision machining of these non-standard parts based on customer requirements.
V. Finished Product Packaging and Storage Module
Automatic packaging equipment: Vacuum packaging machines and nitrogen-filling packaging machines are used for oxidation-sensitive powders, while ordinary powders can be packed in laminated woven bags.
Storage systems: Sealed explosion-proof silos and constant temperature and humidity storage cabinets are used for flammable or explosive powders such as aluminum and zinc. These storage areas require temperature and humidity monitoring and explosion-proof ventilation systems to prevent moisture absorption and oxidation.
Workshop dust treatment systems: Central baghouse dust collectors and explosion-proof exhaust systems are installed to meet safety and environmental requirements in the production area.
