Safely Extracting Emissions in Hardening Processes

Either dry or wet systems can be used for salt bath hardening processes, depending on the salt used and the application. As a rule, the dust can be extracted using a dry operating system, which is more energy efficient. However, if aqueous dousing solutions are used, a wet system is recommended due to the moisture content.

During induction hardening, the products are quickly heated in a machine and simultaneously drenched with a water-miscible high temperature oil. Keller coolant mist separators are equipped with a specially designed cleaning system for automatic filter element cleaning, thereby enabling an uninterrupted production process. They are particularly suitable for exhaust air contaminated with highly viscous aerosols.

Gas hardening processes use wet separators with pre-spraying to minimize the fire risk posed by open flames inside the systems. By quenching with water after collection, the ductwork is protected from a potential fire.