Organo-Mineral Fertilizers from Ammoniated Lignites

Refika Kurbanli1, Erol Pehlivan1, Gulnare Ahmetli2, Nejdet Sen1,

Ahmet Kocak3, Firengiz Novruzova4

1Department of Chemical Engineering, Selcuk University, Konya, Turkey

2Department of Environmental Engineering, Selcuk University, Konya, Turkey

3Department of Chemistry, Selcuk University, Konya, Turkey

4Anorganic Chemistry Institute, Azerbaijan Science Academy, Baku, Azerbaijan


Humic acids, which has a very important role in plant development, are very important for organo-mineral fertilizer production. In obtaining organo-mineral fertilizers, humic acids are converted too suitable salts which are water-soluble and plants can easily uptake these salts. Previous studies indicated that, humic acid content and ammonia absorption capacity of lignites are the most important factors affecting their ability to utilize as organo-mineral fertilizer. Since the composition of lignites is the combination of various organic compounds, in this work, three local low quality lignites (from Beyşehir, Ilgın and Ermenek obtained from Konya region in Turkey) were utilized in the organo-mineral fertilizer production by ammonification. To do this first, lignites were fractionated by extraction method, then humic acid contents in their structures were determined and their properties were studied. After these principle studies, ammonification of these lignites was performed. It was estimated that, the consumption of ammonia depends on lignite mesh sizes and the optimum mesh size is 100 mesh. The humic acid analysis showed that the amount of humic acid depends on the depth of the reserve and percentage rises from 24.9 to 32.4% from the bottom to the top layer of the reserve. The effects of ammonia concentrations, temperature of the reaction medium and mixing velocity on nitrification reaction were studied. It was found that, the nitrogen content of ammonificated lignite increased from 1-1.5% to 7-12.9% when the temperature was between 20-50C and in ammonia concentration of 15-25%. Therefore, it was proved that they can be used as organo-mineral fertilizer in agricultural areas.