Some remarks on the Gauss-Bonnet formula
1969
Phosphate acid sludges formed in the production of wet process phosphoric acids are converted to potassium polyphosphates by reaction with a potassium salt at elevated temperatures. Sodium salts may be introduced to reduce the fusion temperature and magnesium compounds with an increase in fusion temperature; the reaction system will also accept a variety of micronutrients. The potassium polyphosphate product formed has a high degree of citrate solubility establishing its excellent utility as a fertilizer.
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