The use of alternative raw materials is essential for establishing a circular economy in the mineral and ironmaking sectors. Therefore, this study investigates the potential of lime sludge as fluxing material during pelletization and proposes an alternative route for the usage of waste. The pellets were manufactured with different binary basicity values (CaO/SiO 2 ) (0.15-0.45) and bentonite (0.5-0.7 wt%) and fixed carbon (0.5-1.1 wt%) contents. The results demonstrated that lime sludge has significant potential for application in pelletization. Pellet quality was evaluated using drop number, mechanical strength, tumble index, porosity, and kinetic analyses. Pellets with the optimal composition using lime sludge withstood 3.6 drops/pellet, a tumble test of 1.57 wt.%, and a mechanical strength test of 214.83 kgf/pellet and exhibited a porosity of 31.28%. Lime sludge did not influence the reducibility of the iron-ore pellets. In the temperature range of 800-900 °C, the reaction was controlled by diffusion, with E a between 179.89 and 233.10 kJ/mol.
AHP (Analytic Hierarchy Process) tool stands out for its reliability and effectiveness, therefore, the objective of this research was to identify the scientific productions found in the electronic databases chosen by the author on the AHP tool. The date of publication covered by the survey comprises the periods from April 1992 to January 2018. The electronic bases used for the research were Scopus, Web of Science and Scielo, which after filtering only articles that mentioned the method in the title or abstract totaled in 178 articles. The year 2013 was the most productive with 24 articles (13.48%) published. Eight researchers appeared to be more productive because they had more than one published article. The International Journal of Production Research was the most productive periodical (5.62%), China the country with the largest number of publications (34.26%) and four universities had the largest number of articles published (6.74%) and the words that more appeared in article were process, hierarchy, analytic, fuzzy and production. It is concluded that the AHP tool still has great relevance in decision support methods even after 46 years of its creation, and that its potential continues to be promising for the analysis and solution of problems.
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