Powder mixing: Some practical rules applied to agitated systems

Poux, Martine; Fayolle, Patrice; Bertrand, J.; Bridoux, D.; Bousquet, Jacques

doi:10.1016/0032-5910(91)80047-m

Cited by 278 publications

(129 citation statements)

References 95 publications

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“…Thus good dispersive mixing, to ensure powder homogeneity, is crucial for efficient and reliable combustion [3,8,9]. Good dispersion and mixing of nano-reactants is also essential for achieving maximum burning rates in a pyrotechnic mixture [10].…”

Section: Introductionmentioning

confidence: 99%

The effect of Si–Bi2O3 on the ignition of the Al–CuO thermite

et al. 2011

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The ignition temperature of the Al-CuO thermite was measured using DTA at a scan rate of 50 C.min -1 in a nitrogen atmosphere. Thermite reactions are difficult to start as they require very high temperatures for ignition, e.g. for Al-CuO thermite comprising micron particles it is ca. 940 C. It was found that the ignition temperature is significantly reduced when the binary Si-Bi 2 O 3 system is added as sensitizer. Further improvement is achieved when the reagents are nano-sized powders. For the composition Al + CuO + Si + Bi 2 O 3 (65.3:14.7:16:4 wt %), with all components nano-sized, the observed ignition temperature is ca. 613 C and a thermal runaway reaction is observed in the DTA.

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Section: Introductionmentioning

confidence: 99%

The effect of Si–Bi2O3 on the ignition of the Al–CuO thermite

et al. 2011

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“…(1951) studied the mixing process for weeds and crops, and determined the dispersion of homogeneity in a unit weight. Poux M. et al (1991) also made a careful review of many different mixing indices.…”

Section: Introduction To Some Mixing Indicesmentioning

confidence: 99%

A Study of the Mixing Index in Solid Particles

Chou¹,

Song²,

Hsiau³

2017

KONA

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This study focuses on investigating the mixing state by different mixing indices for different pre-organized particles. We also try to propose a new mixing index and discuss the advantages and disadvantages of different cases. The results show that the Avg. distance mixing index indicates the degree of mixing more accurately than other mixing indices for a case of complete segregation. In some cases the degree of mixing would be higher with the Lacey mixing index compared with the other indices, with the size of the cells greatly affecting this value. In other words, the use of any single specific mixing index on its own cannot accurately reflect the correct degree of mixing for all different kinds of systems. The only difference between mixing indices is which one can provide more accurate and stable results.

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Section: Introductionmentioning

confidence: 99%

“…The selection of a mixer for a mixing operation depends on the product uniformity required and many other factors [1]. Ribbon mixers are considered to be suitable for mixing dry powders as well as free-flowing granular material [1]. It is also reported that a ribbon mixer can produce an improved homogeneity in powder mixing because of large shear stresses in the mixer as well as that it can handle mixing of different size particles [2].…”

Section: Introductionmentioning

confidence: 99%

Mixing behaviour of cohesive and non-cohesive particle mixtures in a ribbon mixer

Musha

Dong

Chandratilleke

et al. 2013

AIP Conference Proceedings

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Abstract. Ribbon mixers are used in a wide range of applications involving pharmaceuticals, ceramics and cosmetics, to name a few. Here, the discrete element method is used to investigate the effect of impeller speed on the mixing behaviours of cohesive as well as non-cohesive particle mixtures in a ribbon mixer, which has a horizontal cylindrical vessel. The mixing behaviours are characterized by particle-scale and macroscopic mixing indexes. Simulations show that the mixing rate increases with the impeller speed for both the cohesive and non-cohesive mixtures up to a certain speed, beyond which it showed a reduction. There is a possibility that the mixture quality becomes poorer at higher impeller speeds for the non-cohesive particles, but it was not the case with the cohesive particles. Inspection of velocity fields shows that many local recirculation regions exist in the case of non-cohesive particle mixing, preventing the overall mixing. By contrast, in the case of the cohesive mixture, there exists a circumferential motion about the shaft and a convective motion in the horizontal axial direction, improving the particle mixing. Force analyses are also carried out, which show that the particle contact forces increase with the impeller speed for non-cohesive particles, but in the case of cohesive particles, they increase initially with the impeller speed, and then show a reduction after a certain speed. The results will be useful in selecting operation conditions of a ribbon mixer.

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Powder mixing: Some practical rules applied to agitated systems

Cited by 278 publications

References 95 publications

The effect of Si–Bi2O3 on the ignition of the Al–CuO thermite

The effect of Si–Bi2O3 on the ignition of the Al–CuO thermite

A Study of the Mixing Index in Solid Particles

Mixing behaviour of cohesive and non-cohesive particle mixtures in a ribbon mixer

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