Contaminant removal from manufactured fine aggregates by dry rare-earth magnetic separation

Miceli, Hayla; Rossi, Mateus G.; Neumann, Reiner; Tavares, Luís Marcelo

doi:10.1016/j.mineng.2017.07.017

Cited by 11 publications

(2 citation statements)

References 14 publications

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“…As frações magnéticas e não magnéticas foram caracterizadas por fluorescência de raios X e microscopia eletrônica de varredura, mostrando redução significativa no teor de Fe2O3 nas frações não magnéticas. Miceli et al (2017), ao caracterizar amostras de agregados finos indica que a composição mineralógica destas contém até 2,5% de hornblenda, representando um dos minerais magnéticos contaminantes.…”

Section: Introductionunclassified

Chemical and mineralogical characterization to define parameters for comminution, aiming at granulometric adequacy in rock rich in feldspars extracted in Pedra Lavrada-PB

Ferreira,

Farias Neto,

Bertolino

et al. 2024

CLIUM

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The demand for high purity feldspars with low contaminant content, especially for use in the manufacture of porcelain tiles and white crockery, poses a challenge for processing the ore. Due to the need for very low iron levels, less than 0.15%, operations must be more complex, costly and capable of providing a high purity final product. To this end, it is necessary to employ mineralogical and technological characterization to understand the ore and plan the operations of the processing plant. A sample of rock rich in feldspars collected in an extraction in the municipality of Pedra Lavrada/PB was studied, aiming to identify the chemical composition and release spectrum using XRD and SEM techniques. Aliquots were subjected to preparation, granulometric classification and high-intensity wet magnetic separation steps. The results indicate that the rock has high concentrations of feldspars, quartz and a significant content of magnetite and hornblende. The physical release of magnetic mineral phases occurs below 0.104mm, and fragmentation operations must be designed with this grain size standard in mind. Magnetic separation, with mass recovery of 14.01% in relation to the feed, satisfactorily guaranteed a reduction in the concentration of magnetic minerals in the ore

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Section: Introductionunclassified

Chemical and mineralogical characterization to define parameters for comminution, aiming at granulometric adequacy in rock rich in feldspars extracted in Pedra Lavrada-PB

Ferreira,

Farias Neto,

Bertolino

et al. 2024

CLIUM

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“…[6][7] In a recent work, it was demonstrated that dry high-intensity magnetic separation allowed removing partially biotite contained in an MFA from a gneiss rock, besides some other deleterious components and fines. 8 Another work demonstrated that the application of this technology resulted in a high-quality MFA for concrete, but was also responsible for production of a significant amount of waste, generated at a ratio of 1:4 in comparison to the MFA. 2 Some reports proposed the proper use of granite quarry waste and stone waste in cement-, [9][10] and polymer-based composites.…”

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Granitic quarry waste as a dual functional filler for high density polyethylene‐based composites: Mechanical and microwave absorbing properties

Moura

Soares

Indrusiak

et al. 2021

J of Applied Polymer Sci

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Cost-effective polymeric composites were successfully prepared by melt blending granitic quarry waste (GQW) with high-density polyethylene (HDPE). The GQW is a waste generated during the production of manufacture fine aggregates (MFA) from crushed gneiss rock and contains significant amount of mica with iron in its structure. Different sieving and milling procedures were employed. The materials were characterized by mechanical and dynamicmechanical properties and scanning electron microscopy. Moreover, the influence of the GQW on the microwave absorbing properties in the X-band frequency range was investigated. The presence of mica and iron compound in the GQW provides a dual function to the filler: toughening agent with microwave absorbing capacity. Indeed, the addition of 5 wt% of GQW previously sieved and milled by dry or wet-grinding approach resulted in composites with outstanding toughness, modulus and elongation at break. Simulated RL studies revealed electro-magnetic attenuation of À25 dB at 8.7 GHz. Such successful use of a waste generated in the production of a concentrate (MFA) not only contributes to the economics of the quarrying operation, but also to its environmental sustainability, since it replaces disposal of this product, which could lead to dust emissions, given its fine size and low moisture content.

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Recycling Technologies – Physical Separation

2021

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Contaminant removal from manufactured fine aggregates by dry rare-earth magnetic separation

Cited by 11 publications

References 14 publications

Chemical and mineralogical characterization to define parameters for comminution, aiming at granulometric adequacy in rock rich in feldspars extracted in Pedra Lavrada-PB

Chemical and mineralogical characterization to define parameters for comminution, aiming at granulometric adequacy in rock rich in feldspars extracted in Pedra Lavrada-PB

Granitic quarry waste as a dual functional filler for high density polyethylene‐based composites: Mechanical and microwave absorbing properties

Recycling Technologies – Physical Separation

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