The refined flux is white (gray) fine powder, and its main components are compounds such as chloride and magnesia. After heat treatment and screening treatment, the product has a uniform particle size and is widely used for refining cast aluminum alloy in reverberatory furnaces and holding furnaces.
Adding aluminum refining agent to aluminum smelters can improve the quality of castings. They are mixed for specific processes and applications. Flux helps to protect the surface, deal with scum, clean furnace walls, clean metal, hydrogenate and refine crystals.
The product powder carried by the carrier gas (N, Ar) uniformly enters the molten aluminum through the powder injection device, and forms tiny bubbles after physical and chemical reactions, which are in complete contact with the molten aluminum and remove harmful gases such as hands. In addition, some materials in the product, Can firmly attach or absorb oxides and other impurities, so that it can be purified.
Advantages of Refined Flux
- Good fluidity, good slag removal and degassing performance.
- The purification effect is good, the pollution is small, the dosage is small, and the cost is low.
- Aluminum and slag are easily separated.
Aluminum refining agent is mainly used to remove slag. When the slag and gas content in aluminum and aluminum alloy melts is too high, it will greatly increase the possibility of metallurgical defects, such as pores and inclusions in the slab. In turn, it will reduce the strength and plasticity of the material and affect the surface quality of the product.
When the sodium content in the aluminum alloy is too high, it is easy to form a liquid adsorption layer on the surface or grain boundaries of the dendrites during hot working, resulting in brittle cracking of the high-magnesium aluminum alloy. Therefore, in the melting process of aluminum and aluminum alloys, slag, gas and alkali metals in the melt should be removed as much as possible.
For aluminum alloy melts with strict gas content and alkali metal content control, in addition to using nitrogen or argon as the refining gas, it is usually necessary to use more reactive chlorine and hexachloroethane for melt processing.
Although chlorine and hexachloroethane have good refining effects, they are harmful to the health of workers, equipment and the environment, and may be life-threatening in severe cases.