Environmental impact of a granite processing factory as source of naturally occurring radionuclides

Guillén, J.; Tejado, J. J.; Baeza, A.; Salas, A.; Muñoz-Muñoz, J. G.

doi:10.1016/j.apgeochem.2014.06.001

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…Assim, o gerenciamento adequado dos resíduos de rochas ornamentais agrega valor econômico e ambiental ao produto final. Em adição a isso, é uma excelente oportunidade de mercado, visto que promove a diversificação da produção, gerando matérias-primas alternativas para vários setores industriais, além de adequar as empresas à legislação ambiental brasileira (JIMÉNEZ et al, 2013;GUILLÉN et al, 2014;GAMEIRO;SILVA, 2014;SUKHOLTHAMAN;SHIRAHADA, 2015;SCHACKOW et al, 2015). Nessa perspectiva, a produção de matérias-primas alternativas tem ganhado notoriedade em função do seu consumo cada vez maior.…”

Section: Introductionunclassified

Imobilização de metais pesados presentes nos resíduos de quartzito por meio da incorporação em argamassas com substituição total do agregado natural

Barros

Dantas

Neves

et al. 2020

Eng. Sanit. Ambient.

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RESUMO Este trabalho objetivou imobilizar metais pesados presentes nos resíduos de quartzito por meio da incorporação em argamassas em substituição total ao agregado natural. Dois tipos de resíduos foram utilizados: os resíduos de fragmentação das aparas (QS) e os do pó de serragem (QP). Os resíduos foram caracterizados por fluorescência de raios X, difração de raios X e ensaios de toxidade conforme metodologia da Norma Brasileira (NBR) 10005, da NBR 10006 e do Toxicity Characteristic Leaching Procedure (TCLP) 1311. Então, foram analisadas composições de argamassas contendo cimento, cal e os resíduos (QS, QP) utilizando-se a técnica de delineamento de mistura, determinando os melhores traços, o melhor tipo de cura (imersa ou úmida) e, posteriormente, avaliando a resistência dos corpos de prova após cura. A caracterização do resíduo de quartzito revelou a presença de vários metais pesados e extratos lixiviados em contato com a água, classificando-o como resíduo de Classe I — Perigoso. Os resultados indicam que as composições determinadas foram capazes de imobilizar os metais pesados presentes nos resíduos de quartzitos, bem como resultou em argamassas com resistências mecânicas superiores a 2 MPa. Por fim, mostrou-se que essa técnica de solubilização e estabilização dos contaminantes presentes nos resíduos de quartzito é uma alternativa tecnologicamente viável e ambientalmente adequada para a destinação final desses resíduos.

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Section: Introductionunclassified

Imobilização de metais pesados presentes nos resíduos de quartzito por meio da incorporação em argamassas com substituição total do agregado natural

Barros

Dantas

Neves

et al. 2020

Eng. Sanit. Ambient.

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“…These works showed that, in the pH range 4-9, U(VI) sorption increases up to 90 % within 72h. Investigation of the environmental impact of uranium released by the industrial processing of granitic materials (scraps, water and slurries) also shows modification of U speciation with increasing pH (Guillén et al 2014). In addition, granite alteration studies by column acid leaching have demonstrated that weathering affects U distribution (Guthrie and Kleeman 1986).…”

Section: Introductionmentioning

confidence: 99%

Impact of incipient weathering on uranium migration in granitic waste rock piles from former U mines (Limousin, France)

Kanzari

Gérard

Boekhout

et al. 2017

Journal of Geochemical Exploration

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International audienceThis study investigates the impact of incipient weathering on uranium (U) migration at the surface of granitic waste rock piles from former U mines in Limousin (France) operated half a century ago. We used a multi-scale mineralogical and geochemical approach to evaluate the impact of incipient weathering on uranium mobility in a chaotic waste rock pile. The surficial part of five former mines located in the “La Crouzille” and “La Creuse” mining districts was investigated. Four groups of samples were defined based on field observations and mineralogy, granites, lamprophyres, hydrothermally altered rocks and weathering products. Petrology, mineralogy and geochemistry investigations show the importance of mineralogical and geochemical transformations during incipient weathering over a few decades. The Chemical Index of Alteration (CIA) is successfully used to assess the weathering state of samples in the waste rock pile chaotic deposit. The mean CIA value is around 60 for unweathered/incipiently weathered granites whereas highly weathered samples have CIA around 70. This means that no significant major element loss occurs in the granitic rocks suffering incipient weathering. Various micron-size secondary U minerals consist in a large diversity of oxidized uranyl minerals (uranophane, uranyl sulfate, curite, autunite and other uranyl phosphates), with dominant uranyl phosphates, indicating local U mobility in the waste rock pile. Autunites micromorphology indicates different degrees of weathering of the samples in which it crystallizes. U is primarily concentrated in the clay fraction (< 2 μm), associated with secondary minerals from granite alteration (clay minerals such as smectite and vermiculite, Fe-oxides and phosphate minerals) and, to a limited extent, relict primary minerals. These weathering products contribute to U(VI) stabilization under oxidizing conditions

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“…However, stone material is a nonrenewable resource. Under the tendency that the society appeals to save industrial resources and protect environment, how to exploit and utilize stone materials efficiently has become a bottleneck in stone material industry [4][5][6]. Ogilvie SR [7] analyzed the microstructure of granite under the condition of uniaxial compression using image analysis method and found stronger aeolotropy of internal structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis on physical and mechanical properties of thermal shock damage of granite

Xiao¹,

Li²,

Chen³

et al. 2016

Frattura Ed Integrità Strutturale

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The purpose of this study was to explore the changes of mechanical and physical properties of granite under different thermal loading effects. Uniaxial compression experiments studying the rules of the influence of temperature load on mechanical properties of granite were carried out. After high-temperature heating at above 600 °C, granite tended to have stronger ductility and plasticity as well as declined peak stress and compressive strength. Thermogravimetry -differential scanning calorimetry (TG-DSC) analysis results showed that, thermal load at different temperatures induced reactions such as water loss, oxidation and crystallization in the microstructure of granite, which led to physical changes of granite. Hence it is concluded that, heating can significantly weaken the mechanical performance of granite, which provides an important support for the optimization of heating assisted processing of granite. It also reveals that, heating assisted cutting technique can effectively lower energy consumption and improve processing efficiency.

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Environmental impact of a granite processing factory as source of naturally occurring radionuclides

Cited by 8 publications

References 14 publications

Imobilização de metais pesados presentes nos resíduos de quartzito por meio da incorporação em argamassas com substituição total do agregado natural

Imobilização de metais pesados presentes nos resíduos de quartzito por meio da incorporação em argamassas com substituição total do agregado natural

Impact of incipient weathering on uranium migration in granitic waste rock piles from former U mines (Limousin, France)

Experimental analysis on physical and mechanical properties of thermal shock damage of granite

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