Safely Extracting Emissions in Hardening Processes

Salt bath hardening processes can use either dry or wet extraction systems, depending on the type of salt and specific application. In most cases, dry systems are preferred due to their higher energy efficiency. However, when aqueous quenching solutions are used, a wet system is recommended to handle the resulting moisture.

In induction hardening, parts are rapidly heated and simultaneously quenched with a water-miscible high-temperature oil. Keller coolant mist separators are ideal for this application. They feature an automatic cleaning system designed specifically for highly viscous aerosols, allowing for continuous, uninterrupted operation.

Gas hardening processes typically require wet separators with a pre-spray system to reduce fire risk from open flames. After collection, the exhaust air is quenched with water to protect the ductwork and prevent ignition hazards.