Nanobiotechnologies and chemical technologies 

Nanoporous Organo-Mineral Fertilizers obtained by using of Granule Shell Technology
Vakal S.V.1, Vakal V.S.1, Artyukhov A.E.2, Shkola V.Y.2, Yanovska G.O. 2
1 Scientific-Research Institute of Mineral Fertilizers and Pigments of the Sumy State University, 12, Kharkovskaya Str., Sumy, 40012, Ukraine
2 Sumy State University, Rymskogo-Korsakova str., 2, Sumy-40007, Ukraine. e-mail: yanovskaanna@gmail.com

It is known that the fertilizers with different compositions of shell coatings allow decreasing of environmental pollution by nitrates due to the decreasing of solubility of N-containing nucleus of the granule [1]. In this work the investigations of mineral N-containing fertilizers with phosphorite-based porous shell are presented. Carbamide granules, that are most important and widely used N-fertilizer in the world today, because of high content of N and the absence of acidic influence on the soil. 
To obtain phosphate-containing shell the phosphate-glauconite concentrate obtained from the Karpivski deposits together with phosphorite of the Verchnekamsk concentrate with additions of microelements in chelate form and calcium humate were used. The last one was used as plasticizer because of its slow solubility and positive impact into formation of agronomically valuable, water resistant soil structure. Calcium addition neutralizes soil acidity and decreases the loss of mineral components by the soil. The use of zeolite is necessary because of their ability to decrease gaseous and infiltrate loss of nitrogen and increase amount of potassium and productive humidity in the soil. 
Relation of coating mass to the mass of granule nucleus was calculated. Dependence of coatings porosity from granulation parameters and temperature of granulation were estimated. The pore size and shape, surface porosity mainly depends on amount of plasticizer and rolling time of granules. Obtained carbamide granules with phosphorite-based porous shell have micropores with the size up to 10 nm.

1.	Gurets L., Vakal V., Vakal S. Development of superphosphate based shells for the production of capsulated environmentally safe fertilizers // Environmental problems. -2018.-3(4).-P. 236-240.

Anknowledgement: Grant number 0120U102003 “Process of formation of the novel ecologically safe fertilizers with prolonged action based on the phosphorite deposits raw materials“.