Abstract
High-temperature coal tar pitch (CTPht) is an excellent binder in materials for use in the metallurgical industry. Due to the content of polycyclic aromatic hydrocarbons (PAH), CTPht (EC/List no. 266-028-2) has been defined as a ’substance of very high concern’ under the European Chemicals Legislation (European Chemicals Agency. 2017). Authorization has been required in Europe for use of CTPht, since October 4th, 2020, but exception has been granted for use in self-baking electrodes, as Soderberg. Several new products have been developed to substitute products containing CTPht in addition to already existing CTPht free materials. These materials contain binders which with a health friendly view, range from modified CTPht to bio binders with no harmful components. For some of these the change of properties during curing has been measured, together with high temperature properties. Different materials are compared to show strength and weaknesses both for curing and baked properties. Conditions during use of materials for tap hole and runners, have been measured on several furnaces and for plugging guns. The measured conditions are combined with the measured properties of different CTPht materials to find working solutions for ferroalloy furnaces.
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