Eco-friendly Synthesis of Calcium Nitrate Fertilizer from Industrial Limestone Waste
T. T. Otakuziyev
*
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
Sh. S. Namazov
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
A. A. Mamataliyev
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
O.A. Badalova
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
T. N. Orinbayev
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
*Author to whom correspondence should be addressed.
Abstract
This research investigates the potential application of limestone waste, sourced from the Andijan deposit, as a viable raw material for the synthesis of granular calcium nitrate fertilizers. The study employs a systematic process wherein calcium-rich limestone residues are treated with nitric acid to facilitate the conversion into a nitrogen-enriched compound. Subsequent granulation of the resultant material yields a high-quality granular fertilizer with enhanced agronomic value. This approach underscores a sustainable and innovative strategy for valorizing industrial mineral by-products, thereby contributing to waste minimization and promoting environmentally responsible agricultural inputs. The findings demonstrate the feasibility of transforming locally available mineral waste into a product with considerable significance for improving soil fertility and crop productivity, aligning with circular economy principles and sustainable agricultural development.
Keywords: Limestone waste, calcium nitrate fertilizer, nitric acid treatment, fertilizer granulation, circular economy