Simulation of surfactant contribution to ink removal selectivity in flotation deinking lines

Beneventi, Davide; Allix, J.; Zeno, Elisa; Nortier, Patrice; Carré, Bruno

doi:10.1016/j.seppur.2008.10.033

Cited by 14 publications

(9 citation statements)

References 36 publications

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“…With the industrial paper furnish, containing more ink, IR values are better and in agreement with the literature, i.e., higher than 80% (Beneventi et al 2007;Beneventi et al 2009a;Saint Amand 1999). Ozone-based flotation led to an IR increase of 2.6 and 8.2 points for offset print and NP/MG respectively.…”

Section: Comparison Of the O 3 /O 2 Flotation Performances On Two Papsupporting

confidence: 86%

“…With an industrial paper furnish, a conventional ink removal was observed at the end of the flotation (higher than 80%) (Beneventi et al 2009a;Dorris et al 2011;Saint Amand 1999). Figure 2 also shows that for both paper furnishes the use of ozone slightly increased ink removal.…”

Section: Comparison Of Air and Ozone Flotation -Kinetic Studymentioning

confidence: 91%

“…Moreover the industrial paper furnish (NP/MG furnish) generated 3.8 to 4.8 times more losses than the offset print. The explanations are: (i) the industrial paper furnish, containing more ink particles, was better deinked, as explained before, thus generating more rejects and (ii) the paper furnish certainly released extra surfactants which modified the froth stability and thus increased losses (Beneventi et al 2009a;Carré et al 2001). However ozone, added in the gas stream for the flotation of the NP/MG, still improved the flotation efficiency since losses were decreased and ink removal improved.…”

Section: Comparison Of the O 3 /O 2 Flotation Performances On Two Papmentioning

confidence: 93%

See 2 more Smart Citations

Innovative Ozone/Oxygen Reactive Flotation for Paper Deinking

Marlin

Almeida

Aurousseau

et al. 2013

Ozone: Science & Engineering

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To improve paper recycling, the potential of an innovative deinking process using a reactive ozone/oxygen gas mixture instead of air was studied on two recovered paper furnishes (offset print and newsprint/magazine mixture). Using suitable O 3 concentrations, ink removal, following first-order kinetics, increased and losses dropped leading to better selectivity than using air alone. The ozone benefits in term of selectivity depended on temperature and paper furnishes and reached 100% for newsprint/magazine furnish at ambient temperature. Finally deinking effluent COD was significantly reduced and the ozone-based flotation allowed the reduction of the alkaline chemistry used before flotation.

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Section: Comparison Of the O 3 /O 2 Flotation Performances On Two Papsupporting

confidence: 86%

Section: Comparison Of Air and Ozone Flotation -Kinetic Studymentioning

confidence: 91%

Section: Comparison Of the O 3 /O 2 Flotation Performances On Two Papmentioning

confidence: 93%

See 1 more Smart Citation

Innovative Ozone/Oxygen Reactive Flotation for Paper Deinking

Marlin

Almeida

Aurousseau

et al. 2013

Ozone: Science & Engineering

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“…Flotation is a separation technology taking place in aqueous media, whose success relies on regulating the wanted mineral surfaces hydrophobic using collectors and the unwanted mineral surfaces hydrophilic using inhibitors [36][37][38]. In flotation, cassiterite particles are firstly dispersed in water.…”

Section: Adsorption Energy Comparisonmentioning

confidence: 99%

New Insights into the Adsorption of Oleate on Cassiterite: A DFT Study

et al. 2017

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Abstract:A new understanding of the adsorption mechanism of oleate on cassiterite surfaces is presented by density functional theory (DFT) calculations. Various convergence tests were conducted to optimize the parameter settings for the rational simulation of cassiterite bulk unit cell and surface slabs. The calculated surface energies of four low-index cassiterite cleavage planes form an increasing sequence of (110) < (100) < (101) < (001), demonstrating (110) is the most thermodynamically stable surface of cassiterite. The interaction strengths of the oleate ion (OL − ), OH − , and H 2 O on the SnO 2 (110) face are in the order of H 2 O < OH − < OL − , which reveals that the OL − is able to replace the adsorbed H 2 O and OH − on the mineral surfaces. Mulliken population calculations and electron density difference analysis show that electrons transfer from the Sn atoms on the cassiterite (110) surface to the O atoms offered by carboxyl groups of oleate during the interaction. The populations of newly formed O1-Sn1 and O2-Sn2 bonds are 0.30 and 0.29, respectively, indicating that these two bonds are of a very low covalency. Density of states analysis reveals that the formation of an O1-Sn1 bond mainly results from the 5s and 5p orbitals of the Sn1 atom and the 2p orbital of the O1 atom.

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“…Particle and water transport during flotation deinking were simulated using semiempirical equations proposed and validated in previous works. ,, The flotation process is described in terms of flotation, entrainment, frothing, and water/particle drainage in the froth. Transport coefficients to run simulations were obtained for a model pulp by fitting previously obtained laboratory data with transport equations, accounting for chemical effects induced by changes in surfactant concentration.…”

Section: Simulation Of the Flotation Deinking Processmentioning

confidence: 99%

Optimization and Management of Flotation Deinking Banks by Process Simulation

Beneventi

Zeno

Nortier

et al. 2009

Ind. Eng. Chem. Res.

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In this work, the contribution of flotation deinking banks design on ink removal efficiency, selectivity, and specific energy consumption was simulated using a semiempirical approach. Single-stage with mixed tank/column cells, two-stage, and three-stage configurations were evaluated, and the total number of flotation units in each stage and their interconnection were used as main variables. Explicit correlations between ink removal efficiency, selectivity, energy consumption, and line design were developed for each configuration. When considering a conventional two-stage configuration as reference, a decrease in the specific energy consumption for constant ink removal efficiency and selectivity was obtained with the single-stage bank with a stack of flotation columns at the front of the line, whereas an increase in ink removal selectivity for constant ink removal efficiency and specific energy consumption was obtained with the three-stage bank. The present results show that the performance of conventional flotation deinking banks can be improved by optimizing process design and implementing mixed tank/column technologies in the same deinking line.

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Simulation of surfactant contribution to ink removal selectivity in flotation deinking lines

Cited by 14 publications

References 36 publications

Innovative Ozone/Oxygen Reactive Flotation for Paper Deinking

Innovative Ozone/Oxygen Reactive Flotation for Paper Deinking

New Insights into the Adsorption of Oleate on Cassiterite: A DFT Study

Optimization and Management of Flotation Deinking Banks by Process Simulation

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