Properties of australian fly ashes relevant to their agronomic utilization

Aitken R.L., Campbell D.J. and Bell L.C. (1984) Properties of australian fly ashes relevant to their agronomic utilization. Australian Journal of Soil Research, 22 4: 443-453. doi:10.1071/SR9840443

Author Aitken R.L.
Campbell D.J.
Bell L.C.
Title Properties of australian fly ashes relevant to their agronomic utilization
Journal name Australian Journal of Soil Research   Check publisher's open access policy
ISSN 0004-9573
Publication date 1984-01-01
Sub-type Article (original research)
DOI 10.1071/SR9840443
Volume 22
Issue 4
Start page 443
End page 453
Total pages 11
Language eng
Subject 2304 Environmental Chemistry
1111 Soil Science
Abstract Of the 13 fly ashes from Australian power stations, all were dominated by both amorphous and crystalline aluminosilicates and quartz, and these were associated with minor amounts of Fe oxides, lesser amounts of Ca, Mg, Na, K, Ti and P oxides, and variable levels of incompletely combusted C. The ashes consisted of particles predominantly in the silt plus fine sand fraction (67-98%), and electron microscopy revealed that ash matrices consisted of glassy spherical particles and less regularly shaped spongy particles. The available water capacity was high and varied from 27 to 105% with 11 of the 13 samples having values > 40%. Twelve of the 13 ashes were alkaline to strongly alkaline (pH range 8.0-12.8). Soluble salt levels were related to the coal source, and electrical conductivity of the saturation extracts (ECse) varied from 0.63 to 7.0 mS cm -1 for 11 of the samples; two ashes produced from brown coal had ECse values of 46.0 and 55.0 mS cm-1. The nutritional status of the ashes was assessed on samples leached with water to reduce the soluble salts to equilibrium levels. The ashes contained negligible amounts of N, but their P status was variable. The amounts of NH4OAc-extractable Ca and Mg were generally high in most samples and were considered more than adequate for most plant species; however, NH4OAc-extractable K values were generally low. Adequate levels of sulfate-S existed in 12 of the 13 samples, and levels of DTPAextractable Cu, Zn, Mn and Fe were high when compared with published critical values. Most of the unleached samples contained potentially toxic levels of B. The results are discussed with reference to the establishment of vegetation on ash dumps and to the use of fly ash in ameliorating the properties of soils.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
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