Dry beneficiation of high loss-on-ignition fly ash

Soong, Yee; Schoffstall, M.R; Gray, McMahan L.; Knoer, James P.; Champagne, Kenneth J; Jones, Rhys Jon; Fauth, Daniel J.

doi:10.1016/s1383-5866(01)00162-9

Cited by 43 publications

(19 citation statements)

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“…Dry sieving was used, since it represents a simple approach to separating material and developments have seen this receive attention for processing fly ash [6,33]. The method is influenced by several factors [34], including the size and shape of particles relative to the sieve apertures and the mesh size itself.…”

Section: Processing Techniquesmentioning

confidence: 99%

Dry-processing of long-term wet-stored fly ash for use as an addition in concrete

McCarthy

Dhir

et al. 2018

Cement and Concrete Composites

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Section: Processing Techniquesmentioning

confidence: 99%

Dry-processing of long-term wet-stored fly ash for use as an addition in concrete

McCarthy

Dhir

et al. 2018

Cement and Concrete Composites

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“…There are numerous methods for the recovery of unburned carbon from CFA (Hwang et al 2002). Electrostatic separation is one of them, has been used by many authors Soong et al 2002). This method operates in a controlled electrode potential condition following the principle of bipolar charging of dry particles either by particle-particle contact or by particle-wall collision under turbulent conditions.…”

Section: Unburned Carbonmentioning

confidence: 99%

Recovery of metals and other beneficial products from coal fly ash: a sustainable approach for fly ash management

Sahoo

Kim

Powell

et al. 2016

Int J Coal Sci Technol

123

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Increasing production and disposal of coal fly ash (CFA) is a matter of serious environment concern. However, CFA contains various beneficial metals and mineral matters whose demand is increasing in the industrialized world, while natural supplies are diminishing. Therefore, recovery of these potential resources from CFA can be an alternative way to save mineral resources, as well as to reduce the environmental burden of CFA disposal. There are numerous methods developed for the recovery of beneficial products from CFA. Based on the US patents and journal literatures, the present review describes the recovery status and technologies of major elements such as Al, Si, Fe and Ti, and trace elements such as V, Ga, Ge, Se, Li, Mo, U, Au, Ag, Pt groups and rare earth elements (REEs) and other beneficial products such as magnetic materials, cenospheres, and unburned carbon from CFA. It also highlights the recovery efficiency and drawbacks for their extraction, and suggests future research to develop satisfactory results in terms of selective recovery and purification.

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“…Fly ash utilization as partial replacement for cement in making concrete often hindered due to the presence of high amount of unburnt carbon, which is indicated by its high loss-on-ignition (LOI) content. ASTM C618 limits the carbon content not more than 6% to prevent discoloration, poor air entraintment and segregation of fresh concrete mixture [1].…”

Section: Introductionmentioning

confidence: 99%

“…Beneficiation of fly ash has been studied in recent years and several methods have been proposed to separate good quality cementitious material from the combustible one, such as separation [2,4], wet milling and acid leaching [5], thermal treatment in fluidized bed reactors [6], ultrasonic sieving and triboelectrostatic separation [1,7], grinding in eccentric vibratory mill [8,9], and reburning [10]. However, most of the methods normally involve complex processes.…”

Section: Introductionmentioning

confidence: 99%

Simple Mechanical Beneficiation Method of Coarse Fly Ash with High LOI for Making HVFA Mortar

Antoni

Satrya

Hardjito

2015

ced

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This study focusses on the effect of milling of fly ash obtained from four different sources on the properties of high volume fly ash (HVFA) mortar. Two fly ash samples with low loss-on-ignition (LOI) were taken from a coal-fired power plant, while the other two with high LOIs were obtained from a textile factory and from a paper mill, respectively. Milling was performed using a rod mill at a certain period of time. The workability of HVFA mortar with constant water to cementitious ratio was controlled by adjusting the superplasticizer content. The results show that the specific gravity of fly ash increases after milling. Utilizing milled fly ash ends up with significant strength increase of HVFA mortar, especially those utilizing high LOI fly ash. This shows that milling is an excellent fly ash beneficiation technique, especially on the one with high LOI value.

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Dry beneficiation of high loss-on-ignition fly ash

Cited by 43 publications

References 1 publication

Dry-processing of long-term wet-stored fly ash for use as an addition in concrete

Dry-processing of long-term wet-stored fly ash for use as an addition in concrete

Recovery of metals and other beneficial products from coal fly ash: a sustainable approach for fly ash management

Simple Mechanical Beneficiation Method of Coarse Fly Ash with High LOI for Making HVFA Mortar

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