System and method for producing high-content ammonium phosphate with wet process phosphoric acid containing sediment
Inactive Publication Date: 2015-02-18
GANSU WENGFU CHEM
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[0004] Another object of the present invention is to provide a method for producing qualified nutrient ammonium phosphate using the above-mentioned production system, which solves the problem of sediment treatment in the phosphoric acid clarification tank of a large-scale wet-process phosphoric acid system, and does not affect the production of 64% nutrient ammonium phosphate products at the same time
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[0042] Gansu Wengfu Co., Ltd. adopts the system of the present invention to produce 64% nutrient ammonium phosphate with sediment-containing phosphoric acid. The volume of the acid tank 8 in this system is 1100m 3 , The volume of acid storage tank 1 is 500m 3 , The volume of clarification tank 3 is 800m 3 ; The inlets of each pump are controlled by valves. Send the upper clarified phosphoric acid with a liquid level above 50% in the clarification tank 2 to the acid supply tank 8 for acid mixing with newly produced concentrated phosphoric acid to form a mixed acid, and send the mixed acid with a liquid level above 50% in the acid supply tank 8 to ammonium phosphate System 6 produces 64% of the nutrient ammonium phosphate.
[0043] The calculation method for acid preparation is: the solid content of the clarified phosphoric acid in the upper layer is ≤1.5%, and the specific gravity is 1.52g / cm 3 , the acid concentration is 41.5%; the solid content of the mixed acid after acid...
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The invention provides a system and a method for producing qualified-content ammonium phosphate with wet process phosphoric acid containing sediment. The system comprises an acid storage tank, a first centrifugal pump, a settling tank and a first slurry pump, which are sequentially connected, wherein the settling tank is connected with an acid supplying tank by a second centrifugal pump, the acid supplying tank is respectively connected with an acid conveying pump and a second slurry pump, the acid conveying pump is connected with an ammonium phosphate device, and the second slurry pump is connected with the acid storage tank. The method comprises the steps of: conveying phosphoric acid containing sediment in the acid supplying tank to the acid storage tank, then conveying to the settling tank for settling, conveying upper-layer clear phosphoric acid to the acid supplying tank to be mixed with newly produced concentrated phosphoric acid in the acid supplying tank to obtain a mixed acid, and conveying the mixed acid meeting the requirement to an ammonium phosphate system for producing high-content ammonium phosphate. The production system reasonably utilizes phosphoric acid containing sediment to produce ammonium phosphate with content of 64%, thereby providing a way for treating phosphoric acid sediment in the wet process phosphoric acid production process; and the created economic benefit per year is considerable, part of P2O5 is simultaneously recovered and secondary pollution is reduced.
Description
technical field [0001] The invention belongs to the technical field of chemical fertilizer production, and relates to a system for producing qualified nutrient ammonium phosphate, in particular to a system for producing high-nutrient ammonium phosphate with sediment-containing wet-process phosphoric acid; the invention also relates to a system for producing qualified nutrient ammonium phosphate by using the system Ammonium Phosphate method. Background technique [0002] Wet-process phosphoric acid is the main raw material for the production of monoammonium phosphate and diammonium phosphate. Since wet-process phosphoric acid is obtained by decomposing phosphate rock with concentrated sulfuric acid, which contains a large amount of insoluble matter and sediment, if it is not separated in time, it will have a great impact on product quality, and at the same time, the acid storage tank in the production system will produce " The phenomenon of "sitting tank" will generate depos...
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IPC IPC(8): C01B25/28
Inventor 高源张胜沈鹏宋方贵何永苍孙建荣
Owner GANSU WENGFU CHEM