This diploma thesis presents the most important technological as well as economic aspects of a new recycling concept for Waelz slag that is being developed at the University of Leoben. Nowadays, a vast majority of the slag accumulating from recycling steel mill dust in the Waelz process is sent to landfill which generates costs. However, a new method using a top blown rotary converter as reaction vessel provides an interesting solution to the problem. Throughout the project different quality aspects play an important role as well. In the first part of this work the required physico-chemical calculations are performed which consequently represent the input parameters for the actual experiments on laboratory scale. The other half deals with different economic aspects regarding the realization of this process. Therefore, financial values such as the capital expenditure, the operational expenditure and the earnings from the products are calculated and interpreted. This action is performed for a realistic case where the input factors show close reference to comparable industrial processes, whereas a best and a worst case scenario highlight different opportunities of the project. Accordingly, providing profitability information for a possible realization and hence for an investment decision represents this thesis’ main aim.