THERMODYNAMIC STUDYS OF THE PROCESSING OF MOLIBDENE-CONTAINING CATALYSTS FOR COMPLEX MIXED FERTILIZER

The article provides information about the possibility of obtaining complex mixed fertilizers, characterized by a high concentration of nutrients and trace elements that have high absorbing properties. To improve the properties of complex mixed mineralfertilizers, we propose the use of used molybdenum-containing catalysts as trace elements. As a result of physicochemical studies, the element-by-element composition and microstructure of the spent molybdenum-containing catalysts used in oil refining were determined. The microstructure corresponds to the element-by-element composition of the spent catalyst and, with an increase of 1000 times, crystals are pronounced, characterizing the bulk of the aluminate composition in the form of granular minerals, irregular hexagons, and worm-like inclusions of aluminum oxide and alumina. Molybdenum fills the interdimensional structure in the form of light, rounded crystals. Analysis of the primary information of thermodynamic studies of the CоO-NiO-MoO₃-CaCl₂-H₂O system showed the possibility of the formation of the following elements and compounds: O, O₂, H, H₂, OH, H₂O,Cl, Cl₂,HCl, HOCl, CoO₂H₂,CoCl, CoCl₂, Co₂Cl₄, Ni, NiO₂H₂,NiCl, NiCl₂, MoO₃, Mo₂O₆, MoO₄H₂, MoO₂Cl, Mo₅O₁₅,MoO2 MoOCl₂, MoO₂Cl₂, MoOCl₃, CaCl₂, CaOHCl, Ca(OH)₂. The results of thermodynamic modeling of the working system, characteristic of the chlorinating roasting of spent molybdenum-containing catalysts, showed the possibility of separating molybdenum, cobalt and nickel in the form of their chlorides in the range of 1300-1500K.It should be noted that with a decrease in pressure from 0.1 to 0.01 MPa, the metal sublimation becomes more efficient and reaches the formation of gaseous NiCl₂ to 19.45%, СоСl₂ g to 21.7%, MoO₂Cl₂ to 58.13%.Moreover, the selective separation of nickel and cobalt is possible at 1500 K and a pressure of 0.01 MPa.

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