Firework aluminium powder test standard
I. Preparation of Materials
To produce aluminum powder fireworks, various materials are required, including aluminum and aluminum foil, black pyrotechnic matches, spices, pigments, catalysts (such as titanium dioxide), chemical waste (such as sodium sulfate and sodium nitrate), and sparks. Among them, aluminum powder is one of the important components, which is usually made by adding a small amount of lubricant to pure aluminum foil.
II. Manufacturing Process of Aluminum Powder
1. Melting of raw materials: Place aluminum blocks in a vacuum melting furnace and heat them with an intermediate - frequency induction heater to fully melt them and form molten aluminum.
2. Ball - milling treatment: Send the molten aluminum into the atomization chamber through a liquid guide tube and conduct atomization treatment under the protection of a nitrogen - helium mixed gas to form atomized aluminum droplets. Then, use a cooling system to quickly solidify these aluminum droplets to form tiny spherical aluminum powder.
3. Drying treatment: Put the obtained aluminum powder slurry into a drying tray and use a dryer for drying treatment to remove moisture.
4. Sieving: Sieve the dried metal powder into aluminum powder suitable for fireworks.
III. Mixing and Assembly
When making fireworks, the proportion of aluminum powder and other components is very important. Generally, the ratio of potassium nitrate, charcoal powder, sulfur, and aluminum powder is 60:30:10:5. The specific steps are as follows.
1. Mixing: Uniformly mix potassium nitrate, charcoal powder, sulfur, and aluminum powder.
2. Molding: Put the mixed materials into a firework mold for molding.
3. Ignition: Ignite the fireworks with black matches and observe the effects.
IV. Safety Precautions
Strict safety regulations must be adhered to during the production and use of aluminum powder fireworks. Aluminum powder should be sealed and isolated from air during storage to prevent oxidation and should avoid direct exposure to sunlight, rain, or excessive temperatures. During transportation, excessive shaking and vibration should be avoided to prevent the separation of some aluminum powder components.
