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PHYSICAL AND CHEMICAL CHARACTERISTICS OF KOSOVS LIGNITE FLY ASH

Ibrahim Krasniqi

Abstract

Lignite is one of the minerals which have impacted largely the development and technological revolution of human society. Du ring the coal use, there are mineralogical remains in the form of ashes, which have different physical, chemical, mineralogical and morphological properties, which largel y depend on the type of coal used, and technology in its combustion. This type of ashe s is presented in thermal power plants in the form of dust or fly ash and inorganic remains, which are separated from the process by different methods. Depending on the type and content, these materials bear a positive role in the attributes of materials produced by their addition and in the majority of cases they add up to strength, durability, reducing water demand, hence modifying material attributes in a positive direction. These ash remains are usually divided in two groups or classes, depending from their chemical struct ure, and here the content of calcium is specifically important. The ash with a high presence of Si and a relatively low content of Ca pertains to the F class, while the ash with a high content of Ca pertains to the C Class. Ashes analyzed in Kosovo TPP-s pertain to F Class. Benefits from the use of these remnants as increment is not only im portant for the positive impact in material attributes where it is used, but there are al so other impacts of a specific importance. Thus, we believe that the key benefits ca n be divided into: engineering benefits, economic benefits and ecological benefits Hence, considering problems that Kosovo has with the deposit of very large amounts of fly ash remnants, and the plans for construction of new TPP-s, we thought that st udies and analysis of possible lignite fly ash utilization in other branches of indus try would be of a specific importance and would have positive impacts in reducing cost, reducing the environmental pollution extent, and saving energy. For chemical and physical investigation fly ash samples from different units of Kosovo Power Plants were chosen and tested in laboratory as additive material in University of Freiberg, Germany. The results obtained show the characteristics and possibility to use lignite fly ash for the production of self – compacting materials as well shows that Kos ovo lignite fly ash can be used for other industry branches.

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