DSpace Coleção:http://repositorio.ufc.br/handle/riufc/586612026-04-04T19:44:14Z2026-04-04T19:44:14ZAnálise de custos da aplicação do sistema de iniciação não elétrico em uma pedreira dos Sertões de Crateús-CESouza, Antonio Ítalo Rodrigues dehttp://repositorio.ufc.br/handle/riufc/847892026-02-13T15:57:29Z2026-01-01T00:00:00ZTítulo: Análise de custos da aplicação do sistema de iniciação não elétrico em uma pedreira dos Sertões de Crateús-CE
Autor(es): Souza, Antonio Ítalo Rodrigues de
Abstract: The rock breaking stage is fundamental in the mining process, as it directly influences operational efficiency, production costs, and the quality of fragmentation required in subsequent stages of mining. In this context, this study analyzes the technical and economic feasibility of applying the non-electric initiation system (NONEL) in a blasting plan developed for a gneiss quarry, considering that the costs of explosives and accessories represent a significant portion of blasting operations. The methodology adopted was based on a literature review, collection of geological and operational data from the quarry studied, and the development of new firing plans using the NONEL system, considering parameters such as distance, spacing, bench height, explosive charge distribution, and firing sequence. The results obtained and bibliographic studies indicate that the use of NONEL provides greater reliability in shock wave transmission, with a possible reduction in detonation failures, in addition to contributing to a decrease in the consumption of explosives and accessories. The main advantages of the system include greater operational safety, resistance to electrical interference, and the potential for reduced consumption of explosives. A disadvantage is the possibility of occasional failures associated with loss of contact in the charge column. Overall, the cost analysis showed a reduction in overall blasting costs from R$257,300.64 to R$105,285.08, or R$123,232.79, when two Nonel accessories were used per hole, showing that the NONEL system is a technically efficient and economically advantageous alternative, contributing to cost optimization and the reduction of operational risks in open-pit mining activities.
Tipo: TCC2026-01-01T00:00:00ZUso do método de enumeração completa para otimização da mistura de calcário para indústria cimenteiraSilva, Joice Maria de Paivahttp://repositorio.ufc.br/handle/riufc/847632026-02-12T17:07:11Z2026-01-01T00:00:00ZTítulo: Uso do método de enumeração completa para otimização da mistura de calcário para indústria cimenteira
Autor(es): Silva, Joice Maria de Paiva
Abstract: The mining sector has been undergoing significant transformations in the global economic landscape, marked by an increasingly competitive and technological environment. Companies in the sector have been directing efforts towards improving their production processes, aiming to increase operational efficiency and productivity while simultaneously seeking to reduce costs. In this context, there is a growing interest in the use of operational research tools to support decision-making. This area stands out for allowing the modeling and analysis of different qualitative and quantitative variables in diverse situations, providing a more precise evaluation in the planning of solutions. For mining companies, which frequently make decisions based on previous practical experiences, operational research represents an opportunity for a technical and structured approach. A practical example of its application is in the formation of ore piles generated by materials with different qualities in different mining fronts, a common challenge faced by these companies. In this sense, the present study aims to address the need to optimize the process, aiming to maximize the production of material that meets the grades required by quality control and to assist in the short-term planning of a limestone mine. To achieve this objective, an on-site survey was conducted to obtain the main parameters of the mining company's production process: equipment capacity, daily production of each tunnel, and the limits of quality control parameters (Lime Saturation Factor - CSF, Silica Modulus - MS, and Alumina Modulus - MA) for the different types of limestone. The Complete Enumeration method was applied to the modeling in conjunction with Excel software, an approach that enabled the generation of solutions that meet operational and quality constraints, in order to obtain viable solutions for the problem observed in cement production. The results demonstrated that the model was able to generate viable solutions for scenarios I, II, and III, meeting the established quality limits and the production required by the plant, proving its effectiveness in defining the ideal mixing proportions between the stockpiles.
Tipo: TCC2026-01-01T00:00:00ZAvaliação da alterabilidade química de quartzitos ornamentais do Estado do CearáDjassi, Djibrilhttp://repositorio.ufc.br/handle/riufc/847232026-02-11T16:13:40Z2026-01-01T00:00:00ZTítulo: Avaliação da alterabilidade química de quartzitos ornamentais do Estado do Ceará
Autor(es): Djassi, Djibril
Abstract: This study aimed to carry out the petrographic characterization and the evaluation of the chemical alterability of two ornamental quartzites widely used in the state of Ceará: Perla Santana and Bianco Supreme. The research is framed within the context of the growing economic importance of the ornamental stone sector in Brazil, especially quartzites, which have been gaining prominence in the international market due to their high added and aesthetic value. Considering that the durability and aesthetic performance of these rocks are directly related to their resistance to chemical agents, this study seeks to understand how mineralogical, textural, and petrographic characteristics influence surface degradation processes. The methodology consisted of selecting representative samples, on which macroscopic petrographic analyses were performed, as well as tests of resistance to chemical attack and staining using different chemical reagents and everyday products. Thin sections were prepared, and color and gloss measurements were carried out at the UFC Geology Laboratory in Fortaleza, while petrographic and chemical analyses were conducted at the UFC Crateús’s campus laboratory. Color variations were quantified by colorimetry using the CIE L*a*b* system, and surface gloss was measured before and after chemical attacks, allowing an objective assessment of surface degradation. The results indicated that Bianco Supreme quartzite presents a more homogeneous texture, more compact structure, and lower density of fractures and accessory minerals, whereas Perla Santana shows a higher degree of fracturing and the presence of minerals filling fissures, which increases its susceptibility to fluid percolation and chemical action. Tests demonstrated that, in general, brushed surfaces are more susceptible to staining and gloss loss than polished surfaces. It is concluded that Perla Santana quartzite is more chemically vulnerable than Bianco Supreme, mainly for microstructural rather than purely compositional reasons, highlighting the importance of integrating petrographic characterization and technological tests for the proper specification and use of these materials in architectural projects.
Tipo: TCC2026-01-01T00:00:00ZAnálise da evolução da legislação acerca da disposição de rejeito em barragens a montante no BrasilMarques, Alexander Fernandeshttp://repositorio.ufc.br/handle/riufc/846322026-02-05T12:43:10Z2026-01-01T00:00:00ZTítulo: Análise da evolução da legislação acerca da disposição de rejeito em barragens a montante no Brasil
Autor(es): Marques, Alexander Fernandes
Abstract: The upstream tailings dam deposition technique is the most economical and oldest method in dam construction. Despite safe designs and continuous monitoring, the upstream raising technique has been associated with dam failures, evidencing gaps in knowledge regarding its complex engineering and behavior. From this perspective, the central objective of this research is to analyze how laws in the national scenario conceive the deposition of tailings in upstream dams, as well as their risks and technical aspects. It also aims to discuss the impacts that tailing dam depositions can have. To obtain results, a qualitative research approach with a descriptive objective will be applied as methodology, adopting a systematic literature review as the procedure. Furthermore, this research is considered of paramount relevance, given that the mining sector, in addition to generating economic effects, also reverberates in social and environmental fields, making laws indispensable for the regulation and proper handling of tailings in dams. It is expected that this work will highlight the issues involved in tailings deposition, elucidating the need for further studies to ensure the safety of dams or structures designed to contain this material.
Tipo: TCC2026-01-01T00:00:00Z