A kind of production method of preparing calcium hydrogen phosphate by-product special pepper fertilizer
A technology of calcium hydrogen phosphate and production method, applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer and other directions, can solve problems such as insufficient purity, insufficient utilization rate of waste liquid, environmental pollution, etc., and achieves reduction of production cost, Significant environmental protection value and economic benefits, the effect of avoiding the discharge of waste liquid
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Embodiment 1
[0052] A production method for preparing calcium hydrogen phosphate byproduct pepper special fertilizer, specifically comprising the following steps:
[0053] (1) Preparation and mixing of raw materials: Phosphoric acid and carbonamide are placed in a stirred reactor at a molar ratio of 1.9:1, at a temperature of 90°C, and the stirring speed of the stirred tank is controlled at 180r / min to stir and mix for 3 hours to obtain an intermediate slurry;
[0054] (2) Preparation of calcium hydrogen phosphate: then add soluble calcium salt into the reaction kettle containing the intermediate slurry obtained in step 1) at a constant speed for 2 h, control the pH value to 5.5, continue stirring and reacting for 5 min, and the reaction ends to obtain Slurry containing calcium hydrogen phosphate;
[0055] (3) Cyclic crystallization filtration: place the slurry containing calcium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 15°C within ...
Embodiment 2
[0062] A production method for preparing calcium hydrogen phosphate byproduct pepper special fertilizer, specifically comprising the following steps:
[0063] (1) Preparation and mixing of raw materials: Phosphoric acid and carbonamide are placed in a stirred reactor at a molar ratio of 2.3:1, at a temperature of 110°C, and the stirring speed of the stirred tank is controlled at 200r / min to stir and mix for 4 hours to obtain an intermediate slurry;
[0064] (2) Preparation of calcium hydrogen phosphate: Add soluble calcium salt 3h at a constant speed into the reaction kettle containing the intermediate slurry obtained in step 1), control the pH value to 6.5, continue to stir and react after 15min, and the reaction ends to obtain Slurry containing calcium hydrogen phosphate;
[0065] (3) Cyclic crystallization and filtration: place the slurry containing calcium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 10° C. within 20 se...
Embodiment 3
[0072] A production method for preparing calcium hydrogen phosphate byproduct pepper special fertilizer, specifically comprising the following steps:
[0073] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide at a molar ratio of 2.1:1 in a stirred reactor at a temperature of 100°C and control the stirring speed of the stirred tank at 190r / min to stir and mix for 3.5 hours to obtain intermediate body slurry;
[0074] (2) Preparation of calcium hydrogen phosphate: Add soluble calcium salt into the reaction kettle containing the intermediate slurry obtained in step 1) at a constant speed for 2.5 h, control the pH value to 6, continue stirring and reacting for 10 min, and the reaction ends. Obtain the slurry containing calcium hydrogen phosphate;
[0075] (3) Cyclic crystallization and filtration: place the slurry containing calcium hydrogen phosphate obtained in step 2) in a cooling crystallizer to cool down to a temperature of 13°C within 20s, coo...
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