A kind of production method of preparing calcium hydrogen phosphate by-product gourd special fertilizer
A technology of calcium hydrogen phosphate and production method, applied in chemical instruments and methods, applications, phosphorus compounds and other directions, can solve the problems of low raw material recovery rate, large production cost, large waste of resources, etc., and achieves reduction of production cost, quality assurance, The effect of avoiding the discharge of waste liquid
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Embodiment 1
[0044] A production method for preparing calcium hydrogen phosphate by-product gourd special fertilizer, comprising the following steps:
[0045] (1) Preparation and mixing of raw materials: Phosphoric acid and carbonamide are placed in a stirred reactor at a molar ratio of 1.5:1, at a temperature of 100°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;
[0046] (2) Preparation of calcium hydrogen phosphate: Add alkaline calcium salt into the reaction kettle containing the intermediate slurry obtained in step 1) at a uniform speed for 2 hours, control the pH value to 5.5, continue stirring for 5 minutes, and then finish the reaction to obtain Slurry containing calcium hydrogen phosphate;
[0047] (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 15 seconds, coo...
Embodiment 2
[0054] A production method for preparing calcium hydrogen phosphate by-product gourd special fertilizer, comprising the following steps:
[0055] (1) Preparation and mixing of raw materials: Phosphoric acid and carbonamide are placed in a stirred reactor at a molar ratio of 2.1:1, at a temperature of 130°C, and the stirring speed of the stirred tank is controlled at 200r / min to stir and mix for 5 hours to obtain an intermediate slurry;
[0056] (2) Preparation of calcium hydrogen phosphate: Add alkaline calcium salt into the reaction kettle containing the intermediate slurry obtained in step 1) at a constant speed for 3 h, control the pH value to 6.5, continue stirring and reacting for 20 min, and the reaction ends to obtain Slurry containing calcium hydrogen phosphate;
[0057] (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 15s, cool d...
Embodiment 3
[0064] A production method for preparing calcium hydrogen phosphate by-product gourd special fertilizer, comprising the following steps:
[0065] (1) Preparation and mixing of raw materials: Put phosphoric acid and carbonamide at a molar ratio of 1.7:1 in a stirred reactor at a temperature of 110°C and control the stirring speed of the stirred tank at 190r / min to stir and mix for 4 hours to obtain an intermediate slurry;
[0066] (2) Preparation of calcium hydrogen phosphate: Add alkaline calcium salt at a constant speed for 2.5h into the reaction kettle containing the intermediate slurry obtained in step 1), control the pH value to 6, continue stirring and reacting for 15min, and the reaction ends. Obtain the slurry containing calcium hydrogen phosphate;
[0067] (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 14°C within 15s, cool down to cyclic c...
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