Abstract
1. 2% Citric Acid soluble phosphates were obtained by heating mixtures of Sodium Chloride and KITADAITO Aluminium Phosphate Rock about 800℃ in the Water Vapor atmosphere. These products contained also water soluble phosphate and were very hygroscopic. 2. When adding Idaho Phosphate Rock to these mixtures and heating on the same conditions, water soluble phosphates decreased extremely and Idaho Phosphate Rock were almost decomposed and became 2% Citric Acid soluble form. These products were not hygroscopic and P_2O_5 contained in the products were almost soluble in 2% Citric Acid. 3. The mechanism of these reactions was presumed as follows : KITADAITO Aluminium Phosphate Rock were decomposed by Sodium Hydroxide which formed by the reaction between Sodium Chloride and Water Vapor above 700℃, and sodium aluminium phosphates and Sodium Phosphates were formed. These products then decomposed Idaho phosphate rock and final products may be contains Al_2Na_3(PO_4)_3,Al_2Ca_3Na_6(PO_4)_6,CaNaPO_4 etc. 4. Manufacturing conditions of these phosphatic fertilizers utilizing reactions above mentioned were studied.
