Results and trends on the injection of plastics and ASR into the blast furnace

As an alternative to the injection of oil or pulverized coal, the injection of waste plastics is common operational practice in a number of blast furnaces. Over and above that the trend of using other waste materials as auxiliary reducing agents should also be noted. The injection of ASR has also been tested, but has not yet been introduced into normal operational conditions. From the metallurgical point of view it could be advantageous to inject synthesis gas made from ASR instead of the injection of granulated ASR itself. Such a synthesis gas could be injected into the tuyeres at the raceway level, as well as into additional tuyeres at the lower part of the shaft. Simulation model calculations promise considerable savings in coke consumption with higher productivity with shaft gas injection.