Abstract:A mineração iniciou suas atividades lavrando depósitos de alto teor, sem preocupação em maximizar seu aproveitamento. Ainda hoje, milhões de toneladas de minerais úteis são descartados anualmente para as barragens de rejeitos. Nesse trabalho, foram realizados testes de deslamagem e flotação com lamas de minério de ferro, primeiramente em escala de bancada. Várias dosagens de coletor e depressor foram utilizadas. Os resultados promissores dos testes em escala de bancada levaram a testes em escala-piloto. Foi co… Show more
“…become necessary to use low-grade iron ores, fines, and slimes to meet growing demands [2]. Therefore, the mining sector recognizes the need for improvement and seeks to determine new techniques that will improve the recovery and productivity of mineral deposits [3] with the ultimate aim of recovering a greater proportion of the metallic content and using previously discarded granulometric fractions [4].…”
Technological characterization was used to define an iron ore processing route for the fraction (-8.00 +3.00 mm) with 55.00% of Fe content and 17.20% of SiO 2. Even having a considerable content of iron, this fraction was stored in waste piles since there was no previously interest for this fraction processing in the iron ore treatment facility of Mineração Congonhas in Catas Altas, Brazil. The characterization comprised mineralogical, chemical, granulometric and density analyzes. For the identification of the optimum process route two concentration methods were used, both in a bench scale and using a rougher stage: Route 1 consisted of a jigging and Route 2 used magnetic separation. The optimum concentration was encountered using the magnetic separation circuit, where the mass and metallurgical recovery were, respectively, 86.60% and 95.96, with a concentrate of 60.94% Fe and 10.91% SiO 2 content, which can then be further processed in a cleaner stage to meet the company's requirements.
“…become necessary to use low-grade iron ores, fines, and slimes to meet growing demands [2]. Therefore, the mining sector recognizes the need for improvement and seeks to determine new techniques that will improve the recovery and productivity of mineral deposits [3] with the ultimate aim of recovering a greater proportion of the metallic content and using previously discarded granulometric fractions [4].…”
Technological characterization was used to define an iron ore processing route for the fraction (-8.00 +3.00 mm) with 55.00% of Fe content and 17.20% of SiO 2. Even having a considerable content of iron, this fraction was stored in waste piles since there was no previously interest for this fraction processing in the iron ore treatment facility of Mineração Congonhas in Catas Altas, Brazil. The characterization comprised mineralogical, chemical, granulometric and density analyzes. For the identification of the optimum process route two concentration methods were used, both in a bench scale and using a rougher stage: Route 1 consisted of a jigging and Route 2 used magnetic separation. The optimum concentration was encountered using the magnetic separation circuit, where the mass and metallurgical recovery were, respectively, 86.60% and 95.96, with a concentrate of 60.94% Fe and 10.91% SiO 2 content, which can then be further processed in a cleaner stage to meet the company's requirements.
“…The consumption of iron ore is concentrated in the steel industry (pig iron) and pelletizing plants (pellets) [2,3]. However, the iron ore beneficiation stages generate large amounts of industrial by-products or tailings [4]. Boscov [5] reported that for each ton of iron ore produced, on average, 0.5 ton of tailings are eliminated, a mass ratio between the final product and the tailings produced of 2:1.…”
Artificial stone materials (ASM) were produced with an iron ore tailing (IOT) from the disruption of Fundão’s tailing dam, located in Mariana, Minas Gerais State, Brazil. The IOT was separated in 3 powders with different particle sizes: DAG (<600 μm), DAR (600 to 75 μm), and DSA (<75 μm); then, each powder was characterized and mixed with a polymer resin (polyester or epoxy). ASM samples were prepared using the transfer molding technique; vacuum vibration technology was also applied to half of the samples. After curing, the ASM samples were characterized for mechanical properties and physical parameters. The microstructure of polished ASM samples was also analyzed by scanning electron microscopy. All results indicated that ASM samples produced with epoxy resin were superior to the samples made with polyester resin. The features found for the different compositions and shaping conditions for the produced ASM samples can allow various applications for these alternative materials in the construction industry, such as floor and wall tiles, providing a means of reducing the amount of IOT deposited in the tailing dams and adding economic value to this waste.
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