Separating unburned carbon UC from coal fly ash CFA via froth flotation may be quantitatively characterized by the bubble particle attachment angle BPAA susceptible to operational factors
The unburned carbon in fly ash inhibits the performance of concrete A device using the flotation method to remove unburned carbon in fly ash was developed and the operating condition of the device was experimentally examined According to the results the device was able to remove unburnt carbon from fly ash by using the installed micro bubble
Separating unburned carbon UC from coal fly ash CFA via froth flotation may be quantitatively characterized by the bubble particle attachment angle BPAA susceptible to operational factors
In this paper prospective conditioning flotation tests were conducted to study the process intensification for the froth flotation of coal fly ash The interaction behavior of preconditioning on the separation of unburned carbon was investigated by conducting flotation tests Six flotation kinetic models were used to fit the flotation kinetic
Separating unburned carbon UC from coal fly ash CFA via froth flotation may be quantitatively characterized by the bubble particle attachment angle BPAA susceptible to operational factors
Separating unburned carbon UC from coal fly ash CFA via froth flotation may be quantitatively characterized by the bubble particle attachment angle BPAA susceptible to operational factors This study established a novel experimental system to directly observe attachment behaviors between irregularly shaped UCs and a stationary air bubble
A ball milling pretreatment with additives for fly ash and the combined use of reagents as flotation collectors in fly ash flotation were investigated for the removal of carbon and dioxins from municipal solid waste incineration fly ash The results indicated that ball milling pretreatment played an important role in the degradation of dioxins and the liberation of carbon
In this study froth flotation was successful in concentrating rare earth minerals existing in a thickener underflow material derived from Fire Clay seam coal that contained around 431 ppm of
ABSTRACT Unburned carbon UC in coal fly ash indicates the waste of energy source and is an obstacle to the utilization of coal fly ash The purpose of this study was to investigate the flotation kinetics of the removal of UC from coal fly ash The collector and frother dosage are key factors for coal fly ash flotation Six flotation kinetic models were applied to fit
The presence of unburned carbon in fly ash resulting from combustion process inefficiencies hinders its potential use in cement concrete activated carbon adsorbents and catalyst supports [2 [4] [5] [6]] fly ash can be reused as raw materials in the concrete stringent standards for unburned carbon content in recycled fly ash pose a
Changes to fly ash hydraulic disposal systems from lean 5% 10% solids to water to dense systems 60% 70% solids to water has resulted in insufficient water to allow flotation of cenospheres
The separation of carbon from fly ash significantly improves the potential end us of combustion byproducts Froth flotation is the most effective separation technique for ultrafine material
1 Introduction Coal fly ash CFA is among the greatest sources of fuel waste residues with the coal industry worldwide producing approximately 750 million tons annually 1 However the real amount of CFA reused is still less than the amount created with a utilization ratio of just 30% 2 The unburned carbon percentage of CFA has generally ranged between 2
The concurrent flotation column is a combination of a static mixer a froth separator for fly ash cleaning and a bubble generator to aid bubble formation The objective was to improve throughput and to reduce energy and operation costs of unburned carbon removal by accelerating flotation kinetics rate and increasing the process efficiency
The combination of froth flotation and hydraulic classification can facilitate the production of a high quality pozzolan that meets or exceeds ASTM specifications This combination has been rigorously evaluated and results of pilot scale testing are presented Pilot scale testing was conducted on fly ash from two active electric utility storage ponds The tests
Fly ash are the major by products which generated at 1200 1700 °C during the combustion of coal in thermal power plants [3] [4] whose multicomponent properties could be a double edged sword if not utilize properly [15] [16] Froth flotation which utilizes the hydrophobic difference of UC and other silico aluminate minerals is
1 Introduction Coal fly ash CFA is among the greatest sources of fuel waste residues with the coal industry worldwide producing approximately 750 million tons annually 1 However the real amount of CFA reused is still less than the amount created with a utilization ratio of just 30% 2 The unburned carbon percentage of CFA has generally ranged between 2
Coal fly ash the main industrial waste in coal fired power plants generated during the coal combustion usually re utilized as raw materials in construction industry The froth flotation process to recycle the residual carbon from coal gasification fine slag increases the higher heating value from to MJ/kg and upgrade the fuel
Wet separation processes of coal fly ash include gravity separation oil agglomeration separation and froth flotation Gravity separation methods such as interference bed separation Blissett 2013 and air jet hydrocyclone separation Niewiadomski 1999 are based on the density difference between carbon and ash particles
This article aims to study the effect of flotation reagent H511 on the removal of unburned carbon UC from fly ash The gas chromatography/mass spectrometry revealed that the main components in H511 were cyclohexanol d limonene longifolene and is found that the H511 could reacted with the UC surface through zeta
The fitted results from the data showed that for each size fraction the froth flotation of coal fly ash can be best described by the classical first order model Introduction Coal is the dominant energy source in China and its energy position will remain unchanged for the foreseeable future However the direct combustion of coal does great
The effect of particle size on the flotation behavior of coal fly ash was investigated in this study Three narrow particle size fractions −125 74 μm −74 45 μm and −45 μm and the unclassified particle size fraction of −500 μm of coal fly ash were chosen to study the basic properties by the measurement of induction time contact angle and wetting heat
Yang et al [27] conducted a flotation kinetic test on fly ash of different particle sizes and studied the effect of particle size on the flotation behavior of fly ash Xu et al