Influence of Process Parameters on Zinc Powder Produced by Centrifugal Atomisation

Abstract

An experimental centrifugal atomiser was used to study the manufacture of zinc powder. Melt temperature, melt flow rate, rotating speed and diameter of the atomising disc, are operating parameters that were varied, and their effects on powder quality and yield were observed. The median particle size and the particle size distribution tended to be better, i.e. smaller and narrower, with increasing rotating speed, melting temperature, and atomising disc size. With decreasing melt flow rate, the median particle size decrease and the particle size distribution is similar, all curves are almost overlapping. The yield of zinc powder increased with rotating speed and disc size, and decreased with melt flow rate. Apparent densities of zinc powder were in the range from 1.65 to 2.51 g/cm 3 . In SEM micrographs most zinc particles were irregular in shape, and the particle structure was mainly cellular based on optical imaging after etching of a polished surface.

Discharge performance of Zn‐air fuel cells under the influence of Carbopol 940 thickener

“…They examined the influence of these concentrations on the morphology of the anode. They also stated that studies on the concentration variation of Zn powder will be their future perspective . Novel aluminum oxide–coated Zn powder was used for anode gel preparation in ZAFCs.…”

“…A step ahead to prove that the contemporary nature of this study is where the Zn powder used for preparation of the Zn gel was subjected to concentration analysis. There are researches conducted with Zn powder for preparation of Zn gel anode in ZAFCs . But as far as our knowledge is concerned, there are no studies on optimization of its concentration and detailed reports on its influences on the fuel cell production.…”

“…They also stated that studies on the concentration variation of Zn powder will be their future perspective. 24,25 Novel aluminum oxide-coated Zn powder was used for anode gel preparation in ZAFCs. Scanning electron microscopy observations of the Zn powder morphology in Zn porous anode under gelling and non-gelling conditions was performed by Puapattanakul et al 26 They have not considered the augmentation of Zn powder concentration.…”

“…There are researches conducted with Zn powder for preparation of Zn gel anode in ZAFCs. 20,[24][25][26][27] But as far as our knowledge is concerned, there are no studies on optimization of its concentration and detailed reports on its influences on the fuel cell production. The vital suggestions declared in F I G U R E 9 Comparison of different air flow rates in power generation this study can be of great significance for future applications of ZAFCs.…”

Spinning disk atomization: Theory of the ligament regime

“…1). It should be noted that, as the last term in (15) indicates, expressions (14)- (16) are for the components of velocity in the observer's reference frame so that, to obtain the corresponding components in the coordinate frame rotating with the disk, the last term on the right-hand side of (15) should be taken out. Thus, to find the dominating wave solution for a given wave frequencyω, one needs, first, to calculate the characteristic film thickness H from (5) and the local values of the similarity parameters δ and E from (6) and (7).…”