Method for producing potassium nitrate from nitric acid phosphate fertilizer by-product calcium nitrate
A technology of nitrophosphate fertilizer and potassium nitrate, applied in nitrate fertilizer, nitrogen fertilizer, fertilization equipment, etc., can solve the problems of uneconomical, low nutrient content, high unit nutrient transportation cost, etc.
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Embodiment 1
[0049] Potassium chloride 1 is added into potassium bisulfate conversion tank 3 with 10.6 tons / hour speed, and 93% concentrated sulfuric acid 2 is added simultaneously with 14.8 tons / hour, feeds steam and maintains temperature and is 130 ℃, and the reaction time is 3 hours; After the reaction, hydrogen chloride gas 4 enters the hydrochloric acid absorption system 5 and is absorbed by water as hydrochloric acid; the potassium bisulfate solution 6 overflows to the potassium nitrate reaction tank 12.
[0050] When the equipment is initially started, the wet calcium nitrate crystals 27 produced by the nitric acid decomposition phosphate rock production phosphate fertilizer device 25 are directly added to the potassium nitrate reaction tank 12 at a rate of 36.0 tons / hour, mixed with the potassium bisulfate solution 6, reacted, and simultaneously passed into the steam, maintain the reaction temperature at 100°C, and the reaction time is 2 hours; after potassium nitrate reaction solut...
Embodiment 2
[0055] Potassium chloride 1 is added to potassium bisulfate conversion tank 3 at a rate of 10.6 tons / hour, 95% concentrated sulfuric acid 2 is preheated to 100°C at 14.2 tons / hour and added at the same time, the temperature is maintained at 150°C by feeding steam, and the reaction time is 6 hours After the reaction, the hydrogen chloride 4 goes to the hydrochloric acid absorption system 5, and is absorbed by water as hydrochloric acid; the potassium bisulfate solution 6 overflows to the potassium nitrate reaction tank 12.
[0056] When the equipment is initially started, the wet calcium nitrate crystals 27 produced by the plant 25 for producing phosphate fertilizer by decomposing phosphate rock with nitric acid are directly added to the potassium nitrate reaction tank 12 at a rate of 40.0 tons / hour, mixed and reacted with the potassium bisulfate solution 6, and simultaneously passed into the steam, maintain the reaction temperature at 130°C, and the reaction time is 1 hour; aft...
Embodiment 3
[0062] Potassium chloride 1 is added into the potassium bisulfate conversion tank 3 at a rate of 10.6 tons / hour, and 98% concentrated sulfuric acid 2 is added at the same time at 18.5 tons / hour, and the temperature is maintained at 120°C by feeding steam. After 8 hours of reaction, the hydrogen chloride 4 is absorbed by hydrochloric acid System 5 is absorbed by water as hydrochloric acid; potassium bisulfate solution 6 overflows to potassium nitrate reaction tank 12.
[0063] When the equipment is initially started, the wet calcium nitrate crystal 27 produced by the nitric acid decomposition phosphate rock production phosphate fertilizer device 25 is added to the potassium nitrate reaction tank 12 at a rate of 54.0 tons per hour, mixed with the potassium bisulfate solution 6, reacted, and steam is introduced at the same time , maintain the reaction temperature at 80° C., and the reaction time is 4 hours; the potassium nitrate reaction solution 13 is filtered through the filter ...
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