Abstract
Coal-fired thermal power plants (TPP) generate large amounts of ash and slag wastes (ASW), therefore ecological problems related to ASW storage and disposal for such power plants come to the fore. To obtain new data on ASW properties analysis of a number of ASW samples from ash dump No. 4 of Cherepet’ TPP was carried out as part of engineering surveys. The purpose of this study included determiantion of the ASW granulometrical and mineralogical composition, as well as their physical and chemical properties. During field works 4 ASW samples were taken from the surface layer of the ash dump plus one sample of ash froth for further laboratory analysis. Laboratory analysis enabled determination of the granulometrical, mineralogical and chemical composition of ASW. Assessment of the ASW corrosiveness toward various materials determined necessary limitations in utilization of ASW-based bulding materiasls in contact with steel and aluminum. The content of natural radionuclides of K 40 , Ra 226 , Th 232 and man-made Cs 137 in ASW was determined. The detected increased activity of Ra 226 and Th 232 necessitates additional studies of radon and thoron emissions from ASW. Microspheres recovered from ash froth during ASW utilization have special usage value.
Highlights
Coal-fired thermal power plants (TPP) generate large amounts of ash and slag wastes (ASW), ecological problems related to ASW storage and disposal for such power plants come to the fore
During field works 4 ASW samples were taken from the surface layer of the ash dump plus one sample of ash froth for further laboratory analysis
It is known that coal-fired thermal power plants (TPPs) produce large amounts of ash and slag wastes (ASW)
Summary
It is known that coal-fired thermal power plants (TPPs) produce large amounts of ash and slag wastes (ASW). Coal-fired TPP in Russia produce about 30 Mt of ASW per year, not more than 10 % of which are recycled [1, 2] In this regard, ecological problems related to ASW storage and disposal for such power plants have top priority [1, 3, 4]. ASW have many properties typical for different kinds of natural mineral raw materials. They have an undeniable resource potential for production of various building materials [1, 5, 6]. The purpose of this study included determiantion of the ASW granulometrical and mineralogical composition, as well as their physical and chemical properties
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