Pragokor ALSIL 412 is a refining salt suitable for an intensive cleaning of melted aluminium, especially in the gas-heated furnaces, which creates a dry and powder-like slag at the chemical reaction with aluminium oxide. Due to the chemical reaction, the slag itself is a bit self-heating and retains only a minimum amount of metal which may readily evaporate and, therefore, loss in the metal refined is reduced substantially.
The agent should be used for the refinement of aluminium and its under-eutectic alloys with silicone and copper being processed in the gas-heated furnaces where otherwise a local overheating of both the smelt as well as slag might occur. Unlike Pragokor Alsil 412, current refining salts may be locally overheated inside the furnace and, consequently, may retain much metal to be refined.
Way of use:
At the temperature 680oC, the agent should be sprinkled onto the surface of the smelt in the concentration 0,1 – 0,3%, calculated on the total amount of the processed metal and, after a delay, immersed and stirred into the melt with a bell or scraper. The slag created will float up onto the surface and will separate readily.