Abstract

Abstract

Abstract

The purpose of this work is to study the relation and the effect of nitrogen in the reducing gas mixture used in the isothermal reducibility testing of the iron oxide by planning and carried out using ammonia gas so that its decomposition produces 15% H2 and N2 gases. Ammonia gas also 6% by volume was added to a gas flow containing 28% H2 y 68% N2 by weight so that obtain a final gas composition of 30% H2 and &0% N2. This reinterpretation of the test data allowing the comparison of reducibility test reducibility in such a way to compare the nitrogen effect on swelling of iron oxides undergoing reduction. The comparison was made based on the theoretical estimation of nitrogen absorption, the fresh metallic iron formation during the hematite-magnetite-Wustite so produced and the abnormal volume increase of the considered samples. It was also possible to empirically relate and compare the studied effects of nitrogen content from different sources but gas such as solid carbon containing reducers such as coal.

Abstract

The recycling of composites by pyrolysis is a technology still under development, and although it is beginning to be implemented, it still poses different problems to be solved to ensure its viability and profitability. Thus, key aspects such as the high energy consumption of the process, the search for commercial outlets for secondary products, as well as maximising the value of the main products, understood as the reinforcement fibres of the composite itself, must be tackled. Regarding the reduction of energy consumption, AIMPLAS is working on the use of microwave radiation as a more efficient source of energy than convection heating, studying the possibility of reducing the temperature of the process, analysing the effect of this radiation on the quality of the fibres obtained and the final mass balance of the different fractions. Additionally, AIMPLAS has worked on the study of the application of sizings, mainly in carbon fibres. AIMPLAS is working on the development of new products and the optimisation of the application method to obtain short fibres coated with sizings, showing the improvement in the mechanical properties of the final composite due to a better interaction with the resin.