Now the export volume of brown fused alumina is increasing every year, and the processing methods of brown fused alumina have also put forward high requirements. Here are some more commonly used processing methods.
1. Calcination treatment
Brown aluminum oxide is calcined to produce some liquid substances that can be filled into the small cracks generated during the crystal lattice breaking process, and calcined can also burn off the dust and grease on the brown fused alumina. The operation process is to process brown fused alumina by calcining in a rotary furnace or a vertical furnace, which can enhance its toughness and hardness after treatment. the
2. Alkali corrosion treatment
Put brown aluminum oxide in sodium hydroxide solution, then take it out for heating, cooling, washing and drying.
In this method, the reaction between sodium hydroxide and alumina can improve the binding force and polarity of brown fused alumina.
3. Coated with ceramic liquid silane composite treatment
It is made by adding prepared ceramic slurry to aluminum oxide, drying and firing.
It adds a layer of porous ceramics to the surface of brown fused alumina, making it resistant to heat, acid and alkali.
4. Brown aluminum oxide coated with silane treatment
Silane generally chooses medium molecular weight flowing liquid, and large molecular weight silicone oil and silicone grease are not suitable as tackifiers.
The advantage is that silane can form a transition layer between the aluminum oxide and the resin binder to increase the bonding force between the two.
5. Brown aluminum oxide coating resin solution treatment
Apply a layer of prepared resin solution on the surface of the corundum and then cure it. Adding a layer of resin on the surface can improve the bonding effect of the corundum and the binder and the heat resistance, acid and alkali resistance of the abrasive, so that the service life of the corundum can be improved. long.
6. Brown corundum coated with metal salt treatment
We first prepare the metal salt into a solution, then apply it on the surface of brown corundum, and then calcine it at high temperature. There are many types of metal salts that can be selected in this method, such as iron nitrate, copper sulfate, and nickel oxide.
