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COMBINED TECHNOLOGY FOR PRODUCING COMPOUND FERTILIZERS FROM LOW- GRADE PHOSPHORITES FROM CENTRAL KYZYLKUM

Allamuratova A.J., Erkaev A.U., Reymov A.M.,Tairov Z.K., Ahmadjanov A.N..

Abstract

The question of the organisation of NPK fertilizers manufacture with the maintenance not less than 40 % of nutritious elements from phosphorites Central Kizikum is considered. In the developed flow sheet use of enriched and washed dried phosphorite containing 17-26 % P2O5 is provided. At low maintenance P2O5 in phosphorite raw materials it preliminary is exposed to acid enrichment. It was shown the possibility that nitrogen-phosphate-potassium fertilizers and nitro – ammophos – potassium can be prepared based on nitric and sulfuric acid processing low-grade phosphorite from Central Kyzyl Kum. The rough calculation of the consumption coefficients of obtaining nitro – ammophos – potassium and nitro-phosphate – potassium (mono- and dicalcium nitro-phosphate – potassium) at various CaO / P2O5 ratios in washed dried phosphorite with a content of 26% P2O5 was carried out. The triple fertilizers at least 40% nutrient elements are suitable for application in agriculture where their efficiency will have great significance in term of yield. The advantages of the developed scheme are the possibility of obtaining a concentrated NPK-fertilizer with balanced nutrients in it, flexibility, allowing to obtain various technical salts of phosphorus, low energy consumption, as well as the possibility of using any phosphate raw material.