Surface Chemistry of Froth Flotation

Rao, S. Ramachandra

doi:10.1007/978-1-4757-4302-9

Cited by 87 publications

(76 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Segundo Quast (1999), a máxi-ma adsorção de ácido oleico sobre hematita ocorre no pH coincidente com o PIE (ponto isoelétrico) do mineral, sendo que, em pH's mais alcalinos, predomina a competição entre os íons oleato e hidroxil pelos sítios ativos presentes na superfície da hematita. Como depressor da ganga silicatada, Rao (2004) cita o silicato de sódio. As espécies altamente hidrofílicas formadas pela dissolução do silicato de sódio em água são responsá-veis pelo aumento da hidrofilicidade do mineral e, conseqüentemente, pela depressão da ganga silicatada.…”

Section: Introductionunclassified

Flotação direta de minério de ferro com oleato de sódio

Lopes

Lima

2009

Rem: Rev. Esc. Minas

View full text Add to dashboard Cite

(Iron ore direct flotation with sodium oleate) ResumoO objetivo desse trabalho foi estudar a possibilidade de concentração de minério de ferro por flotação direta, usando oleato de sódio como coletor dos minerais de ferro e o metassilicato de sódio como depressor da ganga silicosa. Após a caracterização das amostras minerais e do minério, foram feitos estudos fundamentais, que englobaram a determinação do potencial zeta dos minerais hematita e quartzo, cujos valores de PIE ocorreram em pH 7,5 e 1,8, respectivamente. Os ensaios de microflotação, em tubo de Hallimond modificado, determinaram as condições de maior flotabilidade da hematita, 50 mg/L de oleato de sódio em pH 7, e do quartzo, 70 mg/L de oleato de sódio em pH 9. Os ensaios de microflotação, ainda mostraram que o metassilicato de sódio foi mais efetivo na depressão da hematita que na depressão do quartzo. Os ensaios de flotação em bancada confirmaram esse comportamento, ou seja, o metassilicato de sódio não propicia separação seletiva entre a hematita e o quartzo durante a flotação. O melhor concentrado fornecido pela flotação direta da amostra de minério de ferro, cujos teores de Fe e SiO 2 eram, respectivamente, de 35,34 e 48,02%, foi obtido usando-se dosagens de 600 g/t de metassilicato de sódio e 1200 g/t de oleato de sódio: recuperação metalúrgica de Fe de 88%, teor de Fe de 58,1% e teor de SiO 2 de 14,4%. Palavras -chave:Flotação direta, minério de ferro, oleato de sódio, metassilicato de sódio. Abstract

show abstract

Section: Introductionunclassified

Flotação direta de minério de ferro com oleato de sódio

Lopes

Lima

2009

Rem: Rev. Esc. Minas

View full text Add to dashboard Cite

show abstract

“…As shown in Figure 1, There were two bands at 3851-3698 cm -1 with the peaks at 3738 and 3705 cm -1 which was signed to first functional group of the O-H stretch of hydroxyl groups [25,32,34]. As clearly shown in Figure 1 The same trend and even more contrast was shown by the second functional group of the C-H stretching of alkenes and alkanes with the weak bands at 3099-32845 cm -1 and the peaks at 3055 and 2951 cm -1 , respectively [25], [35]. It existed in the three samples whereas the 0.5 M KOH slightly increased alkenes and alkanes compounds in the LAFS-AC, as can be seen in Figure 1 mg/g at 40-min contact time, and it was 24.14 mg/g at 120-min contact time.…”

Section: Resultsmentioning

confidence: 84%

“…The overall effect of temperature on adsorption capacity can be also evaluated using Le Chatelier's principle to show chemical reaction taken place in a system [37,35] including adsorption process [38,39]. The activation energy (E) for chemical adsorption was determined using the linear plot slope of 1/T versus ln qe as given:…”

Section: Effect Of Koh Concentration On Adsorption Capacitymentioning

confidence: 99%

Adsorption of Cu(Ii) Ions in Aqueous Solution Onto Limonia Acidissima Shellbased Activated Carbon: Kinetic and Isotherm Studies

Muslim

Said

Hariati

et al. 2018

MST

View full text Add to dashboard Cite

Adsorption of Cu(II) ions from aqueous solution using activated carbon prepared from Limonia acidissima fruit shell (LAFS-AC) was conducted in batch mode experiments at pH 5 (±0.15), 100 rpm and 1 atm. The effects of contact time, initial Cu(II) ions concentration, KOH concentration, and adsorption temperature on Cu(II) ions adsorption capacity were investigated. Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy analyses were performed to investigate the active site and surface morphology of the LAFS-AC, respectively. The Cu(II) ions adsorption was fitted very well (R 2 = 0.94 on average) to the pseudo second-order adsorption kinetic with the adsorption capacity and rate being 25.58 mg/g and 0.07 g/mg.min, respectively at 27 o C by the LAFS AC activated using 0. Abstract Adsorpsi Ion Cu(Ii) di dalam Larutan Berair menggunakan Karbon Aktif Berbasis Kulit BuahLimonia acidissima: Studi Kinetika dan Isotermal. Adsorpsi ion Cu(II) dari larutan berair menggunakan karbon aktif yang dibuat dari kulit buah Limonia acidissima (LAFS-AC) dilakukan pada percobaan dengan sistem batch pada pH 5 (± 0,15), 100 rpm dan 1 atm. Efek waktu kontak, konsentrasi awal ion Cu(II), konsentrasi KOH, dan suhu adsorpsi pada adsorpsi ion Cu (II) diselidiki. Analisis spektroskopi FTIR dan SEM dilakukan untuk menyelidiki morfologi bagian aktif dan permukaan LAFS-AC. Adsorpsi ion Cu(II) memiliki kemiripan (R2 rata-rata = 0,94) terhadap kinetika adsorpsi pseudo orde kedua dengan kapasitas adsorpsi dan laju masing-masing 25,58 mg/g dan 0,07 g/mg.min pada suhu 27 o C pada LAFS-AC aktif menggunakan 0,5 M KOH. Pada suhu 60 o C, nilainya menjadi 26,88 mg/g dan 0,15 g/mg.min. Adsorbsi ion Cu(II) mengikuti model adsorpsi isotherm Langmuir (LAIM) (R2 = 0,98 rata-rata). Kapasitas adsorpsi LAIM dan konstanta masing-masing bernilai 26,67 mg/g dan 0,03 L/g pada suhu 27 o C. Pada suhu 60 o C, nilainya meningkat secara dramatis menjadi 0,09 L/g. Kondisi adsorpsi optimal yang diperoleh adalah 0,5 M KOH pada LAFS-AC aktif, konsentrasi awal Cu(II) 509,81 mg/L dan waktu kontak 120 menit pada suhu 60 o C dengan kapasitas adsorpsi ion Cu(II) sebesar 26,95 mg/g.

show abstract

“…Dimensionless number II is associated with the chemical characteristics of the flotation process and dimensionless number III considers the coal's characteristics by the relationship between floatable and nonfloatable fractions. Those dimensionless numbers were based according to the effect of chemical reagents dosage and solids concentration on the chemistry of froth flotation [31], the effect of the hydrophobicity of coal macerals [30], and the operating variables affecting the hydrodynamics of the process [32].…”

Section: Formulation Of the New Mathematical Model For Coal Flotationmentioning

confidence: 99%

“…Since chemical reagents dosage and the solids concentration affect the collision, attachment and stability processes between particles and bubbles which govern particle recovery [31], the relation of parameters in the dimensionless number II can be considered as the driving force of the overall flotation process. The Prandtl number provides a combination of properties of the fluid while the dimensionless number III is a combination of the properties of the coal defining its natural hydrophobicity or hydrophilicity [30].…”

Section: Formulation Of the New Mathematical Model For Coal Flotationmentioning

confidence: 99%

A new mathematical model for coal flotation kinetics

Guerrero¹,

Barraza-Burgos²

2017

DYNA

View full text Add to dashboard Cite

This study describes the development and formulation of a novel mathematical model for coal flotation kinetic. The flotation rate was considered as a function of chemical, operating and petrographic parameters for a global flotation order n. The equation for flotation rate was obtained by dimensional analysis using the Rayleigh method. It shows the dependency of flotation kinetic on operating parameters, such as air velocity and particle size; chemical parameters, such as reagents dosage and solids content; and mineral and maceral composition of coal. The flotation rate equation integrates the kinetic coefficient and the intrinsic characteristics of coal with dimensional consistency, and it is expressed by three dimensionless numbers which have physical chemical meaning. The model also exhibits similarities with traditional transport phenomena models represented by dimensionless numbers and predicts the flotation kinetic constant of a Colombian coal sample showing a good correlation between experimental and calculated values.Keywords: coal flotation; flotation rate; kinetic model. Un nuevo modelo matemático para la cinética de flotación de carbonesResumen Este estudio describe el desarrollo y formulación de un nuevo modelo matemático para la cinética de flotación de carbón. La velocidad de flotación se considera una función de parámetros químicos, operacionales y petrográficos para la flotación global de orden n. La ecuación de velocidad de flotación se obtuvo por análisis dimensional usando el método de Rayleigh. Este método muestra la dependencia de la cinética de flotación sobre los parámetros de operación tales como velocidad del aire y tamaño de partícula; parámetros químicos tales como dosis de reactivos y contenidos de sólidos; y composición mineral y maceral del carbón. La ecuación de velocidad de flotación integra el coeficiente cinético y las características intrínsecas del carbón con consistencia dimensional, y se expresa por tres números adimensionales que tienen significado químico físico. El modelo también muestra similitudes con los modelos tradicionales de fenómenos de transporte representados por números adimensionales y predice la constante cinética de flotación de un carbón Colombiano mostrando buena correlación entre los valores experimentales y calculados.Palabras clave: flotación de carbón; tasa de flotación; modelo cinético.

show abstract

Surface Chemistry of Froth Flotation

Cited by 87 publications

References 93 publications

Flotação direta de minério de ferro com oleato de sódio

Flotação direta de minério de ferro com oleato de sódio

Adsorption of Cu(Ii) Ions in Aqueous Solution Onto Limonia Acidissima Shellbased Activated Carbon: Kinetic and Isotherm Studies

A new mathematical model for coal flotation kinetics

Contact Info

Product

Resources

About