Limestone Mining
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Optical sorting technology for waste management from the Boukhadra iron ore mine (NE Algeria)
Abstract Mining processes in the iron ore mine of Boukhadra, Tebessa (NE Algeria) generated thousands of tons of mining wastes every year, which represents a real threat to the environment, leading to hazardous effects for the resident population of the region. The aim of this study is the selective sorting of the Boukhadra mining wastes for valorization. Th
REM - International Engineering Journal. Publicado em: 2022
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2. SALITRE: O PRODUTO QUÍMICO ESTRATÉGICO NO PASSADO DO BRASIL
Saltpeter demanded for a long-time strategic attention in view of its importance in the form of gunpowder by the governments of many nations. The sources of this mineral in Brazil were almost always associated to the soil in caves, which was extracted because of a limited amount of that precious salt. The first references pointed out that saltpeter was first
Quím. Nova. Publicado em: 2021-04
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3. Crescimento e teor de cromo em mamoneira cultivada em solo receptor de resíduos de curtume e carboníferos
RESUMO A produção de resíduos tem aumentado em proporção direta com a industrialização dos países. Sendo assim, a disposição adequada desses resíduos é uma questão largamente discutida entre os órgãos ambientais. Por isso, o objetivo deste trabalho foi estudar o efeito residual de adições sucessivas de resíduos de curtume e da mineração d
Eng. Sanit. Ambient.. Publicado em: 20/12/2019
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4. Durability of Soil-Cement Blocks with the Incorporation of Limestone Residues from the Processing of Marble
The great environmental impact caused by mineral production has forced mining and ornamental stone industries to acquire new concepts and technical solutions in order to develop eco-friendly and sustainable activities. In this context, this work aims to study the durability of soil-cement block with the incorporation of limestone residues from the processing
Mat. Res.. Publicado em: 04/06/2018
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5. THE USE OF A HIGH LIMESTONE CONTENT MINING WASTE AS A SORBENT FOR CO2 CAPTURE
Abstract In this work, a high limestone content waste was evaluated as a potential material for CO2 capture. The influence of calcination conditions on the CO2 capture capacity was evaluated using 5 cycles of calcination-hydration-carbonation reactions. A Central Composite Design of Experiments was set using calcination temperatures and time as variables. Th
Braz. J. Chem. Eng.. Publicado em: 2016-09
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6. Evidences of the influence of the detonation sequence in rock fragmentation by blasting – Part I
Drilling and blasting are fundamental operations in the mining cycle and consti tute an important component of the mining costs. Rock fragmentation can in principle be managed by means of two options: by increasing or reducing the specific consumption of explosives, or by modifying the drilling pattern. The choice of one or other type of control depends on t
Rem: Rev. Esc. Minas. Publicado em: 2015-09
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7. Arbuscular mycorrhizal fungi in a semi-arid, limestone mining-impacted area of Brazil
The main goal of this study was to determine the diversity and activity of arbuscular mycorrhizal fungi (AMF) in an area degraded by limestone mining within the semi-arid region of Brazil known as the caatinga (shrublands). Near a limestone quarry, we selected two areas of caatinga (preserved and degraded) for study. The number of glomerospores did not diffe
Acta Bot. Bras.. Publicado em: 2013-12
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8. Capital humano, oportunidades de trabalho e incentivos públicos: motivações e decisões da família quanto ao investimento em ensino superior / Human capital, job opportunities and public incentives: family motivations and decisions regarding investment in higher education
The research presented in this dissertation consisted of a study with theoretical basis in the human capital theory, whereby the higher the educational level of an individual, the higher will be his or her salary. However, in Brazil, where a significant part of the population is classified as poor, there are less public assets for investment in human capital
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/04/2011
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9. Krigagem com deriva externa aplicada à avaliação de recursos minerais de calcário e de minério laterítico / Kriging witch external drift applied to evaluation of mineral resources of limestone and lateritic ore
This dissertation is a work on applied geostatistics to evaluation of mineral resources. This application can be considered as the last step to such the task. The basic concepts are based on current geostatistics, with extensive use of informatics resources. The first goal of this work was to test the technique named kriging with external drift in the evalua
Publicado em: 2010
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10. Estudo da remoção de manganês de efluentes de mineração utilizando cal, calcário e dióxido de manganês / Study of manganese removal from mining effluent using lime, limestone and manganese dioxide
Manganese is a common component of acid mine drainage (AMD). Due to its high solubility over a wide pH range, it is notoriously difficult to remove it from contaminated waters. The AMD that occurs in Mineral Industrial Complex of Poços de Caldas (CIPC) which belongs to the Nuclear Industries of Brazil (INB), is due to the great amount of su
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/06/2009
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11. Efeito de alterações do habitat na composição e estrutura da comunidade de aves de sub-bosque no Planalto Paulista, Sudeste do Brasil / Effects of habitat modification in the composition and structure of the understory bird community of Planalto Paulista, Southern Brazil
Birds are one of the traditionally studied groups on environmental impact assessments, which seek to understand the effects of human activities on communities and/or populations. This understanding is essential to create guidelines for future enterprises or for planning the use of land, with the objective of mitigating the negative effects of human activitie
Publicado em: 2008
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12. Neutralização de drenagem ácida de minas com escória de aciaria elétrica do forno-panela
The acid mine drainage (AMD) is formed when certain sulfide minerals are exposed to oxidizing conditions. The AMD is commonly associated with coal mining, especially in coal waste deposits that contain high pyrite (FeS2) concentration. The neutralization of AMD using alkaline materials, like limestone and steel slag is one of the useful remediation technique
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2007