Adsorbing colloidal flotation removing metals ions in a modified jet cell

Santander, M.; Valderrama, L.; Guevara, Mónica; Rubio, J.

doi:10.1016/j.mineng.2011.04.028

Cited by 17 publications

(7 citation statements)

References 20 publications

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“…The minerals processing involve the use of large amounts of water which generates contaminated effluents (Santander et al, 2011). The pollutants associated with these effluents can include toxic ions, such as arsenic (Rubio, 1998).…”

Section: Introduction 1 23mentioning

confidence: 99%

Dissolved Air Flotation of arsenic adsorbent particles

Santander

Valderrama

2015

ing.inv.

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The removal of arsenic from synthetic effluent was studied using the adsorbent particle flotation technique (APF) and dissolved air flotation (DAF). A sample of an iron mineral was used as adsorbent particles of arsenic, ferric chloride as coagulant, cationic polyacrylamide (NALCO 9808) as flocculants, and sodium oleate as collector. Adsorption studies to determine the pH influence, contact time, and adsorbent particles concentration on the adsorption of arsenic were carried out along with flotation studies to determine the removal efficiency of adsorbents particles. The results achieved indicate that the adsorption kinetic of arsenic is very rapid and that in range of pH's from 2 to 7 the adsorption percentages remain constant. The equilibrium conditions were achieved in 60 minutes and about 95% of arsenic was adsorbed when used an adsorbent concentration of 2 g/L and pH 6.3. The maximum adsorption capacity of adsorbent particles was 4.96 mg/g. The mean free energy of adsorption (E) was found to be 2.63 kJ/mol, which suggests physisorption. The results of the flotation studies demonstrated that when synthetic effluents with 8.9 mg/L of arsenic were treated under the following experimental conditions; 2 g/L of adsorbent particles, 120 mg/L of Fe(III), 2 mg/L of Nalco 9808, 20 mg/L of sodium oleate, and 40% of recycle ratio in the DAF, it was possible to reach 98% of arsenic removal and 6.3 NTU of residual turbidity in clarified synthetic effluent.Keywords: Adsorption particles flotation, arsenic removal, Dissolved Air Flotation. RESUMENLa remoción de arsénico desde un efluente sintético fue estudiada usando la técnica de flotación de partículas adsorbentes (FPA) y flotación por aire disuelto (FAD). Una muestra de mineral de hierro fue utilizada como partículas adsorbentes de arsénico, cloruro férrico como coagulante, poliacrilamida catiónica (NALCO 9808) como floculante y oleato de sodio como colector. Fueron realizados estudios de adsorción para determinar la influencia del pH, tiempo de contacto y concentración de partículas adsorbentes sobre el porcentaje de adsorción de arsénico y estudios de flotación para determinar la eficiencia de remoción de las partículas adsorbentes. Los resultados alcanzados indican que la cinética de adsorción de arsénico es muy rápida y que en el rango de pH's desde 2 a 7 el porcentaje adsorción permanece constante. Las condiciones de equilibrio fueron alcanzadas en 60 minutos y alrededor de 95% del arsénico fue adsorbido cuando fue utilizada una concentración de partículas adsorbente de 2 g/L y pH 6,3. La máxima capacidad de adsorción de las partículas adsorbentes fue 4,96 mg/g. La energía media de adsorción (E) fue 2,63 kJ/mol lo cual sugiere que el mecanismo de adsorción es fisisorción. Los resultados de los estudios de flotación demuestran que cuando fueron tratado efluentes sintéticos con 8,9 mg/L de arsénico bajo las siguientes condiciones experimentales, 2 g/L de partículas adsorbentes, 120 mg/L de Fe(III), 2 mg/L de Nalco 9808, 20 mg/L de oleato de sodio y 40% de re...

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Section: Introduction 1 23mentioning

confidence: 99%

Dissolved Air Flotation of arsenic adsorbent particles

Santander

Valderrama

2015

ing.inv.

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“…Ion removal by flotation can take place: (1) through an electrical interaction between the polar part of the molecule of the collector and the contaminating species, forming a sublet that is transported to the surface by air bubbles introduced into the column; (2) through the formation of a precipitate, in the form of hydroxide or sulphate (Capponi et al, 2006) or 3by absorbent particles used as a carrier agent (Sabti et al, 2002;Santander et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Iron removal by precipitate flotation

Morosini¹,

Baltar

Duarte-Coelho

2014

Rem: Rev. Esc. Minas

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The water from several artesian wells in the metropolitan area of Recife presents high iron content, preventing its use in some industrial processes. The possibility of removing the iron by the use of precipitate flotation using sodium dodecyl sulphate (SDS) as collector was studied. The tests were carried out in a glass column 65 cm high, fed by a constant airflow. At pH 8, where the isoelectric point of colloidal iron hydroxide [Fe(OH)3] was observed, the size of the precipitate increases with conditioning time and facilitates the removal of iron ions by flotation. The results showed that an increase in conditioning time, from 5 to 20 minutes, resulted in a reduction of the residual concentration of iron from 13.2 to 0.2 ppm. The decrease in precipitate specific surface area rendered a decrease in the collector consumption possible. The iron ion removal process by flotation using SDS as collector was shown to be quite efficient. A removal of 99% of Fe3+ contained in the original solution was obtained.

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“…Among the targets to be treated are surfactants [11][12][13][14][15][16][17][18][19][20][21], proteins [22][23][24][25][26][27][28], microorganisms including bacteria and viruses [29,30], dyes [9,31], other organic substances including plastics [7,[32][33][34][35], ores [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55], metal ions , colloidal particles [106][107][108] in pretreatment in mining and for analytical chemistry, or in the emission co...…”

Section: Introductionmentioning

confidence: 99%

“…In industrial applications, foam or bubbles are typically produced by three techniques; induced air flotation (IAF) [8,46,48], dissolved air flotation (DAF) [8, 46 48, 57, 72] and jet cell flotation (JCF) [8,46,108]. IAF utilizes a mechanical force to form bubbles with a combination of a high-speed agitator and an air injector.…”

Section: Introductionmentioning

confidence: 99%

Foam Separation of Metal Ions and the Potential ‘Green’ Alternative to Solvent Extraction

Kinoshita

Nii

2012

SERDJ

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Foam separation has been applied to recover or remove various substances from dilute aqueous solutions in various industries because it is an environment-and cost-friendly process. The literature has been reviewed focusing on the separation of metal ions.From an operational point of view, various methods are discussed for the removal of metal ions from solution, and on the selective recovery of a specific target metal ion.The former applications are designed to purify industrial effluents, and the performance of foam separation is well proven. The latter examples are aimed at recovering valuable metals, which has been shown to be difficult due to the inherent problem of contamination in foam separation. An operation mode was developed to overcome this problem and to enhance the selectivity for separating a specific target metal from solutions containing multi-metals. The method, called continuous counter-current foam separation, was developed, and its performance was demonstrated by the experimental results for Ga(III) separation. Since both high selectivity and recovery was obtained by this method, foam separation is potentially a "solvent-free" alternative to solvent extraction.

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Adsorbing colloidal flotation removing metals ions in a modified jet cell

Cited by 17 publications

References 20 publications

Dissolved Air Flotation of arsenic adsorbent particles

Dissolved Air Flotation of arsenic adsorbent particles

Iron removal by precipitate flotation

Foam Separation of Metal Ions and the Potential ‘Green’ Alternative to Solvent Extraction

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