SU833925A1 - Method of producing nitroammonium phosphate - Google Patents

Description

one

This invention relates to a process for the preparation of a nitroammofoski, which can be used as a mineral fertilizer.

A known method for producing a nitroammofoski, including mixing phosphoric and nitric acids, neutralizing the mixture with gaseous ammonia, evaporating the resulting pulp, mixing it with potassium chloride, and granulating in the tower P-

However, in this method it is difficult to obtain a balanced fertilizer due to / incomplete dissolution of potassium chloride in the melt. In addition, the technological scheme is complex and requires large dimensions of the equipment.

The closest to the proposed technical essence and the achieved result is a method for producing nitroammofoski by neutralizing nitric and phosphoric acids with ammonia, displacing neutralization products with potassium chloride and subsequent granulating the product with its subsequent neutralization with ammonia.

The method is carried out as follows. Neutralization of nitric and phosphoric acids are separate. Pulp

they are mixed and fed to the ammonium boron granulator, where potassium chloride and ammonia gas are simultaneously introduced in an amount of 1.45-1.6% per ton of finished product.

The disadvantage of the method is that fertilizers are obtained, the caking of which exceeds 20%.

The purpose of the invention is to reduce the caking of the finished product while disposing of the waste products of water TV.

The goal is achieved

the proposed method, which are neutralized with ammonia nitric and phosphoric acids, the products of neutralization mixed with chloride. potassium and the resulting mixture is granulated and neutralized with ammonia, taken in an amount of 1.3-1.35% per ton of finished product, in the presence of phosphate sludge produced in hydrogen fluoride, taken in the amount of

0.5-2% per ton of finished product. Granulation and post-neutralization are carried out in an ammonizer-granulator.

The expediency of the selected process intervals is illustrated in

Claims (2)

the table. The introduction of phosphate sludge in an amount of more than 2.0% per ton of finished product is impractical, as it is in children to dilute the product. Example. 170 kg of phosphoric acid in terms of neutralizing 30 kg of ammonia to a molar ratio of NH: HzRO40.7. 310 kg of nitric acid neutralize 84 kg of ammonia. The resulting neutralization products are fed to the ammoniation granulator, where 29 € kg of chloride to hydrogen, 12.7 kg of ammonia and 5 kg of phosphate sludge are introduced at one time. At the outlet of the ammonium-granulator of the nitroammophosq, pH 1.04. The product is dried in a tumble dryer at an inlet gas temperature, 105 s at the outlet. The resulting product at a moisture content of 0.6% has caking 4.7%. Approximately 2. 170 kg of phosphoric acid in terms of RLow neutralize 30 kg of ammonia to a molar ratio of NH-j: HgPO4 0.7. 310 kg of nitric acid neutralize 84 kg of ammonia. The resulting neutralization products enter the ammoniation granulator, where 290 kg of potassium chloride 12.2 kg of ammonia and 10 kg of phosphate sludge are simultaneously introduced. The product is dried in a drying drum at the temperature of the gases at the inlet and at the outlet -. The resulting product has a caking of 2.5%. Froze 170 kg of phosphoric acid in terms of P O-neutralized 30 kg of ammonia to a molar ratio of 0.7. 310 kg of nitric acid neutralize 84 kg of ammonia. The resulting products of neutralization enter the ammoniation-granulator, where 290 kg of potassium chloride, 11.7 kg of ammonia and 20 kg of phosphate sludge are simultaneously fed. The product is dried in a tumble dryer at the gas temperature at the inlet, at the outlet -. The resulting product does not cake at a moisture content of 0.58%. The use of the proposed method allows to reduce the caking of the finished product from 23.6% to 0-10% and to use phosphate sludge - hydrogen fluoride production waste, containing 47% of two- and three-disposed ammonium phosphate. The method of obtaining nitroammofoski by neutralizing nitric and phosphoric acids with ammonia, mixing neutralization products with potassium chloride and subsequently granulating the product with simultaneous neutralization with ammonia, is also different in that, in order to reduce caking, while disposing of production wastes, it will use the background. lead in the presence of phosphate sludge production of hydrogen fluoride, and the amount of 0.5-2% per ton of finished product. Sources of information taken into account in the examination 1. V. Kochetkov. Complex fertilizer technologists. M., Himi, 1971, p. 67. 2. Chemical production. Collection. M., Knowledge, 1971, p. 67 (prototype).