Wall effects on particle separation in air jigs

Ambrós, Weslei Monteiro; Cazacliu, Bogdan; Sampaio, Carlos Hoffmann

doi:10.1016/j.powtec.2016.06.034

Cited by 19 publications

(11 citation statements)

References 22 publications

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“…The management of the gravimetric concentration processes using a vertical bed favored the concentration process of this type of material, taking advantage of the significant difference in the densities between the ashes and the metallic material (Lai & Lu, 2003). The low density of the ash and the management of a vertical water bed, i.e., the use of a system in a humid environment, contributed to an almost total separation of the metal of interest from the undesirable material (Ambrós, Cazacliu, 2016;Ambros, Sampaio, et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…The handling of a JIG screen using a liquid medium, facilitates the processing of ash of various morphologies and sizes to the use of the Wilfley table and the mechanical screen, which require specific sizes of particles or a similar morphology within the system. This generates a limitation during the recovery process of the metal present within the ashes produced by pyrolysis (Ambrós, Cazacliu, 2016;Ambros, Sampaio, et al, 2016). The morphology of the metallic material and the ash particles are important factors that prevent an optimal recovery of the metal within the Wilfley tables (Legorreta-García et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

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Recovery of copper through concentration processes from ashes produced by WEEE pyrolysis

Rojas-Arias¹,

Rojas-Arias²,

Medrano-Rivera³

et al. 2021

JART

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The process of recovering metals from electronic waste has become an important topic in recent years. In this work, the recovery of electrolytic copper from the ashes produced during the pyrolysis process of waste electrical and electronic equipment (WEEE) was sought. Three gravimetric separation equipment were used: Wilfley table, JIG screen, and mechanical screen. This last method was used with and without previous grinding processes. The ashes were initially characterized by XRD to determine the phases present. The initial concentration of the ashes was carried out by physicochemical classification. The results obtained show that the JIG sieve separation processes obtained the best performance, reaching a percentage of about 87% of recovery of the metal present within the WEEE ashes during 16 minutes. The application of a vertical gravimetric separation system on material samples with a fairly wide density difference allowed an optimal separation system for the metallic material and the produced ash. On the other hand, the application of screens in the recovery of the metal obtains values much lower than those obtained by JIG sieve.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Recovery of copper through concentration processes from ashes produced by WEEE pyrolysis

Rojas-Arias¹,

Rojas-Arias²,

Medrano-Rivera³

et al. 2021

JART

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“…By using color, gravity concentration, color, and X-ray separation techniques in the present literature, the maximum concrete proportion can be obtained larger than 90 wt.% [ 12 , 13 , 15 ]. Due to the proposed method and its operation cost, the above-mentioned techniques and the devices only were reported on a laboratory scale.…”

Section: Resultsmentioning

confidence: 99%

“…[ 10 , 11 ]. Advanced automated sorting techniques by gravity concentration, color, X-ray, near-infrared, and spectral parameters have been successfully researched and developed to upgrade the quality of recycled aggregates [ 12 , 13 , 14 ]. In the field of CDW recycling, the preliminary tests of brick/concrete automatic separation techniques based on gravity concentration were carried out on a laboratory scale [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Upgrading the Quality of Recycled Aggregates from Construction and Demolition Waste by Using a Novel Brick Separation and Surface Treatment Method

Chen

et al. 2020

Materials

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Mixed recycled aggregates (MRA) from construction and demolition waste (CDW) with high-purity and environmental performance are required for highway construction application in base layer and precast concrete curbs. The main problematic constituents that reduce the quality level of the recycled aggregates applications are brick components, flaky particles, and attached mortar, which make up a large proportion of CDW in some countries. This paper studies the potential of brick separation technology based on shape characteristics in order to increase the recycled concrete aggregates (RCA) purity for MRA quality improvement. MRA after purification was also processed with surface treatment experiment by rotating in a cylinder to improve the shape characteristics and to remove the attached mortar. The purity, strength property, densities, water absorption ratio, shape index, and mortar removal ratio of MRA were studied before and after the use of the brick separation and surface treatment proposed in this study. Finally, the recycled aggregates upgradation solution was adopted in a stationary recycling plant designed for a length of 113 km highway construction. The properties of CDW mixed concrete for precast curbs manufacturing were conducted. The results indicate that problematic fractions (brick components, particle shape, and surface weakness) in the MRA were significantly reduced by using brick separation and surface treatment solution. Above all, it is very important that the proposed brick separation method was verified to be practically adopted in CDW recycling plant for highway base layer construction and concrete curbs manufacturing at a low cost.

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“…The efficiency of the shelf pneumatic classificator is substantially determined by the flow field of the gas stream, which vice versa affects the concentration of the solid phase in the two-phase flow. Considering the character of gas flow is important for establishing the regularities of its interaction with the solid phase that determines the motion speed and particle residence time in the device's operating volume [8].…”

Section: Conducting a Computer Modellingmentioning

confidence: 99%

Modelling of Separation and Air Classification Processes of Aerodisperse Systems in the Shelving Device

Varukha¹,

Смирнов²,

Edl³

et al. 2018

JES

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The following paper considers the process of classification of polydisperse free-flowing material according to granulometric composition using a gravitational air classificator. There were considered the problems of the purity of separation of polydisperse bulk materials and methods for increasing the degree of separation of particles. There were presented and analyzed obtained the results of the comparison, the data of experimental research and computer simulation of two-phase hydrodynamics flow by CFD methods. The versatility of this complex allowed carrying out simulation of the process using various parameters. As a result, were obtained optimal operating parameters, which were experimentally verified. Based on the obtained data as a result of numerical modelling, the possibility of increasing gas flow influence to the polydispersed material were found, as well as organization along the walls of coarse fraction downward flow by dint of the optimizing the devise design (specifically through the organization of additional inlets for airflow) were obtained.

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Wall effects on particle separation in air jigs

Cited by 19 publications

References 22 publications

Recovery of copper through concentration processes from ashes produced by WEEE pyrolysis

Recovery of copper through concentration processes from ashes produced by WEEE pyrolysis

Upgrading the Quality of Recycled Aggregates from Construction and Demolition Waste by Using a Novel Brick Separation and Surface Treatment Method

Modelling of Separation and Air Classification Processes of Aerodisperse Systems in the Shelving Device

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