Vacuum Filtration – System and Equipment Technology, Range and Examples of Applications, Designs

Tomasko, Franz

doi:10.1002/9783527653898.ch18

Cited by 1 publication

(1 citation statement)

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“…The preferred cake filtration devices is the conventional belt filter, as it has a simple design and can achieve high throughputs due to continuous operation. For fine materials, the limited pressure difference generated by a vacuum is not sufficient to remove enough liquid, which is why discontinuous filter presses are mainly used in this case [26,27]. Although additional compression devices on belt filters improve deliquoring, the belt filter requires an extra design for such high loads, requiring costly constructive modifications, which deviate tremendously from the conventional, simple design of the belt filter [22].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Dewatering of Homogeneous and Segregated Filter Cakes by Vibration Compaction

Yildiz,

Stankovic,

Zolg

et al. 2024

ChemEngineering

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The solid volume fraction of a slurry requiring solid–liquid separation often fluctuates in industrial cake filtration processes. For low solid volume fractions, particle segregation arises, resulting in an inhomogeneous filter cake structure. Particle segregation has significant impacts on cake formation such as a longer cake formation time compared to homogeneous cakes. This work addresses the impact of this effect on vibration compaction, which is an alternative deliquoring method applying oscillatory shears to the filter cake. The dewatering results of homogeneous and segregated cakes made of the same material with a broad particle size distribution are compared. Although cake deliquoring is achievable despite particle segregation, vibration compaction is more effective for homogeneous cakes. The reason is that no particle size homogenization within segregated cakes occurs due to oscillatory shear, as particle size analyses indicate. The particle size measurements of cakes before and after vibration compaction reveal that the material’s particle size distribution is preserved despite vibration application. Vibration compaction achieves higher deliquoring than the common compaction method by squeezing, as elastic recovery effects after squeezing lead to the reabsorbing of liquid, already expressed and stored in the filter cloth. This demonstrates that vibration compaction is a real alternative for cake deliquoring.

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Section: Introductionmentioning

confidence: 99%