Method for preparing composite phosphate
A technology of compound phosphate and phosphoric acid, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of low hydrogen chloride escape efficiency, difficulty in industrialized large-scale production, and difficulty in large-scale production, etc., and achieves simple and practical reaction equipment. The effect of continuous liquid in and out and short reaction time
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Embodiment 1
[0026] will contain K 2 O 59.3%; Cl - 46.98% KCl was added to the P 2 o 5 25.11% phosphoric acid solution, stir evenly in the batching tank, adjust H 3 PO 4 The / KCl molar ratio is 1.3. The feed liquid is transported to the spray drying tower for atomization, heated with high-temperature air, the feed amount of the atomizer and the inlet temperature of the hot air are controlled, and the inlet temperature of the spray drying tower is detected to be 235°C. The outlet temperature is 185°C. At this temperature, potassium chloride and phosphoric acid complete the metathesis reaction, and the hydrogen chloride gas produced enters the water scrubbing tower along with the tail gas to be washed to obtain hydrochloric acid. The bottom material flows into the cooling tank, cools and crystallizes to obtain compound phosphate.
Embodiment 2
[0028] A 33% potassium chloride solution was added to the P 2 o 5 41.6% phosphoric acid solution, stir evenly in the batching tank, adjust H 3 PO 4 The / KCI molar ratio was 2.0. Transport the feed liquid to the spray drying tower for atomization, use high-temperature air for heating, control the feed volume of the atomizer and the temperature of the inlet air, and detect that the inlet temperature of the spray drying tower is 150°C, and the outlet temperature of the spray drying tower is 83°C. At this temperature, potassium chloride and phosphoric acid complete the double decomposition reaction, and the produced hydrogen chloride gas enters the water washing tower along with the tail gas to be washed to obtain hydrochloric acid.
Embodiment 3
[0030] Add industrial sodium chloride with a content of 99.1% to the 2 o 5 24.38% phosphoric acid solution, stir evenly in the batching tank, adjust H 3 PO 4 The / NaCI molar ratio was 1.05. Transport the feed liquid to the spray drying tower for atomization, use high-temperature air for heating, control the feed volume of the atomizer and the temperature of the inlet air, and detect that the inlet temperature of the spray drying tower is 700°C, and the outlet temperature of the spray drying tower is 389°C. At this temperature, sodium chloride and phosphoric acid complete the double decomposition reaction, and the hydrogen chloride gas produced enters the water scrubber along with the tail gas to be washed to obtain hydrochloric acid, and the bottom material flows into the cooling tank for cooling and crystallization to obtain compound phosphate.
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