Primary stores in the sense of geogenic mineral deposits (ores and stones) are diminishing, while the coresponding stocks in urban settlement are increasing accordingly. In this situation, concepts are required to use both the remaining primary resources and the secondary resources more efficiently. Petrologic evaluation is an approach in this context. Petrologic evaluation includes the combination of know-how and tools from geosciences and materials sciences. Additionally, engineering knowledge as well as material flow analysis methods are necessary. The issue to evaluate is the genesis of the flow of materials. The mode of operation of specific compounds on the genesis path is to be pursued. Based on a petrologic approach, it is possible to differentiate between essential (or favorable) and indifferent and disrupting compounds or reactions (disrupting with respect to technical means and environ-mental impact). Such an approach permits a product design in the sense of a material arrangement that is adapted to the function. The approach is illustrated with the example of a new generation of thermal waste treatment (smelting processes), which combines treatment of municipal solid wastes with production processes and mining in order to contribute to better resource management.
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