Wiederbefeuchtung bei der Pressfiltration

Mazzi, Fabio; Krammer, Gernot

doi:10.1002/cite.202000105

Cited by 2 publications

(2 citation statements)

References 11 publications

(13 reference statements)

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“…This behavior impairs the deliquoring efficiency of squeezing. Mazzi and Krammerer [41] already observed this behavior for coal filter cakes under simultaneous compression and steady shear as in belt filter presses. Wiedemann [39] and Alles [37] observed elastic recovery behavior after compressing filter cakes of mineral, fibrous, deformable, and finely agglomerated particles.…”

Section: Frequencymentioning

confidence: 65%

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: Frequencymentioning

confidence: 65%

Mechanical Dewatering of Homogeneous and Segregated Filter Cakes by Vibration Compaction

Yildiz,

Stankovic,

Zolg

et al. 2024

ChemEngineering

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“…The installation described in the paper provides continuous recording of the amount of liquid released. The amount of moisture reabsorption after removing the compressive load from the samples was studied in [9]. A suspension based on coal dust was used as a test material.…”

Section: Introductionmentioning

confidence: 99%

Study of dehydration of organic sapropel by compression method

Tsiz,

Khomych,

Didukh

et al. 2023

22nd International Scientific Conference Engineering for Rural Development Proceedings

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In the Polissya part of the Volyn region of Ukraine there are mainly sod-podzolic soils, which are characterized by low natural fertility, so the application of fertilizers, especially organic ones, is a determining factor in obtaining high yields. For this region, a great reserve for increasing soil fertility is the use of sapropels as organic fertilizers. The potential of sapropels as an alternative source of organic matter for the preservation and reproduction of soil fertility in Ukraine as a whole is 140 million tons when converted to 60% moisture. In its natural state, sapropel is a colloidal system with a moisture content of 92...98%. Therefore, the main and most energy-intensive operation of its processing is dehydration. Studies have shown that free (capillary) moisture is the least energetically bound, it is held in the material mechanically due to its porous structure and can be extracted by compression. Known studies of this process are based on discrete measurements. Therefore, an automated system for measuring the amount of water released from sapropel in the process of its compression in a closed volume with information processing using computer technology was developed. To build an automated measuring device we used a strain gauge (SBR-1); analog to digital converter (NX 711); water flow sensor (YF-S401). As a controller Arduino UNO ATmega 328P-PU was used, and for signal processing on a computer – LabVIEW environment. To obtain a mathematical model of the studied process in the form of a regression equation, a symmetric non-compositional plan of the Box-Behnkin experiment of the second order was used. According to the obtained regression equation, the response surface was constructed. Based on the analysis of the response surface, it was found that it is possible to reduce the water content in the studied samples of organic sapropel from 94% to a minimum value of 72-74% at a sample pressure of 80-100 kPa and a holding time under load of 22-26 s.

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Wiederbefeuchtung bei der Pressfiltration

Cited by 2 publications

References 11 publications

Mechanical Dewatering of Homogeneous and Segregated Filter Cakes by Vibration Compaction

Mechanical Dewatering of Homogeneous and Segregated Filter Cakes by Vibration Compaction

Study of dehydration of organic sapropel by compression method

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