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The purpose of this research is to perform a microstructural characterization of the stabilized spent vanadium pentoxide (V 2 O 5 ) catalyst in the copper smelter slag. The spent V 2 O 5 catalyst (SVC) is a discarded material from a sulfuric acid production plant. The used SVC is a catalyst material supported in SiO 2 . The used copper smelting slag (CSS) was from a copper refining mine. The toxic V 2 O 5 compound present in the SVC was stabilized via pyrometallurgical processing with the CSS in an electric furnace with a CSS/SVC 4:1 ratio at 1250°C to obtain a fused compound. The microstructural and chemical characterization of the CSS, SVC used materials and the obtained fused compound, were performed by scanning electron microscopy (SEM) coupled and Energy dispersed X-ray analyser (EDS), X-ray powder diffraction (XRD) and Differential Thermal Analyser (DTA-TGA). The fused compound was a complex slag that comprised of Fe 2 SiO 4 and FeVO 4 phases.

In this paper, a new method for group decision making from imprecise opinions is presented. This method, which is called "moviQuest Decision Making" (MQDM), is the basis of the group decision making in the moviQuest-MAS social network platform.

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Aluminum matrix composite materials (AMCs) are widely used in components for the aerospace and automotive industries [1]. These compounds show a high strength/weight ratio, good mechanical properties and greater durability due to the addition of particles as reinforcements [1,2]. The present work will focus on the study of the reinforcement of AA 6061 alloy with particles of CaSiO3 (wollastonite). Powder metallurgy is widely used to control the dispersion of particles in AMCs [3,4]. The present work aims to study the influence of different contents of CaSiO3 on the microstructure of the alloy matrix and the effect of the powder metallurgy technique by optical microscopy (OM), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM / EDS).