The SL-type cage-type graphite heat exchanger is composed of graphite tube plates, molded graphite tubes, and other graphite materials. It is mainly used for heating or cooling materials inside reaction kettles (during the production of methamidophos) or inside Benin tanks. This model features a simple structure, light weight, easy installation, high thermal efficiency, does not interfere with stirring, strong corrosion resistance, and can also be used for heat exchange between two corrosive media.