Long-term prediction of non-processed waste radioactivity of a niobium mine in Brazil

Hajj, Thammiris Mohamad El; Gandolla, Mauro; Silva, Paulo Sérgio Cardoso da; Torquato, Henrique; Junior, Homero Delboni

doi:10.1016/j.jsm.2019.04.003

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…Previous measurements carried out in this waste showed that the 232 Th activity concentration has mean value of 1,141 Bq kg -1 , reaching up to 5,056 Bq kg -1 , depending on the lithological domain it comes from [7].…”

Section: Figure 1: Process Of Niobium Beneficiationmentioning

confidence: 76%

Th-232 Radiological Aspects of Carbonate Niobium Mining Waste Use as Agricultural Amendment

et al. 2023

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The use of mining residues in agriculture may be possible, as long as there be previous studies in different areas, one of them being the analysis of the involved radionuclides behavior. This study determined the concentrations of 232Th activity in soil, soil treated with lime, soil with carbonate residue from niobium mining, soil with the mixture of lime and carbonate, in two moments. The transfer factor of 232Th from the soil to the plant was analyzed, in this case, lettuce (n=20), in the different types of treatment and in two moments. The addition of carbonate to the soils did not significantly alter the levels of radioactivity for 232Th radionuclide in lettuce. The effective dose resulting from the lettuce ingestion varied from 0.09 to 0.3 µSv y-1.

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Section: Figure 1: Process Of Niobium Beneficiationmentioning

confidence: 76%

Th-232 Radiological Aspects of Carbonate Niobium Mining Waste Use as Agricultural Amendment

et al. 2023

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“…Therefore, an extremely strict waste management policy must be employed to mitigate the damage caused by the niobium mining and processing industries, especially due to the potential radiological hazard of the waste. A long-term prediction of non-processed waste radioactivity of the Catalão mine has been developed, and radiological hazard indices found were higher than the reference values or the global average (El Hajj et al, 2019). This fact raises some important concerns since the Brazilian authorities have shown special interest in Nb mining.…”

Section: Niobium In Brazilmentioning

confidence: 99%

Uso de compostos de nióbio como catalisadores na produção de biocombustíveis: uma revisão

Moreira¹,

Souza²,

Silva³

et al. 2022

J. Eng. Exact Sci.

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A necessidade de substituir combustíveis fósseis por biocombustíveis não é um tema recente na comunidade acadêmica. Pesquisadores estudam e desenvolvem combustíveis alternativos há décadas e, com isso, combustíveis como o biodiesel e o etanol de primeira geração se consolidaram no mercado. No entanto, esses biocombustíveis de primeira geração competem com a indústria de alimentos, o que afeta sua oferta e preço. Por outro lado, os combustíveis de segunda geração são produzidos a partir de biomassa lignocelulósica e resíduos orgânicos de atividades urbanas e agroindustriais, não competindo com a indústria de alimentos. No entanto, a maioria desses processos ainda não é economicamente viável. Duas das principais contribuições para essa inviabilidade são o baixo desempenho dos processos (baixa conversão da matéria-prima e baixa seletividade dos produtos de interesse) e o alto custo dos catalisadores, que muitas vezes são feitos de metais nobres de pouca disponibilidade. O Nióbio é um metal com diversas aplicações, mas ainda pouco explorado industrialmente como catalisador, apesar de possuir propriedades interessantes para essa finalidade. Este artigo de revisão compila trabalhos envolvendo o uso do nióbio e seus compostos como catalisador em diversos processos de produção de biocombustíveis, como esterificação, pirólise, liquefação, síntese Fischer-Tropsch, desoxigenação, entre outros. Além da revisão da literatura, este artigo apresenta uma análise crítica a respeito das aplicações de cada processo e tecnologia, bem como das pesquisas desenvolvidas pelos autores.

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“…In Brazil, the majority of the population perceives the mineral sector as having a significant environmental impact (Oliveira Cruz and da Cunha Rodovalho 2019), especially after the recent collapse of two tailings dams. Therefore, the mining sector is seeking new exploitation technologies to minimise its environmental impact, such as reducing the tailings by separating the coarse grained particles (Shouhouhi and Williams 2017), while meeting market demand (El Hajj et al 2019; Brandao Gomes et al 2015; Stohard and Laurence 2014; da Cunha Rodovalho and Eyer Cabral 2014). Bauxite mines usually store the waste as construction material for safety berms, reshaping the terrain and for haul road maintenance.…”

Section: Introductionmentioning

confidence: 99%

Impact assessment of waste screening over the life of a Brazilian bauxite mining operation

et al. 2020

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The mining sector is looking for new technologies to minimise its environmental impacts and to maximise its reserves. The need to increase the life of mines has led to investigations considering the options to maximise Brazilian bauxite mine reserves. This work evaluates the use of a flip screen in the loader bucket to recover ore from the overburden. The study investigates both the financial and technical feasibilities of this option. This device results in a decrease in the amount of waste and an increase in the life of mine. An average mass recovery of 48% is achieved. The concentration of the bauxite present in the overburden is possible using only screening and the oversized (>12.7 mm) product contains 40% of the available alumina, with less than 4% reactive silica and 0.5% organic carbon, which is acceptable for the Bayer process.

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Long-term prediction of non-processed waste radioactivity of a niobium mine in Brazil

Cited by 7 publications

References 13 publications

Th-232 Radiological Aspects of Carbonate Niobium Mining Waste Use as Agricultural Amendment

Th-232 Radiological Aspects of Carbonate Niobium Mining Waste Use as Agricultural Amendment

Uso de compostos de nióbio como catalisadores na produção de biocombustíveis: uma revisão

Impact assessment of waste screening over the life of a Brazilian bauxite mining operation

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