Production method of industrial grade diammonium phosphate with wet-process phosphoric acid
A technology of high-grade diammonium phosphate and wet-process phosphoric acid, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of high energy consumption in the production process, unstable product quality, high cost, etc., and achieve low production cost, good society and Economic benefits, energy consumption and low cost effects
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Embodiment 1
[0031] Will P 2 o 5Wet-process phosphoric acid with a concentration of 25% is fed into the neutralization tank, and ammonia gas is introduced into the neutralization tank under stirring conditions. When the pH value of the slurry is 4.3, the ammonia flow is stopped, and the slurry is filtered while it is hot. Sent to the compound fertilizer plant to produce fertilizer-grade monoammonium phosphate compound fertilizer, the filtrate enters the secondary neutralization tank; in the secondary neutralization tank, continue to feed ammonia gas for neutralization, stop passing ammonia when the pH value of the slurry reaches 7.0, and the secondary neutralization tank After the secondary neutralization is completed, it is sent to the purification tank; in the purification tank, ammonium sulfide is added to the secondary neutralization slurry to stir and react. After passing the test, stop adding ammonium sulfide, filter and separate with a centrifuge, and the filter cake metal slag is u...
Embodiment 2
[0033] Will P 2 o 5 The wet-process phosphoric acid with a concentration of 30% is sent into the neutralization tank, and the ammonia water with a mass concentration of 25% is added to the neutralization tank under stirring conditions, and the ammonia water is stopped when the pH value of the slurry is 4.5, and the slurry is hot. Filtration, the filter cake is sent to the compound fertilizer plant to produce fertilizer-grade monoammonium phosphate compound fertilizer, and the filtrate is sent to the secondary neutralization tank; continue to add ammonia water in the secondary neutralization tank for neutralization, and stop the flow when the pH value of the slurry reaches 7.1 Ammonia, the secondary neutralization is completed and sent to the purification tank; in the purification tank, ammonium sulfide is added to the secondary neutralization slurry to stir and react. After passing the test, stop adding ammonium sulfide, filter and separate with a centrifuge, and filter cake m...
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