Survey of characterization techniques of dry ultrafine coals and their relationships to transport, handling and storage

Rastogi, S.; Dhodapkar, Shrikant; Cabrejos, Francisco J.; Baker, Janice M.; Weintraub, M.; Klinzing, George E.; Yang, Wen‐Ching

doi:10.1016/0032-5910(93)80007-w

Cited by 17 publications

(5 citation statements)

References 8 publications

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“…The fact that tapped density is highly dependent on the number of tapping was also approved by Abdullah [25]. Rastogi et al [22] analysed the HR of ultrafine coals and found that even after[1000 taps the ratio did not reach a steady state. Furthermore, measuring bulk and tap powder densities is comparably far away from the situation in a powder-bed-based AM process (SLM), where small amounts of powders are more or less ''dynamically'' put on the built platform and on the last already solidified layer of the part.…”

Section: Hausner Ratio Hrmentioning

confidence: 99%

“…Therefore, own experiences show that HR does not nicely correlate with an optical evaluation of flowability and that different powders are not well differentiated, which is supported by Soh [21], who further reports that HR does not nicely correlate with more sophisticated measurement techniques. Furthermore, although the measurement of bulk and tap density is comparably easy, especially for the tap density it is well known that powders often do not reach stable density values within a reasonable number of tapping cycles [22]. Miyajima [23] showed that the change in void volume fraction of packed powder beds can be estimated, but it might be necessary to apply [100 taps to reach a more or less stable situation depending on particle shape.…”

Section: Hausner Ratio Hrmentioning

confidence: 99%

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Powder flowability characterisation methodology for powder-bed-based metal additive manufacturing

et al. 2015

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Key in powder-bed-based additive manufacturing is the use of appropriate powder materials that fit to the process conditions. There are many parameters affecting the build process and the corresponding quality of the parts being built. Therefore, an accurate assessment of the powders becomes important. Such an assessment involves, besides others, the powder flowability, which should be sufficient in order to create good-quality powder layers. The current study aims at the development of suitable parameters and values for the qualification of metal powders for selective laser melting (SLM) with regard to their flowability. The powder flowability is assessed by the statistical analysis of the measured powder avalanche angles and the powder surface fractal, which give valuable information about the significance of inter-particle forces. A set of 21 different Fe-and Ni-based powders has been analysed and good correlations between the powder avalanche angles, the surface fractal and the particle shape with the optically evaluated flowability could be derived. The method allows a quantitative powder flowability assessment, which correlates with the experiences for powders for powder-bed-based additive manufacturing, especially for SLM.

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Section: Hausner Ratio Hrmentioning

confidence: 99%

Section: Hausner Ratio Hrmentioning

confidence: 99%

Powder flowability characterisation methodology for powder-bed-based metal additive manufacturing

et al. 2015

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“…As can be seen in Figure , the shape of enriched agglomerated cornstarch tended to be spherical, more than the agglomerated cornstarch without quercetin‐loaded lyophilized liposomes (Figure C). An agglomerated powder with spherical structure is probably less cohesive, due to decrease of the physical entanglement between the particles (Rastogi and others ; Teunou and others ).…”

Section: Resultsmentioning

confidence: 99%

Production of Cornstarch Granules Enriched with Quercetin Liposomes by Aggregation of Particulate Binary Mixtures Using High Shear Process

Toniazzo

Galeskas

Dacanal

et al. 2017

Journal of Food Science

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This study is an unprecedent association of 2 technologies, nanoencapsulation and wet agglomeration, here used together to enrich cornstarch with quercetin. The agglomeration process was used to obtain granules of cornstarch, an ingredient extremely used in the food industry, enriched with quercetin-loaded lyophilized liposomes. The goals were both the improvement of the nutritional quality and the increase of the added value of the cornstarch.

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“…The initial objective was to simulate the flow through a physical model (Figure 1), based on Rastogi et al (1993) and Silva (2005), in order to obtain parameters for assessing the flowability of the bulk material under a certain slope condition, characteristic of the wall surface and moisture content. The chute or trough simulates the behavior of the gravity flow of bulk solids in a straight chute (Figure 1).…”

Section: Controlled Slope Chutementioning

confidence: 99%

Method for quick assessment of cohesive ore flowability

Gonçalves

Luz

2022

RSD

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Beneficiation of iron ore with natural moisture has become increasingly relevant, either due to restrictions on wet operations, which result in disposal of tailings in dams, or due to the possibility of ready blending of various ore types. A great difficulty in these operations is handling of hydrated ores, with the presence of clay minerals, or with a higher moisture content. Effective techniques to facilitate handling emerge as the main challenge to make it possible to treat these ores under natural moisture in different plants around the world. This work aims at presenting a method for expeditious appraisal of the flowability of cohesive ore. A sample of iron ore from Mina do Pico, Brazil, was used in this study. The flowability was investigated under different conditions, using a bench scale rectangular trough with controlled slope. The following liners were studied: ASTM A-36 carbon (CDP), ultra-high molecular weight polyethylene (UHMW), Hardox, natural rubber, Arcoplate and polyurethane. UHMW resulted in the best flow efficiency and the lowest friction angle between bulk ore and the lined wall. Vibration as an ancillary agent for mechanical discharge significantly improved the flow efficiency.

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Survey of characterization techniques of dry ultrafine coals and their relationships to transport, handling and storage

Cited by 17 publications

References 8 publications

Powder flowability characterisation methodology for powder-bed-based metal additive manufacturing

Powder flowability characterisation methodology for powder-bed-based metal additive manufacturing

Production of Cornstarch Granules Enriched with Quercetin Liposomes by Aggregation of Particulate Binary Mixtures Using High Shear Process

Method for quick assessment of cohesive ore flowability

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