Study of Filtration/Liquefaction of Calcium Carbonate Dispersions

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

doi:10.1205/026387604772803115

Cited by 2 publications

(5 citation statements)

References 6 publications

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“…8). The optimal doses of the dispersant were also found earlier for the dead-end and crossflow filtrations of the same CaCO 3 suspension [16,20]. …”

Section: Time Of Dispersant Additionsupporting

confidence: 68%

“…De- Table 1. Viscosity and dryness of the final suspension, and filtration efficiency at dynamic filtration (this work), crossflow filtration [20], and dead end filtration [16]. …”

Section: Discussionmentioning

confidence: 99%

“…5). Dispersant introduction into CaCO 3 suspension may result in deflocculation of the loose flocks followed by stabilization and formation of a more compact structure with higher resistance to flow [16,20].…”

Section: Influence Of Dispersant On the Cake Resistancementioning

confidence: 99%

“…1 compares viscosity and dryness of the final suspension and efficiency of dewatering for dynamic filtration (this work), crossflow filtration [20], and dead-end filtration [16] techniques using CaCO 3 of the same quality and the same dispersant. According to [20], the process efficiency was estimated as the final mass of the concentrated suspension obtained from the unit membrane surface during the unit time of dehydration (kg m -2 s -1…”

Section: Viscosity Of the Final Suspensionsmentioning

confidence: 99%

“…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%

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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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“…8). The optimal doses of the dispersant were also found earlier for the dead-end and crossflow filtrations of the same CaCO 3 suspension [16,20]. …”

Section: Time Of Dispersant Additionsupporting

confidence: 68%

“…De- Table 1. Viscosity and dryness of the final suspension, and filtration efficiency at dynamic filtration (this work), crossflow filtration [20], and dead end filtration [16]. …”

Section: Discussionmentioning

confidence: 99%

Section: Influence Of Dispersant On the Cake Resistancementioning

confidence: 99%

Section: Viscosity Of the Final Suspensionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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Estimation of floc size in highly concentrated calcium carbonate suspension obtained by filtration with dispersant

Soua

Larue

Vorobiev

et al. 2006

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Study of Filtration/Liquefaction of Calcium Carbonate Dispersions

Cited by 2 publications

References 6 publications

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

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

Estimation of floc size in highly concentrated calcium carbonate suspension obtained by filtration with dispersant

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Study of Filtration/Liquefaction of Calcium Carbonate Dispersions

Cited by 2 publications

References 6 publications

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

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

Estimation of floc size in highly concentrated calcium carbonate suspension obtained by filtration with dispersant

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

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