Precoat filtration of a deflocculated mineral suspension in the presence of a dispersant

Vorobiev, Eugène; Mouroko-Mitoulou, Thomas; Soua, Zied

doi:10.1016/j.colsurfa.2004.07.020

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…The slight reduction in viscosity enables the highly concentrated coating colors to be used with great energy saving by easing the mixing process [39]. Ammonium polycarbonate [40] and polyacrylates [41] are examples of dispersants commonly used for stabilizing calcium carbonate suspensions. Polyphosphates and lignosulfonates silicates are also used in coating solutions.…”

Section: Dispersantmentioning

confidence: 99%

A review on cationic starch and nanocellulose as paper coating components

Sharma

Aguado

Murtinho

et al. 2020

International Journal of Biological Macromolecules

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Section: Dispersantmentioning

confidence: 99%

A review on cationic starch and nanocellulose as paper coating components

Sharma

Aguado

Murtinho

et al. 2020

International Journal of Biological Macromolecules

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“…For d-dewatering, dispersant addition to concentrated dispersions resulted in a higher adsorption value, A. The differences in adsorption behavior observed in i-dewatering and d-dewatering experiments possibly reflect the effect of suspension concentration on the mechanism of adsorption of the macromolecules on CaCO 3 surface [35] and extra retention of the dispersant molecules by the filter cake in d-dewatering experiments [17]. , respectively.…”

Section: Dispersant Lossesmentioning

confidence: 88%

“…Different methods for preparation of highly loaded CaCO 3 suspensions, based on powder rehydration in the presence of a dispersant , containing up to 74 wt % CaCO 3 in the presence of 0.5 wt % sodium polyacrylate [16,17]. However, a supplementary stage of mechanical cake homogenization is required for cake fluidization and high dryness can be achieved after CaCO 3 cake compression at 10-15 bars.…”

Section: Introductionmentioning

confidence: 99%

Dead‐End Dynamic Filtration of Highly Concentrated CaCO₃ Suspensions in the Presence of a Dispersant

et al. 2010

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This work discusses dewatering of CaCO 3 suspensions in the presence of a dispersant (sodium polyacrylate). Suspensions were dewatered using the rotating diskaided dead-end dynamic filtration technique. Dewatering efficiency was studied as a function of the dispersant content and operational parameters (disk rotation speed, filtration pressure). Two dewatering modes, with initial (i-dewatering) and delayed (d-dewatering) dispersant addition, were tested. For concentrated suspensions, the d-dewatering allowed higher final dryness and better fluidity than i-dewatering with minimum dispersant losses in the filtrate. IntroductionMineral suspensions with a high concentration of particles and low viscosity are required for many practical applications, such as ceramic processing and preparation of paints, or paper coatings [1,2]. However, viscosity is generally high with concentrated mineral suspensions due to their aggregation and formation of spatial networks [3,4]. One effective way of fluidity regulation is based on the addition of suitable dispersants [5].The highly concentrated (72-75 wt %) and low-viscosity suspensions of calcium carbonate (CaCO 3 ) are required for improvement of paper whiteness, gloss, and printability. The sodium and ammonium salts of polyacrylic acid were found to be effective dispersants for CaCO 3 suspensions [6,7].Different methods for preparation of highly loaded CaCO 3 suspensions, based on powder rehydration in the presence of a dispersant , containing up to 74 wt % CaCO 3 in the presence of 0.5 wt % sodium polyacrylate [16,17]. However, a supplementary stage of mechanical cake homogenization is required for cake fluidization and high dryness can be achieved after CaCO 3 cake compression at 10-15 bars. The dead-end filtration technique always results in growth of the filter cake in low filtration efficiency and it requires supplementary mechanical agitation for filter cake fluidization. To avoid these limitations, different continuous microfiltration techniques with shear flow were tested [18,19,[20][21][22][23][24].The filtration flux in a rotating disk system is governed by different operational parameters, such as filtration pressure, rotation speed, concentration of feed suspension, as well as the design of the filtration module. The moment of dispersant addition in the course of filtration may also be an important factor influencing the dryness and fluidity of the final suspension and filtrate contamination by the dispersant. Then, it requires further investigation.This work is devoted to the study of dewatering of CaCO 3 suspensions using a lab-scale dynamic filtration module. The cylindrical filter cell comprised a rotating disk with adjustable speed and filtration was carried out on a fixed microfiltration membrane. The time of dispersant (sodium polyacrylate) addition and operational parameters (disk rotation speed, filtration pressure) were analyzed. Materials and Methods MaterialsThe aqueous suspension of calcium carbonate with an initial solid content of 20.0 wt % was provi...

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“…Preliminary experiments (Dusanter et al, 2006) were carried out to assess the influence of shearing time on stress σ of dispersed CaCO3 suspensions containing 1% of dispersant (CaCO3 content varied from 30 to 70%). The shear thinning behaviour indicated a linear behaviour up to a critical rate and was associated to a Bingham behaviour fluid, showing that a minimum stress is necessary to break the residual agglomerates in the suspension (Vorobiev et al, 2004).…”

Section: Characterization Of Initial Calcium Carbonate Suspensionsmentioning

confidence: 99%

Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed

Dusanter

Saleh

Guigon

2008

KONA

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Precoat filtration of a deflocculated mineral suspension in the presence of a dispersant

Cited by 8 publications

References 5 publications

A review on cationic starch and nanocellulose as paper coating components

A review on cationic starch and nanocellulose as paper coating components

Dead‐End Dynamic Filtration of Highly Concentrated CaCO₃ Suspensions in the Presence of a Dispersant

Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed

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Precoat filtration of a deflocculated mineral suspension in the presence of a dispersant

Cited by 8 publications

References 5 publications

A review on cationic starch and nanocellulose as paper coating components

A review on cationic starch and nanocellulose as paper coating components

Dead‐End Dynamic Filtration of Highly Concentrated CaCO3 Suspensions in the Presence of a Dispersant

Formulation of Highly Concentrated Suspensions for Spray Drying in a Fluidized Bed

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Dead‐End Dynamic Filtration of Highly Concentrated CaCO₃ Suspensions in the Presence of a Dispersant