The growth of the automotive industry and increased efforts to reduce the environmental impact of transportation require the use of more and more aluminium components in the production of new cars. The process of high-pressure die casting of aluminium makes it possible to meet the goals, but it requires the use of coolants based on oil and wax emulsions that are difficult to dispose of. A method for demulsification of real wastewater samples from the high pressure die casting process was developed and evaluated. The optimal parameters for conducting the separation process were determined, and the changes occurring in the emulsion being separated were analysed.
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