What is the difference between aluminum powder and alumina powder? How to turn alumina powder into aluminum powder?

1. What is the difference between aluminum powder and alumina powder?

Aluminum powder can burn, the combustion product is aluminum oxide, and aluminum oxide cannot burn.

1. Aluminum powder

Metal aluminum powder is simple aluminum. Aluminum is very active. Its anti-corrosion also relies on an aluminum oxide film, but it is undeniable There must be a small amount of aluminum on the surface that is oxidized into alumina.

Aluminum powder, commonly known as “silver powder”, is a silver metallic pigment. It is made from pure aluminum foil with a small amount of lubricant added, pounded and crushed into scaly powder, and then polished. Aluminum powder is light, has high buoyancy, strong hiding power, and has good light and heat reflection properties. After processing, it can also become non-leafing aluminum powder. Aluminum powder can be used to identify fingerprints and can also be used to make fireworks. Aluminum powder is a major category of metallic pigments due to its wide use, large demand and variety.

2. Alumina powder

Aluminum oxide is metallic aluminum in the air The reason why it is not easily corroded is that pure metallic aluminum reacts easily with oxygen in the air to form a thin aluminum oxide film covering the aluminum surface exposed to the air. This aluminum oxide film can prevent the aluminum from continuing to oxidize. The thickness and properties of this oxide film can be enhanced through a process called anodizing (anodic corrosion protection). Alumina powder is used as high-temperature refractory material to make refractory bricks, crucibles, porcelain, artificial gemstones, etc. Alumina is also a raw material for aluminum smelting. Calcining aluminum hydroxide can produce γ-Al₂O₃. γ-Al₂O₃ has strong Adsorption capacity and catalytic activity, can be used as adsorbent and catalyst.

2. How to turn alumina powder into aluminum powder

Decompose it by electrolyzing alumina, and after decomposition, we get Aluminum, the chemical formula is 2Al₂O₃==Electricity==4Al+3O₂.

Actually, this reaction requires too high a temperature, so cryolite is added. The melting point of cryolite is relatively low, and aluminum oxide can be dissolved in the melted cryolite and ionized to obtain aluminum ions and oxygen ions! Without cryolite, oxygen must be meltedAluminum can be ionized to obtain aluminum ions and oxygen ions, but high temperature is required.

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