Cyclic Technology for Obtaining Double, Triple Superphosphate and Concentrated Nitrogen-Phosphorus Fertilizer from Low-Grade Phosphorites of Central Kyzylkum

Abdullayev S.S; Mamajonov O.A; Alimov U.K; Ortiqova S.S

Authors

Abdullayev S.S Master's Degree Student, Department of Chemical Technology, Fergana Polytechnic Institute, Fergana, Republic of Uzbekistan
Mamajonov O.A Master's Degree Student, Department of Chemical Technology, Fergana Polytechnic Institute, Fergana, Republic of Uzbekistan
Alimov U.K DSc, Leading Researcher, Institute of General and Inorganic Chemistry of the Academy of Sciences of Uzbekistan
Ortiqova S.S PhD, Associate Professor of the Department of Chemical Technology, Fergana, Uzbekistan

Keywords:

phosphorites of the Central Kyzylkum, phosphoric acid, kinetics, NP fertilizer

Abstract

This article presents data from studies on the processing of low-grade phosphorites into unilateral and complex phosphorus fertilizers in a cyclic way. Based on the neutralization of acidic products of monocalcium phosphate isolated from the crystallization process, off-balance ore and limestone, double and triple superphosphates were obtained with a content of: Р2О5tot. from 44.43 to 47.09%; Р2О5usv. : Р2О5tot. = 94.24-97.86% and Р2О5tot. from 50.05 to 53.38%; Р2О5usv. : Р2О5tot. = 97.08-99.59%, respectively. And by neutralizing acid monocalcium phosphate with ammonia to pH = 4.5-4.8, NP-fertilizers were obtained with the content (wt.%): N from 8.97 to 10.12; Р2О5 tot. from 55.18 to 56.64 with relative water form Р2О5 aq. from 79.85 to 85.91%.