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 ...
In this paper, the use of froth flotation to remove the unburned carbon from fly ash is described. Three different fly ashes were studied that had loss-on-ignition (LOI) values of 6.79, 6.90, and ...
The effect of diesel emulsification using sodium petroleum sulfonate on carbon flotation from fly ash. Waste Manage (2019) L.u. Yang et al. On the utilization of waste fried oil as flotation collector to remove carbon from coal fly ash. ... The result of surfactants on froth flotation of unburned carbon from coal fly ash. Fuel, Volume 190, …
Coal fly ash (CFA) is one of the industrial byproducts of burning coal for energy production and has unburned carbon, which negatively affects its full potential …
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. …
Flotation was carried out using Denver flotation cell with constant water level arrangement and froth scrapping facility. Characterization of the recovered unbumt carbon from fly …
The unburned carbon content of fly ash from two different power stations was greatly reduced in two-stage laboratory flotation tests by employing a collector consisting of nonylphenol and either hexadecane or fuel oil together with methyl isobutinol (MIBC) as a frother. The tailings from the first stage were recleaned in the second stage. …
A large amount of carbon dust is generated in the process of aluminum smelting by molten salt electrolysis. The carbon dust is solid hazardous waste but contains a large quantity of recyclable components such as carbon and fluoride. How to recycle carbon dust more effectively is a challenge in the aluminum electrolysis field. In this …
After weathering of MSWI fly ash, more oxygen-containing functional groups on the unburned carbon surface easily came into being and accordingly made them more difficult to remove by froth flotation (Huang et al., 2003b). In addition, powder activated carbon in HSWI fly ash is naturally hydrophobic due to their hydrocarbon nature and …
The unburned carbons have been efficiently separated from clean ash, which is a value-added product for the concrete industry, with the separation technologies such …
Separation of unburned carbon from fly ash is an efficient way to achieve a higher efficiency in the utilization of waste fly ash and greater economic and environmental benefits. This review highlights current methods for separating unburned carbon from fly ash, such as sieving, gravity separation, electrostatic separation, froth …
Studies on carbon flotation from fly ash. Fuel Process Technol, 139 (2015), pp. 236-241. View PDF View article View in Scopus Google Scholar [8] ... Effect of frothers on removal of unburned carbon from coal-fired power plant fly ash by froth flotation. Sep Sci Technol, 53 (2018), pp. 535-543. CrossRef View in Scopus Google …
Huang et al. [15] successfully recovered 61.7% of the carbon from fly ash by using a flotation column with optimum parameter values, i.e., flotation time of 30 min, gas flow rate of 0.7 L/min, and ...
Froth flotation is widely used as a simple method for separating unburned carbon particles from waste fly ash. Future work should be focus on the development of high-efficiency flotation reagents (including collectors and frothers) for unburned …
ABSTRACT The effect of single frothers and their blends on bubble size, froth stability, and unburned carbon (UC) flotation performance was studied. Methyl isobutyl carbinol that produces smaller bubbles is efficient in floating ultrafine particles and producing concentrate. DF-250 that gives higher froth stability is effective for recovering …
After weathering of MSWI fly ash, more oxygen-containing functional groups on the unburned carbon surface easily came into being and accordingly made them more difficult to remove by froth flotation (Huang et al., 2003b). In addition, powder activated carbon in HSWI fly ash is naturally hydrophobic due to their hydrocarbon nature and this ...
The tailings from the first stage were recleaned in the second stage. This method reduced the carbon content of fly ash from an initial level of 25.9% in one case and 16.5% in another case to a final level of 1–2% or less in the tailings while at the same time recovering 95% or more of the carbon in the floated material or concentrate.
The efficiency of the flotation of the fine unburned carbon from coal fly ash (CFA) is closely dependent on the dispersion of the collector on the carbon surface. In this work, we carried out the ...
A commercial flotation plant with a handling capacity of 110 ton coal fly ash (dry basis) per hour was set up. Using the optimum operational parameters, a clean ash with loss on ignition (LOI) of ...
This review highlights current methods for separating unburned carbon from fly ash, such as sieving, gravity separation, electrostatic separation, froth flotation, and …
Unburned carbon can be segregated from CFA for beneficial reuse by sieving, 7 gravity separation, 8 electrostatic separation, 9 froth flotation, 10 acid digestion, and sink-float technique (density separation). 11 At present, froth flotation is commonly used as a separation technique in the concentrating and coal beneficiation industries ...
Eisele and Kawatra used froth flotation to remove unburned carbon from fly ash, which reduced the LOI of fly ash from 6–11% to less than 2% . Walker and Wheelock successfully separated unburned carbon and tailings from Class F fly ash by froth flotation, and the recovery of unburned carbon reached above 95% .
Sepn. of unburned carbon from fly ash is an efficient way to achieve a higher efficiency in the utilization of waste fly ash and greater economic and environmental benefits. This review highlights current methods for sepg. unburned carbon from fly ash, such as sieving, gravity sepn., electrostatic sepn., froth flotation, and oil agglomeration.
Roles of carrier particles in froth properties of fly ash flotation was highlighted. •. Interaction between carrier particles and UC and ash particles was …
1. Introduction. It has been estimated that 750 million tons of coal fly ash is generated on a global basis annually, and the global fly ash utilization figure is estimated to be 25% [1]. Carbon content in fly ash is within the range of 0.1–25% [2], [3]. Fly ash is mainly used as a raw material for adsorbents, ceramics, glasses, geo-polymers ...
The flotation results indicated that calcium chloride reduced the performance of unburned carbon removal from the coal fly ash, whereas sodium chloride increased froth stability thereby improving ...
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.