Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-02-22T23:50:58Z No. of bitstreams: 1 AndreAugustoNobregaDantas_DISSERT.pdf: 2471770 bytes, checksum: 3f4777f912d3ae957e3004f2f09714c8 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-02-26T21:24:22Z (GMT) No. of bitstreams: 1 AndreAugustoNobregaDantas_DISSERT.pdf: 2471770 bytes, checksum: 3f4777f912d3ae957e3004f2f09714c8 (MD5) / Made available in DSpace on 2016-02-26T21:24:22Z (GMT). No. of bitstreams: 1 AndreAugustoNobregaDantas_DISSERT.pdf: 2471770 bytes, checksum: 3f4777f912d3ae957e3004f2f09714c8 (MD5) Previous issue date: 2015-02-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / A minera??o no Brasil possui papel fundamental no desenvolvimento econ?mico e social, contribuindo diretamente na melhoria de vida da popula??o. Entretanto, a atividade mineradora ainda que seja feita de forma respons?vel e com um estudo adequado de gest?o de res?duos para diminuir o impacto dos seus efeitos, pode vir a causar danos nocivos ao meio ambiente. Outras formas de polui??o tamb?m s?o geradas devido ? atividade mineradora. A polui??o visual, provocada, pelo armazenamento dos res?duos a c?u aberto, al?m da polui??o sonora, provocada pelo barulho excessivo das m?quinas tanto na extra??o do min?rio, como no beneficiamento. Uma forma alternativa de diminuir os impactos ambientais provocados pela minera??o ? a utiliza??o dos res?duos nas camadas que ir?o compor os pavimentos das rodovias. Ent?o, este trabalho se prop?e a dar uma destina??o adequada aos res?duos oriundos do beneficiamento do min?rio de ferro, decorrentes da atividade mineradora do grupo de minera??o Mhag Servi?os e Minera??o S/A e Minera??o, na mina do Bonito, localizada no munic?pio de Jucurutu, no estado do Rio Grande do Norte. Os res?duos do min?rio de ferro foram estabilizados com um solo granular proveniente do munic?pio de Maca?ba, tamb?m no estado do Rio Grande do Norte, o qual est? sendo utilizado da duplica??o da BR- 304 referente ao trecho intitulado de Reta Tabajara. O presente trabalho foi desenvolvido em tr?s etapas, sendo a primeira dividida pelos ensaios qu?micos e mineral?gicos, pelos ensaios de caracteriza??o f?sica e pelos ensaios de pavimenta??o para os res?duos do min?rio de ferro. A segunda etapa corresponde aos mesmos ensaios, sendo realizado para o solo granular. A terceira etapa contempla os ensaios citados para tr?s diferentes misturas de res?duos de min?rio de ferro e solo granular, sendo elas: 15% de res?duos de min?rio de ferro e 85% de solo granular, 25% de res?duos de min?rio de ferro e 75% de solo granular, 50% de res?duos de min?rio de ferro e 50% de solo granular. Foi verificada a viabilidade t?cnica da utiliza??o dos res?duos oriundos do beneficiamento do min?rio de ferro, compactado na energia intermedi?ria e modificada, para utiliza??o em camadas de base, sub-base, refor?o de subleito e subleito. A incorpora??o dos res?duos oriundos do beneficiamento do min?rio de ferro em rodovias proporcionar? uma alternativa ao uso de agregados convencionalmente utilizados na pavimenta??o, al?m de preservar o meio ambiente. / Mining in Brazil has a key role in economic and social development, contributing directly to improve the lives of the population. However, the mining activity even if done responsibly and with a proper study of waste management to reduce the impact of its effects, may cause harmful damage to the environment. Other forms of pollution are also caused due to mining activity. The visual pollution caused by the waste storage at open sky, in addition to the noise pollution caused by the excessive noise of the machines both in the extraction of ore, as in processing. An alternative way to lessen the environmental impacts caused by mining is the use of waste in layers that will compose the pavements along the highways. Thus, this work sets out to give a proper disposal of the wastes from the processing of iron ore, resulting from the mining activity of the group of mining Mhag Services and Mining S/A, in the mine of Bonito, located in Jucurutu, a town in the state of Rio Grande do Norte. The residues of the iron ore were stabilized with a granular soil from the city of Macaiba, also in the state of Rio Grande do Norte, which is being used in the duplication of the BR-304 referring to the entitled passage of Reta Tabajara. The present work was developed in three stages, being the first one divided by the chemical and mineralogical tests, by the tests of physical characterization and by the tests of paving for the residues of the iron ore. The second stage corresponds to the same tests being performed for granular soil. The third stage includes the essays abovementioned for three different mixtures of iron ore waste and granular soil, being they: 15% of iron-ore waste and 85% of granular soil, 25% of iron-ore waste and 75% of granular soil, 50% of iron-ore waste and 50% of granular soil. The technical feasibility of using waste from the iron ore beneficiation was checked, compressed in the intermediate energy and modified for use in base layers, sub-base, reinforcement subgrade and subgrade. The incorporation of the residues originating from the improvement of the iron ore in highways will provide an alternative to the use of aggregate conventionally used in the paving, besides preserving the environment.

Made available in DSpace on 2014-12-17T14:07:03Z (GMT). No. of bitstreams: 1 LeonardoFM.pdf: 4456392 bytes, checksum: 36e6d8718ecd158955c24006e7afca9a (MD5) Previous issue date: 2009-10-30 / The mining industry is responsible for the generation of waste from their natural process of extraction. The mining impacts in urban areas are of special importance due to the high urban occupation, which are exacerbated due to the proximity of the mined areas and populated areas. Some solutions to wastedisposal have the potential to significantly reduce the environmental risks and liabilities, but represent higher costs in the stages of deployment and operation. The addition of mining waste as raw material in the development of commercial products reduces the environmental impacts, transforming the waste into a positive element in the generation of employment and income. This thesis studies the incorporation of waste iron ore in two clays, one from the ceramic industry of the City of Natal and the other from the ceramic industry of the Serid? Region, both in the State of Rio Grande do Norte, Brazil. Percentages of iron ore waste of 5%, 10% , 15%, 20%, 25% and 30% were used in the tested ceramic matrix. The two clays and the iron ore waste used as part of this investigation were characterized by X-ray diffraction tests, X-ray fluorescence tests, differential thermal analysis, thermogravimetric analysis and dilatometric analysis. The samples were sintered under temperatures of 850 ?C, 950 ?C and 1050?C at a heating rate of 5 ?C/min with isotherms of two hours. The following tests were performed with the samples: linear shrinkage, water absorption, apparent porosity, apparent density, mass loss in fire and bending resistance in order to obtain their physical and mechanical properties. An amount of 5% of waste iron ore in the matrix clay at a temperature of 850 0C resulted in na increase of about 65% in the tensile strength of the clay samples from the Natal ceramic industry. A linear shrinkage of only 0.12% was observed for the samples, which indicates that the physical properties of the final product were not influenced by the addition of the waste / A ind?stria extrativa mineral ? respons?vel pela gera??o de res?duos provenientes do seu processo natural de extra??o. Os impactos da minera??o em ?rea urbana revestem-se de especial import?ncia devido ao alto grau de ocupa??o urbana, que s?o agravados face ? proximidade entre as ?reas mineradas e as ?reas habitadas. Algumas solu??es de disposi??o de res?duos t?m potencial de reduzir significativamente os riscos e o passivo ambiental, por?m representam custos elevados nas etapas de implanta??o e de opera??o. A adi??o de res?duos de min?rio de ferro como mat?ria-prima na elabora??o de produtos que s?o utilizados comercialmente tem como objetivo diminuir os impactos ambientais, transformando esses res?duos em elementos positivos na gera??o de trabalho e renda. O presente trabalho estuda a incorpora??o de res?duo de min?rio de ferro em duas argilas, uma do p?lo cer?mico da Grande Natal e outra do p?lo cer?mico da Regi?o do Serid?, ambas do Estado do Rio Grande do Norte, em percentuais de 5%, 10%, 15%, 20%, 25% e 30%, com o intuito de verificar a potencialidade da incorpora??o do res?duo em matriz cer?mica. As mat?rias-primas foram caracterizadas atrav?s dos ensaios de difra??o de raios X, fluoresc?ncia de raios X, an?lise t?rmica diferencial, an?lise termogravim?trica e an?lise dilatom?trica. Os corpos-de-prova foram conformados e em seguida sinterizados nas temperaturas de 850 ?C, 950 ?C e 1050 ?C, ? taxa de aquecimento de 5 ?C/min, com iso terma de duas horas. Foram realizados os ensaios tecnol?gicos de retra??o linear de queima, absor??o de ?gua, porosidade aparente, massa espec?fica aparente, perda demassa ao fogo e tens?o de ruptura ? flex?o, com o intuito de se obter suas propriedades f?sicas e mec?nica. A argila do p?lo cer?mico da Grande Natal apresentou um aumento em torno de 65% na tens?o de ruptura ? flex?o, com um percentual ?nfimo de 0,12% na sua retra??o linear de queima, quando adicionados 5% de res?duo de min?rio de ferro na matriz de argila ? temperatura de 850 ?C, n?o comprometendo assim as p ropriedades f?sicas do produto final