SU424849A1 - METHOD FOR OBTAINING AMMOPIUM PHOSPHATES, * f: 'd g-' •• ^ '•, •,. R ^ -: '' • | F1> &1Д;. . '. Mi .; i •: ^ J - Google Patents

Description

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This invention relates to methods for producing ammonium phosphates by ammopization of phosphoric acid by ammonia-containing components.

A method is known for producing ammonium phosphates by ammopization of oryphosphoric acid extracted with organic solvents from its aqueous solutions, for example, with an alcohol mixture, with ammonia gas in the presence of a strong solution of ammonium phosphate.

However, various insoluble organic matter and an aqueous solution of an organic compound compound with ammonia are formed, which must be periodically removed from the system. In addition, according to this method it is possible to obtain only diammonium phosphate.

The rare method differs from the known one in that ammonization is carried out with ammonium salts of phosphoric acid, for example, diammonium phosphate.

This method allows to obtain monoammonium phosphate, increase the yield of solid salt and improve the quality of the obtained product.

Example 1. Phosphoric acid (PzRO4), obtained from decomposition of apatite concentrate with sulfuric acid, is extracted with a solution of tripot-7i-butyl phosphate (TBP) in kerosene.

Saturated 75 vol.% TBP in kerosene containing 6.33% P2O5, treated with 36.5%

solution of diammonium phosphate (DAP) with a weight ratio of the organic phase of TBP and aqueous solution of DAP-3.1 / 1. As a result of the interaction, 0.139 kg / kg of the organic phase of the solid (including 0.105 kg /, kg of the organic phase of solid MAF directly from the organic phase) containing 60.2% of PgOz and 16.1% of Nz and 0.248 kg / kg of the organic phase of uterine the solution

containing 17.4% PaOs. The pH is between 3 and 3.5.

The mother liquor is treated with ammonia and converted into diammonium phosphate with an RP of 8.5-8.8, which is the reverse of the process. When precipitations are precipitated from ammonization solutions, they are removed by limestone methods.

Example 2. 1 kg of apatite concentrate is dissolved in 24% hydrochloric acid (HC1 consumption 70% by weight). A solution of phosphoric acid containing 9.15% of PjOs is obtained. As a result of the countercurrent extraction of HzRO4 75% TBP in kerosene, an extract containing 6.4% PAOD was obtained. When re-erecting 36.9% solution of diammonium phosphate (pH 8) with a weight ratio of organic water-3; 1, a solid salt was obtained with a yield of 134%, containing 60% P205, 15% Of, and a 21.6% solution of monoammonium phosphate (pH 2.6). 3 Example 3. 1 kg of Karatau phosphorite is dissolved in 45% nitric acid (consumption of HNOs 1-15%). A solution of production phosphoric acid containing 6.4% P2O5 is obtained. A counter-current extraction with butyl alcohol 5 gave an extract containing 4.6% P205. With the Stripping of 36.9% -NY | M with a solution of diammonium phosphate (RP 8) with a weight ratio of organic aqueous of 3.36: 1, a solid salt was obtained with a yield of 102.5%, containing 60.5% of P2O5, 14.9 % NS, and 25.9% solution of monoammonium phosphate (pH 3.5). 4 Subject of the invention. A method for producing ammonium phosphates by ammonization of orthophosphoric acid extracted with organic solvents from its aqueous solutions, characterized in that ammonia salts of phosphoric acid are produced by ammonium phosphate to increase the yield of solid sun and improve the quality of the product, for example diammonium phosphate.