Effect of flotation reagent adsorption by different ultra-fine coal particles on coal flotation

Peng, Yaoli; Liang, Long; Tan, Jiakun; Sha, Jiahao; Xie, Guangyuan

doi:10.1016/j.minpro.2014.12.005

Cited by 40 publications

(13 citation statements)

References 29 publications

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“…Separation by flotation is a complex three-phase process (liquid, solid and air phases) with many sub-processes and interactions. Flotation of coal samples is controlled by many factors that divided into three parts: coal, chemistry and machine (Wills 2006;Huynh et al 2011;Liang et al 2015;Peng et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Modeling of fine coal flotation separation based on particle characteristics and hydrodynamic conditions

Shahbazi

Chelgani

2016

Int J Coal Sci Technol

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Flotation is a complex multifaceted process that is widely used for the separation of finely ground minerals. The theory of froth flotation is complex and is not completely understood. This fact has been brought many monitoring challenges in a coal processing plant. To solve those challenges, it is important to understand the effect of different parameters on the fine particle separation, and control flotation performance for a particular system. This study is going to indicate the effect of various parameters (particle characteristics and hydrodynamic conditions) on coal flotation responses (flotation rate constant and recovery) by different modeling techniques. A comprehensive coal flotation database was prepared for the statistical and soft computing methods. Statistical factors were used for variable selections. Results were in a good agreement with recent theoretical flotation investigations. Computational models accurately can estimate flotation rate constant and coal recovery (correlation coefficient 0.85, and 0.99, respectively). According to the results, it can be concluded that the soft computing models can overcome the complexity of process and be used as an expert system to control, and optimize parameters of coal flotation process.

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Section: Introductionmentioning

confidence: 99%

Modeling of fine coal flotation separation based on particle characteristics and hydrodynamic conditions

Shahbazi

Chelgani

2016

Int J Coal Sci Technol

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“…A baixa recuperação na flotação de partículas finas e ultrafinas é provocada por diversos fatores, dentre eles, a baixa probabilidade de colisão e adesão bolha-partícula, a dificuldade de superar a barreira energética (arraste mecânico -entrainment e entrapment), a elevada adsorção de reagentes, a baixa seletividade, a oxidação superficial e as alterações mineralógicas (Trahar e Warren, 1976;Weber e Paddock, 1983;Trahar, 1981;Schulze et al, 1989;Yoon, 2000;Rubio et al, 2004;Waters et al, 2008;Shahbazi et al, 2010;Peng et al, 2015). Pease et al (2006) O tamanho de bolha é outra variável que influência na eficiência do processo de flotação.…”

Section: Gram-positiva (A C); Gram-negativa (B D) (Adaptado Deunclassified

“…A baixa recuperação na flotação de partículas finas e ultrafinas é provocada pela baixa probabilidade de colisão e adesão bolha-partícula, dificuldade de superar a barreira energética entre elas, arraste mecânico (entrainment e entrapment), recobrimento por lamas (slimes coating), elevada adsorção de reagentes, baixa seletividade, alta área superficial por unidade de massa, baixa cinética de flotação, oxidação superficial e alterações mineralógicas (Trahar e Warren, 1976;Weber e Paddock, 1983;Trahar, 1981;Schulze et al, 1989;Yoon, 2000;Pease et al,2006;Waters, 2008;Shahbazi et al, 2010;Peng et al, 2015). Diferentes autores ao abordar a influência do tamanho de partícula na flotação, normalmente, definem o que é partícula fina ou grossa de forma indistinta, nesse sentido é importante ter cuidado quando se fala de finos e grossos.…”

Section: Influência Do Tamanho De Partícula Na Flotaçãounclassified

“…Dubel et al (1992) superficial das partículas, partículas finas têm uma maior área superficial em comparação às partículas intermediarias e grosseiras (Trahar, 1981;Yoon, 2000;Rubio et al, 2004;Pease et al, 2006;Shahbazi et al, 2010;Peng et al, 2015). …”

Section: Arraste Mecânicounclassified

“…A densidade de corrente é um fator importante que influencia na taxa de produção e diâmetro de bolhas no processo de eletroflotação (Gupta e Ali, 2012;ketkar et al, 1991;Sarkar et al, 2011;Jiménez et al, 2016 aumento da área superficial das partículas de hematita (Shahbazi et al, 2010;Peng et al, 2015). Outro fator que pode estar relacionado ao incremento da recuperação é o aumento da colisão das partículas hidrofobizadas.…”

Section: Efeito Da Densidade De Correnteunclassified

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Eletroflotação De Partículas Finas De Hematita Em Célula Modificada De Partridge Smith Usando Rhodococcus Opacus Como Biorreagente

HACHA¹

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Eletroflotação de partículas finas de hematita em célula modificada de Partridge Smith usandoRhodococcus opacus como biorreagente This work aims to evaluate the electroflotation of hematite fine particles in a modified Partridge Smith cell using Rhodococcus opacus. A hematite sample with grade 96% was used in this study; additionally, three granulometric fractions were selected: -53+38; -38+20 and -20 micrometers. The variables studied were pH, reagent concentration and current density. Zeta potential measurements and analysis by infrared spectroscopy were carried out to assess the interaction before and after reagents interaction. In order to gain a better understanding of the bubble diameter influence in the process, measurements of the diameter of hydrogen and oxygen bubbles were done. The average bubble diameter (d 32 ) was found in the range of 40 to 60 micrometers for the hydrogen bubbles and of 50 to 70 micrometers for the oxygen bubbles. Finally, electrocoagulation assays the hematite with R. opacus and sodium oleate were carried out. The reduction in particle size favored the floatability of hematite; this fact can be related to the bubble size generated in the process and the ability of R. opacus to form floccules through the interaction of Van der Waals. On the other hand, the increase of reagent concentration (R. opacus and sodium oleate) favored the floatability of hematite. Suitable pH values for hematite flotation were found around 6 and 7 for R. opacus and sodium oleate, respectively. Maximum hematite floatability with R. opacus using hydrogen bubbles was around 80% and around 65% with oxygen bubbles. Sodium oleate presented a better performance reaching a maximum floatability of approximately 98% for hydrogen bubbles and around 90% for oxygen bubbles. The characteristics of the bacterial surface and the bubble size were determinant factors in the hematite floatability. Therefore, the electroflotation process using R. opacus as collector is a potential technology regarding environmental issues found with the synthetic reagents.

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Study of a foam flotation process assisted by cationic surfactant for the separation of soil clay particles: processing parameters and scaling-up sensitivity

Said

Frances

Grandjean

et al. 2019

Chemical Engineering and Processing - Process Intensification

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In a radioactively contaminated soil, cesium 137 is known to be uptaken by fine particles, preferentially by micrometric phyllosilicate particles. Cesium is almost irreversibly adsorbed on the planar and frayed edge sites of the phyllosilicates. Particulate froth flotation technology assisted by cationic surfactant and operating in continuous mode is studied as a possible method to selectively separate fine phyllosilicate particles from soil. As a first approach, the strategy was to investigate the potentiality of this modular technology to separate fine phyllosilicates from non contaminated soils. Several soils, exhibiting various physicochemical properties were floated and compared. The objective was to disclose and understand the influence of soil textural and physicochemical properties on the separation of fine phyllosilicate particles. Comparison between soils flotabilities indicated that the separation yield and the selectivity on fine particles are strongly related to the initial soil properties. Systematic studies of the sizeparticle distribution of the separated particles showed that fine phyllosilicate particles (<50 µm) removal from soil is possible. Three main size classes are detected in the separated samples: the first one is centered on 3 µm and could be attributed to the phyllosilicates class; the second one is centered on 10 µm and could be a phyllosilicate aggregates class; the last one, on 30-50 µm (depending on soil properties and flotation conditions), could be composed of phyllosilicate aggregates and/or silica aggregates classes. Finally, the mineralogical composition of the separated particles from the various soils were identified by using X-Ray Diffraction analysis.

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Effect of flotation reagent adsorption by different ultra-fine coal particles on coal flotation

Cited by 40 publications

References 29 publications

Modeling of fine coal flotation separation based on particle characteristics and hydrodynamic conditions

Modeling of fine coal flotation separation based on particle characteristics and hydrodynamic conditions

Eletroflotação De Partículas Finas De Hematita Em Célula Modificada De Partridge Smith Usando Rhodococcus Opacus Como Biorreagente

Study of a foam flotation process assisted by cationic surfactant for the separation of soil clay particles: processing parameters and scaling-up sensitivity

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