Covering ability of aluminum pigments prepared by milling processes

Svěrák, Tomáš; Bulejko, Pavel; Krištof, Ondřej; Kejı́k, Pavel; Kalivoda, Josef; Horský, Jaroslav

doi:10.1016/j.powtec.2016.10.012

Cited by 7 publications

(2 citation statements)

References 42 publications

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“…This includes, for example, CO 2 and VOC removal [1][2][3], flue gas desulphurization [4][5][6], and ammonia separation [7]. Last but not least, scrubbing systems have widely been recognized in separation of particulate matter [8][9][10][11][12], the release of which is due mostly to various combustion processes [13][14][15] and, for example, comminution technologies [16,17]. This is very important due to associated health and environmental concerns [18,19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Spray Breakup in Turbulent Atomization Using a Spiral Nozzle

2019

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Spiral nozzles are widely used in wet scrubbers to form an appropriate spray pattern to capture the polluting gas/particulate matterwith the highest possible efficiency. Despite this fact, and a fact that it is a nozzle with a very atypical spray pattern (a full cone consisting of three concentric hollow cones), very limited amount of studies have been done so far on characterization of this type of nozzle. This work reports preliminary results on the spray characteristics of a spiral nozzle used for gas absorption processes. First, we experimentally measured the pressure impact footprint of the spray generated. Then effective spray angles were evaluated from the photographs of the spray and using the pressure impact footprint records via Archimedean spiral equation. Using the classical photography, areas of primary and secondary atomization were determined together with the droplet size distribution, which were further approximated using selected distribution functions. Radial and tangential spray velocity of droplets were assessed using the laser Doppler anemometry. The results show atypical behavior compared to different types of nozzles. In the investigated measurement range, the droplet-size distribution showed higher droplet diameters (about 1 mm) compared to, for example, air assisted atomizers. It was similar for the radial velocity, which was conversely lower (max velocity of about 8 m/s) compared to, for example, effervescent atomizers, which can produce droplets with a velocity of tens to hundreds m/s. On the contrary, spray angle ranged from 58° and 111° for the inner small and large cone, respectively, to 152° for the upper cone, and in the measured range was independent of the inlet pressure of liquid at the nozzle orifice.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Spray Breakup in Turbulent Atomization Using a Spiral Nozzle

2019

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“…This have given rise to the development of a technology for the production of a number of pigments with a "metallic" effect with new consumer properties. Thus, an experimental study was conducted in [3] aimed at determining the optimal milling parameters for producing pigment pastes from aluminum during wet milling. Obtaining flakes from spherical aluminum particles requires a special approach during milling and this process is described by the two-stage model: at the first stage of milling, the material absorbs energy required for the formation of disc-shaped plate-like particles from the initial spherical ones and at the second stage, the portion of energy is required for the milling of disc-shaped plates into smaller ones with irregular shapes.…”

Section: Introductionmentioning

confidence: 99%

The influence of wet milling of aluminum and aluminum alloys powder screenings on the characteristics of the aluminum-based pastes

Егоров¹,

Kozlov²,

Mamaeva³

et al. 2019

Nanosystems: Phys. Chem. Math.

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The milling of aluminum powders in non-aqueous solvents is used in the production of high-quality pigment pastes of flake shapes with thickness from some microns to hundreds of nanometers. In Russia, such pigments are not produced at a large scale, however, spherical powders made from aluminum and its alloys are manufactured. Starting the production of pigments from screenings of powder production will not only solve the problem of fine fractions disposal, but also reduce the cost of the target fractions powders. The fraction of powders with an average d50 of less than ∼20 µm should be disposed. In this research, by varying the laboratory conditions, the parameters for milling screenings of A8 aluminum powder, AK9ch and 1201 aluminum alloys were selected. The milling was performed in non-aqueous solvents: a highly refined commercial petroleum solvent and liquid paraffin oil. The prospects of using wet milling for the manufacture of pigment pastes from alloys has been demonstrated including average thicknesses of the flakes about 40-80 nm. Thus, it has been demonstrated that wet and bead grindings lead to thinning of metal powder particles to thicknesses of less than 100 nm.

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