VERIFICATION OF FLOTATION KINETICS MODEL FOR TRIANGULAR DISTRIBUTION OF DENSITY FUNCTION OF FLOTABILITY OF COAL PARTICLES / WERYFIKACJA MODELU KINETYKI FLOTACJI DLA TRÓJKĄTNEGO ROZKŁADU FUNKCJI GĘSTOŚCI FLOTOWALNOŚCI ZIAREN WĘGLA

2013 ◽  
Vol 58 (4) ◽  
pp. 1279-1287 ◽  
Author(s):  
Krystian Kalinowski ◽  
Roman Kaula
Keyword(s):  
Density Function ◽  
Kinetics Model ◽  
Distribution Model ◽  
Triangular Distribution ◽  
Flotation Kinetics ◽  
Coal Flotation ◽  
Coefficient Distribution ◽  
Coal Particles ◽  
Supervisory Control System ◽  
Flotation Machines

Abstract Parameters of flotation kinetics model with a gamma and a triangular distribution have been determined based on the batch coal flotation experiments. Analyses were carried out at different values of the intensity of aeration air. The results of example analyses are presented in tables and graphs form. It follows from the carried out study on the mathematical models of flotability coefficient distribution of particles of examined coal samples that the triangular distribution model is statistical equivalent to the gamma flotability distribution. The assumption of the triangular distribution enables determination of the density function of distribution of fraction in the industrial flotation machines. Knowledge of this function will allow better evaluation of the phenomena occurring in the process of enrichment. It may be one of the basic information used in the supervisory control system.

scholarly journals Determination of Static Characteristics of Flow Flotation Machines Based on Experiments of the Kinetics of the Batch Coal Flotation

2016 ◽  
Vol 61 (1) ◽  
pp. 47-57
Author(s):  
Krystian Kalinowski ◽  
Roman Kaula
Keyword(s):  
Density Function ◽  
Ash Content ◽  
Static Characteristics ◽  
Flotation Process ◽  
Coal Flotation ◽  
Supervisory Control System ◽  
Enrichment Process ◽  
Flotation Machines ◽  
Kinetics Of

Abstract In the theory and a simulation technique of a coal flotation process a density function of a distribution of particles flotability is widely used. The characteristics of this type in the design of the flotation circuits as well as to optimize of the settings of the industrial flotation machines may be used. The density function of the distribution of the fraction f (k) based on the kinetics experiments to measure the recovery of material as a function of time in the laboratory flotation machines (in the batch coal flotation process) is determined. The problems of the determining of the flotability spectrum are relatively well resolved. An important problem is the determination of the concentrate quality. The concentrate quality directly depends on the ash content in the concentrate. In the paper a mathematical model of the separation of the mass of ash at the process of the kinetics of the batch flotation has been proposed. The research at different values of the air flow rate was carried out. The results of the analyses in tables and graphs are shown. The static characteristics of the single-cell of the flow flotation machine based on the characteristics of the distribution density of the fraction f (k) and the distribution of the ash content ak(k) were determined. Knowledge of these relationships will allow for a better assessment of the phenomena occurring in the enrichment process. This may be one of the basic information used in the supervisory control system of the flotation process.

Distributed flotation kinetics models – A new implementation approach for coal flotation

2014 ◽  
Vol 66-68 ◽  
pp. 77-83 ◽  
Author(s):  
Philip Ofori ◽  
Graham O’Brien ◽  
Priyanthi Hapugoda ◽  
Bruce Firth
Keyword(s):  
Flotation Kinetics ◽  
Kinetics Models ◽  
Coal Flotation ◽  
Implementation Approach

scholarly journals Effect of Hydrodynamic Cavitation Assistance on Different Stages of Coal Flotation

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 221
Author(s):  
Hua Han ◽  
An Liu ◽  
Huaifa Wang
Keyword(s):  
Contact Angle ◽  
Hydrodynamic Cavitation ◽  
Screening Tests ◽  
Separation Stage ◽  
Coal Flotation ◽  
Angle Measurements ◽  
Coal Particles ◽  
Constant Rate ◽  
Contact Angle Measurements ◽  
Flotation Performance

In this study, the effect of hydrodynamic cavitation (HC) on the conditioning stage (HCCS), separation stage (HCSS), and whole stage (HCWS) of coal flotation was investigated by flotation tests, laser granulometry, and contact angle measurements. The flotation results indicate that compared to conventional flotation, all HC-assisted flotation methods can improve concentrate combustible recovery and flotation constant rate. HCCS and HCSS show similar levels of improvement, while HCWS has a better flotation efficiency. The screening tests demonstrate that HC has the advantage of being able to liberate coarse coal particles (+0.25 mm) prior to being combined with gangues. On one hand, HC promotes the dispersion of both particles and agents, while longer cavitation time in HCCS does not lead to better flotation performance. On the other hand, enhancement of the adsorption of the collector on the surface of coal particles in HCCS is confirmed by flotation concentrate contact angle tests. However, HCSS leads to a decrease in concentrate hydrophobicity, compared to conventional flotation. The micro-nanobubbles generated by HC play an important role in improving flotation performance. HCWS offers the advantages of both HCCS and HCSS, and the cooperated mechanism of different HC modes enhances the recovery of coal particles in flotation.

scholarly journals Effect of Comminution Methods on Low-Rank Coal Bubble–Particle Attachment/Detachment: Implications for Flotation

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 452 ◽  
Author(s):  
Guoqiang Rong ◽  
Yangchao Xia ◽  
Youfei Zhang ◽  
Fangyu Guo ◽  
Dongyue Wang ◽  
...  
Keyword(s):  
Morphological Characteristics ◽  
Bubble Surface ◽  
Diameter Ratio ◽  
Low Rank ◽  
Low Rank Coal ◽  
Attachment Efficiency ◽  
Coal Flotation ◽  
Coal Particles ◽  
Wrap Angle ◽  
Particle Attachment

The floatability of fine low-rank coal particles can be greatly influenced by their morphological characteristics, such as shape and surface roughness. In this study, the attachment efficiency and detachment amplitude of fine low-rank coal particles produced by various comminution methods onto/from the bubble surface were investigated using homemade bubble–particle wrap angle and bubble–particle attachment/detachment testing systems. Results showed that the length–diameter ratio of rod-milled products was smaller than that of crushed products. The wrap angle of particles obtained by the crushed method was larger than that obtained by the rod-milled method, i.e., particles with greater length–diameter ratio showed higher attachment efficiency onto the bubble surface. Meanwhile, particles with greater length–diameter ratio exhibited a larger detachment amplitude, which suggests that it is more difficult to be detached from the bubble surface. However, rod-milled products showed lower attachment onto the bubble surface. The flotation test confirmed that the floatability ratio of crushed products was higher than that of rod-milled products, consistent with evidence from experimental analyses. This study provides a fundamental understanding of particle shapes for low-rank coal flotation by a novel research method combining the attachment efficiency and detachment amplitude of bubble–particle combinations.

The significance of positive and negative inertial forces in Particle-Bubble interaction and their role in the general flotation kinetics model

2021 ◽  
Vol 170 ◽  
pp. 107006
Author(s):  
Behzad Vaziri Hassas ◽  
Sabri Kouachi ◽  
Amir Eskanlou ◽  
Mustapha Bouhenguel ◽  
Mehmet S. Çelik ◽  
...  
Keyword(s):  
Kinetics Model ◽  
Inertial Forces ◽  
Flotation Kinetics ◽  
Bubble Interaction

Review on Upgradation in Coal Flotation by Pretreatments

2019 ◽  
pp. 57-64
Author(s):  
Saadat Ullah Khan Suri ◽  
Rafi Ullah Khan
Keyword(s):  
Research Study ◽  
Prime Factor ◽  
Film Coating ◽  
Ultra Sound ◽  
Coal Surface ◽  
Chemical Reagents ◽  
Coal Flotation ◽  
Precise Evaluation ◽  
Coal Particles ◽  
Sonic Treatment

Flotation of low ranked/oxidized coal becomes difficult with oily collectors. The prime factor parts accounted by lessening in coal hydrophobicity are the occurrence of polar hydrocarbons groups (hydroxyl, carbonyl, phenol and peroxides) on the coal surface. The up-gradation in coal flotation has been achieved due to the enhancement in hydrophobicity by pretreatments. The dry coal is conditioned with the pretreatment steps of grinding, mixing/conditioning, ultra sound, thermal treatment, microwave and direct mixing of the chemical reagents prior to wetting. These are the pretreatments methods among them grinding, mixing/conditioning are contemplated to separate the oxidized film coating on the coal particles surfaces. The separations of impurities are also indicated from ultra-sonic treatment. The Separation of pore/hydration water and hydroxyl functional groups through coal surface is accounted by microwave and thermal pretreatments. The procedure regarding direct contact produce the oxidize coal evaded for collector deposit on coal surface. The interception generally rises from hydration carapace on coal surface; in this duration, coal surface is wetted by water. The present research study is highlighted to see the distinct pretreatment steps effects on the rate of coal flotation. It is a welcome result declaration with highly precise evaluation.

Sign in / Sign up

Export Citation Format

Share Document