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Waste Management & Research, Vol. 14, No. 1, 15-28 (1996)
DOI: 10.1177/0734242X9601400103

Physico-Chemical Characterization and Leaching of Desulphurization Coal Fly Ash

I. Lecuyer

Electricité de France, Direction des Etudes et Recherches, Département Environnement, 6 Quai Watier, 78400 Chatou, France

S. Bicocchi

Electricité de France, Direction des Etudes et Recherches, Département Environnement, 6 Quai Watier, 78400 Chatou, France

P. Ausset

Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris X, Val de Marne, URA CNRS 1404, 61 Av. du Général de Gaulle, 94010 Creteil Cédex, France

R. Lefevre

Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris X, Val de Marne, URA CNRS 1404, 61 Av. du Général de Gaulle, 94010 Creteil Cédex, France

Fly ash produced by coal combustion using two types of desulphurization process were studied: a conventional pulverized coal boiler equipped with lime injection (PCL ash), and a circulating fluidized bed combustion boiler with limestone injection (CFBC ash). The ashes were characterized completely: granulometry, morphology, mineralogy, chemical composition and behaviour to water contact.

Both PCL ash and CFBC ash present similar features: fine granulometry, presence of anhydrite phase and sulphate content. However, PCL ash also shows lots of spherical particles, unlike CFBC ash, and a much higher lime content, due to the lower desulphurization rate in PC boilers. Unlike CFBC ash, most of the trace elements in PCL ash show an inverse concentration-particle size dependence.

Leachates obtained from both samples are rich in soluble salts [CaSO4 and Ca(OH) 2] and arsenic and selenium are prevented from solubilizing by high lime content.

In wetted PCL ash, the formation of ettringite crystals stabilizes calcium and sulphate ions. Simultaneously, arsenate, selenate and chromate anions are trapped in the crystal. CFBC ash does not really harden because the lime content is too low. However, the leached selenium concentration is cut down in wetted CFBC ash samples. © 1996 ISWA

Key Words: Fly ash • desulphurization • trace element • leaching • furnace sorbent injection • circulating fluidized bed combustion • arsenic • selenium • chromate.


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 J. Environ. Qual.Home page
T. Wang, J. Wang, J. G. Burken, H. Ban, and K. Ladwig
The Leaching Characteristics of Selenium from Coal Fly Ashes
J. Environ. Qual., October 24, 2007; 36(6): 1784 - 1792.
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