Systems and solutions. Below is a partial list of projects realized so far by SCHWING. We are glad to provide more details upon request: Carburization, D: 12 m 40000 kg/h, 550 °C. Aluminum particles, rectangular 30 m, > 550 °C. silicic acid, multistage, rectangular per stage 10 m, > 500 °C. reduction of iron oxide to metal.