6 research outputs found
Kalorimetrijsko ispitivanje tekućih Ga-Me (Sn, Zn) legura Oelsenovom metodom
The results of calorimetric investigation of binary, liquid Ga-Me (Sn, Zn) alloys are presented in this paper. According to constructed space enthalpy diagram and enthalpy isotherm diagram, activities, activity coefficients and other partial and integral molar quantities were determined at different temperatures. Also, comparison was made with existing literature data
EXAMPLES OF LCA METHODOLOGY IMPLEMENTATION IN STEEL INDUSTRY
Steel industry kept pace with actual trends for environmental protection in many ways – through different technological improvements considering environment protection, important share of recycling in the steel production, design of so called “eco-steels”, materials designed according to recent environmental directives and legislatives, etc. In the frame of steel production monitoring, LCA methodology is very important for obtaining an accurate environmental picture of a process, due to the fact that the process should be evaluated over its entire life cycle. A number of tools and methodologies have been developed in recent years to assess the potential environmental impacts associated with a product, process or activity during its entire life cycle. The examples of Life Cycle Assessment (LCA) are used by large steel industrial companies as potentially helpful tool for improving the production processes, efficiency of resource utilization and significantly reduction of waste generation and emissions are presented in this paper
Thermal analysis and kinetics of the chalcopyrite-pyrite concentrate oxidation process
The paper presents the results of experimental investigation of the chalcopyrite-pyrite concentrate oxidation in the air. Characterisation of the initial sample and oxidation products was done by ICP-AES, XRD, EDXRF methods. Phase stability diagrams were constructed for Cu-Fe-S-O system at 25, 450, 650 and 900 °C. Equilibrium composition of the charge for the optimal oxidation process was calculated. DTA-TG analysis was used for monitoring the oxidation process. Kinetic parameters in non-isothermal conditions were determined, based on Kissinger and Ozawa methods.Values of activation energies showed that all stages of the oxidation process occur in the kinetic field
EXAMPLES OF LCA METHODOLOGY IMPLEMENTATION IN STEEL INDUSTRY
Steel industry kept pace with actual trends for environmental protection in many ways – through different technological improvements considering environment protection, important share of recycling in the steel production, design of so called “eco-steels”, materials designed according to recent environmental directives and legislatives, etc. In the frame of steel production monitoring, LCA methodology is very important for obtaining an accurate environmental picture of a process, due to the fact that the process should be evaluated over its entire life cycle. A number of tools and methodologies have been developed in recent years to assess the potential environmental impacts associated with a product, process or activity during its entire life cycle. The examples of Life Cycle Assessment (LCA) are used by large steel industrial companies as potentially helpful tool for improving the production processes, efficiency of resource utilization and significantly reduction of waste generation and emissions are presented in this pape
Phase transformation and microstructure study of the as-cast Cu-rich Cu-Al-Mn ternary alloys
Four Cu-rich alloys from the ternary Cu-Al-Mn system were prepared in the
electric-arc furnace and casted in cylindrical moulds with dimensions: f=8 mm
and length 12 mm. Microstructural investigations of the prepared samples were
performed by using optical microscopy (OM) and scanning electron microscopy,
equipped by energy dispersive spectroscopy (SEM-EDS). Assignation of
crystalline phases was confirmed by XRD analysis. Phase transition
temperatures were determined using simultaneous thermal analyzer STA DSC/TG.
Phase equilibria calculation of the ternary Cu-Al-Mn system was performed
using optimized thermodynamic parameters from literature. Microstructure and
phase transitions of the prepared as-cast alloys were investigated and
experimental results were compared with the results of thermodynamic
calculations