The sodium-free refining agent used for aluminum alloy smelting has a significant effect of removing hydrogen during the refining process, and can fully remove oxide inclusions in the melt, and the hot slag recovery is more convenient and the recovery rate is higher. The refining agent can refine the alloy to a certain extent. It does not contain sodium salt and has a good refining effect.
Aluminum and its alloys have the characteristics of being easy to oxidize and absorbing gas during the smelting and casting process, making it easy to form gases and inclusions in the molten aluminum, which will cause porosity, shrinkage, shrinkage, cracks, insufficient casting and A series of defects such as leakage greatly reduce the strength, plasticity, fatigue resistance, corrosion resistance and other properties of the material, and even cause the casting to be scrapped, which greatly restricts the application of aluminum alloy. Therefore, it is very important to improve the purity of aluminum alloy. The significance of the aluminum melt purification process is also a key technology to ensure the metallurgical quality of aluminum alloy materials.
When aluminum alloy sodium-free refining agent is used for refining aluminum alloy, it can be used with nitrogen or argon to blow into the furnace to obtain a better hydrogen removal effect.
The preparation method of aluminum alloy refining agent includes the following steps:
Crush each raw material separately and pass through a 60-80 mesh screen;
Put the prepared raw materials into the mixer according to the proportion by weight and mix them thoroughly to obtain a uniform mixture;
Put the obtained homogeneous mixture into an oven or a tumble drying barrel, and bake for 2-3 hours at 100~105°C;
The homogenous mixture after baking is sieved with an 80-mesh screen, cooled to 40 degrees, packed and sealed to obtain the finished aluminum alloy sodium-free refining agent.
Advantages of Aluminum Alloy Sodium-free Refining Agent
1) The hydrogen removal effect is significant, and the H content can be reduced to a level of about 0.10~0.16ml/100gAl;
2) It can fully remove the oxide inclusions in the melt, and the slag removal rate can reach more than 90%; and the hot slag recovery is more convenient and the recovery rate is higher;
3) It can effectively reduce the burning loss of metal;
4) The preparation process is simple, the source of raw materials is wide, and it is convenient for large-scale production.