A production method for preparing tricalcium phosphate by-product special fertilizer for rye
A technology of tricalcium phosphate and production method, applied in chemical instruments and methods, applications, phosphorus compounds, etc., can solve problems such as affecting the yield and quality of rye planting, waste of nitrogen, phosphorus and potassium elements, and influence on the purity of tricalcium phosphate products. , to achieve significant environmental protection value and economic benefits, avoid the discharge of waste liquid, and make up for the cost of impurity removal
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Embodiment 1
[0045] A production method for preparing tricalcium phosphate by-product special fertilizer for rye, comprising the following steps:
[0046] (1) Preparation of intermediate slurry: React phosphoric acid and carbonamide in a stirred reactor at a temperature of 110°C, and control the molar ratio of phosphoric acid and carbonamide to 1.7:1, stirring at a stirring speed of 45r / min After reacting for 30min, the intermediate slurry was obtained;
[0047] (2) Synthesis of tricalcium phosphate slurry: add a calcium hydroxide solution that is 1.2 times the molar weight of carbonamide into the intermediate slurry, and control the reaction temperature to 70°C. When the reaction reaches 30min, detect the pH value and wait for When the pH value is 8, the reaction is terminated, and it is transferred to a cooling crystallizer, and the temperature is lowered to 45°C, so that tricalcium phosphate crystals are precipitated, and the content of nitrogen, phosphorus, and calcium in the crystalli...
Embodiment 2
[0054] A production method for preparing tricalcium phosphate by-product special fertilizer for rye, comprising the following steps:
[0055] (1) Intermediate slurry preparation: use phosphoric acid and carbonamide to react in a stirred reactor at a temperature of 120°C, and control the molar ratio of phosphoric acid and carbonamide to 2.3:1, and stir at a stirring speed of 60r / min After reacting for 70min, intermediate slurry was obtained;
[0056] (2) Synthesis of tricalcium phosphate slurry: add calcium hydroxide solution with 1.7 times the molar weight of carbonamide to the intermediate slurry, and control the reaction temperature to 90°C. When the reaction reaches 70min, check the pH value and wait for When the pH value is 9, the reaction is terminated, and it is transferred to a cooling crystallizer, and the temperature is lowered to 40°C, so that tricalcium phosphate crystals are precipitated, and the content of nitrogen, phosphorus, and calcium in the crystallization l...
Embodiment 3
[0063] A production method for preparing tricalcium phosphate by-product special fertilizer for rye, comprising the following steps:
[0064] (1) Intermediate slurry preparation: use phosphoric acid and carbonamide to react in a stirred reactor at a temperature of 115°C, and control the molar ratio of phosphoric acid and carbonamide to 2:1, and stir at a stirring speed of 55r / min After reacting for 50min, the intermediate slurry was obtained;
[0065] (2) Synthesis of tricalcium phosphate slurry: add calcium hydroxide solution with 1.5 times the molar weight of carbonamide to the intermediate slurry, and control the reaction temperature to 80°C. When the reaction reaches 50min, detect the pH value, and wait for When the pH value is 8.5, the reaction is terminated, and it is transferred to a cooling crystallizer, and the temperature is lowered to 35°C, so that tricalcium phosphate crystals are precipitated, and the content of nitrogen, phosphorus, and calcium in the crystalliza...
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