The impurity removal ability of agent cast granular refining flux is determined by the adsorption and dissolution of oxide inclusions in melt and the chemical interaction between refining agent and melt. The smaller the interfacial tension between the oxide inclusions in the refiner, the better the adsorption and the stronger the removal for the impurities of the oxide inclusions.
Removal of impurities by agent cast granular refining flux:
In the melt of aluminium and aluminium alloys, refining agents can remove metal impurities, oxides and other oxide inclusions from the melt through physical, chemical or physical-chemical interactions. The impurity removal ability ofagent cast granular refining fluxis determined by the adsorption and dissolution of oxide inclusions in the melt and the chemical interaction between the refining agent and impurities in the melt. The smaller the interfacial tension between the refiner and the inclusion is, the better the adsorption of the refiner is and the stronger the removing effect is. Some metal impurities in aluminium melt are very difficult to remove in the process of smelting. These impurities can only be strictly restricted in raw materials, such as silicon, iron and other impurities. The other metal impurities, such as calcium, zinc and other metals, will have adverse effects on the properties of aluminium alloys. These harmful impurities should be removed before smelting or casting. The traditional method is to add refining flux in the furnace, so it is called the “refining”.