Study on thermal stability of composite mixtures on the base of wood ash

The results from thermogravimetric and differential thermal analysis (TG-DTA) of nine composite mixtures, based on ash from burning of wood biomass, green lye from pulp production and ammonium sulphate ((NH4)(2)SO4) - by-product from cleaning of industrial waste gases, are presented. The content of different nutrients and the alkaline reaction of ashes are premise for their use as soil improvers. It is found that oxidation destruction and other reactions take place during the treatment and transformation of some. compounds in the primary raw materials. The chemical reactions permit to assess the mixture behaviour in soil systems that refers to nutrients assimilation through the plants roots. The determined temperature intervals for the transformation of the studied mixtures show that up to 70 degrees C no gaseous components are released by the nutrients and the studied products are relatively stable. The temperature intervals of the destruction processes occurring by oxidation or dehydration of the mixture components are determined. It is specified that destruction processes take place at higher temperatures, which could be achieved in the soil systems only after incidents with some chemicals or risk situations like fires.