SU912723A1 - Process for producing liquid manganese-containing nitrogen-polyphosphoric fertilizer - Google Patents

Description

one

This invention relates to methods for producing liquid fertilizers by ammoniation of superphosphoric acid, which contain manganese in water-soluble form.

A known method of producing manganese-containing liquid nitrogen-polyphosphate fertilizers, which consists in adding manganese salt (sulfate, nitrate, manganese chloride) and citric acid or its soluble salt in 0.5-1.5 to liquid fertilizer obtained from superphosphoric acid. mole per mole of trace element.

The disadvantage of this method of obtaining manganese-containing liquid fertilizers is the use of expensive salts of manganese and citric acid or its water-soluble salts.

The closest to the invention to the technical essence and the achieved result is a method for producing a manganese-containing liquid nitrogen-polyphosphate fertilizer, which consists in dissolving thermal superphosphoric acid (76-77 Pj Ob) at, With a compound of manganese (MPC, MPO, MnjO ), which is then amnized at U8.8 C - 270 C in a closed reactor at a pressure of 0.0770 and then the resulting alloy

10 ammonium polyphosphates are dissolved in water and further neutralized with ammonia 12.

Claims (2)

The disadvantage of this method is a low content of water solids of manganese rooted compounds (up to 0.1%), and in the presence of a larger amount of impurities of iron and aluminum oxides in the starting acid, the formation of a large amount (up to 20%) of water insoluble and citrate insoluble compounds in which phosphorus is is invoked in an indigestible plant form. 3 The purpose of the invention is to eliminate the deficiencies and use of acids with a high content of impurities of iron and aluminum oxides while increasing the content of water-soluble manganese compounds. The goal is achieved by the method of obtaining manganese-containing liquid nitrogen-polyphosphate fertilizer, which includes preliminary dissolution in superphosphoric manganese acid, followed by ammonization of the resulting mixture with gaseous ammonia at elevated temperatures, radionuclide in water and donor neutralization with ammonia, merganzeate ore is used as manganese compounds and ammoniation is carried out at a mass ratio of N; P, 20, 3, temperature 230-370 C and contact time from 8 to 2 minutes. The content of soluble manganese compounds is the product is 0.3-1. Increasing the temperature above 37 ° C and contact time more than 2 minutes causes an increased formation of water-insoluble compounds. At a temperature below and contact time less than 8 s. possession eat orthophosphate. An increase in the mass ratio above 0.3 is impractical by economic KIM considerations, and when N: PjOs decrease below 0.2, acidic melts are formed (pH 1-2), in which the rate of formation of water-insoluble compounds is higher than in neutralized ones. Note-er1. 82 kg of superphosphoric acid (CPA), containing,%: Ra Ob 72; Pr Od-poly 25; , A1a04 3i, 5-,, 9-, SBO, 3, is dissolved at 9 g of manganese ore of the first grade of the Nikopol deposit. The dissolution is carried out with stirring for 90 minutes. The content of manganese in ore Ts3% - In the resulting solution, the manganese content is 1%. In the continuous reactor, in which the temperature is maintained, the resulting solution of manganese ore is fed into the SPC O, 53 kg / h and gaseous ammonia 0.0935 kg / h. Mass ratio N:, 0.2, contact time 2 min. The alloy leaving the reactor, mixed with water vapor and ammonia 3, is fed to the neutralizer reactor, where 0.90 kg / h of distilled water and ammonia gas 0.0–9 kg / h are continuously supplied. 1, b7 kg / h of liquid fertilizer containing wt.%: N 8, Pa, Mp f1.3 water insoluble compounds (ANS) O, are continuously withdrawn from the reactor of the neutralizer. The degree of conversion of orthophosphate K - 61%, pH 6.5 Example 2. V2kg SFK ,. containing 6B% Pr Oj dissolved at iSCfC 100 g of manganese ore with a manganese content of 3%. The dissolution is carried out with stirring over 90 mc. In the resulting solution, the manganese content is 2%. In the continuous reactor, in which the temperature is maintained at 230 ° C, the resulting solution of manganese ore is fed to the SFK 8 kg / h and gaseous ammonia in the amount of 2.1 kg / h. The mass ratio is N-P2 050.3, the contact time is 8 s. The alloy leaving the reactor in a mixture with water and ammonia vapors enters the neutralizing reactor, where 6.84 kg / h of distilled water is continuously supplied, in which the alloy is dissolved with stirring and 50-60 ° C. From the neutralizing reactor, 16.9 kg / h of liquid fertilizer containing wt .: N 10, PaO3; , 9 .VNS 0.3. ; The degree of conversion of orthophosphates is K 5b, pH 7. EXAMPLE 3. Dissolve in 38 g of manganese ore from Chiatura deposit with a manganese content of 55 g dissolved in 2 kg of SPC. The dissolution is carried out for 2 hours with stirring . Manganese content in SFK II. In the continuous reactor, in which the temperature is maintained, the resulting solution of manganese ore is fed into the SPC of 0.53t kg / centner and gaseous ammonia, 0.131 kg / h, mass ratio N: Pg05 0.3, contact time 2 min. The alloy leaving the ammonization reactor in a mixture with water and ammonia vapors enters the neutralization reactor, where 0.316 kg / h of distilled water is continuously fed, in which the alloy is dissolved with stirring and 50-bOS. 0.98 kg / h of liquid fertilizer containing wt.% Is continuously withdrawn from the neutralizer reactor: N 11-R RAM; Mn 0, S outside Oh ,. The degree of conversion of orthophosphates is K 66%, pH 7 n p and me R U. In 2 kg of SPC containing 72% Pr Oj is dissolved at 180 C, 77 g of manganese ore with a manganese content of 55. Dissolution is carried out for 2 hours at stirring. Manganese content in SFA 2%. In a continuous reactor, in which the temperature is maintained at 260 ° C, a solution of manganese ore is fed into the SFK 8 kg / h and ammonia gas, 2.1 kg / h. The mass ratio of N: f 05 0.3, the contact time is 8 s. The alloy leaving the ammonization reactor mixed with napaNW of water and ammonia is fed to a neutralizing reactor, to which 6.8 kg / h of distilled water is continuously fed, in which the alloy is dissolved with stirring and 50-60 ° C. 16.9 kg / h of liquid fertilizer containing wt.% ..N lOj PfOg Mp 0, out of 0.2 was continuously withdrawn from the neutralizer reactor. The degree of conversion of orthophosphate K 59%, pH 6.8. The use of the invention makes it possible to use manganese ores as a manganese-containing raw material instead of manganese sulphate and superphosphoric acid containing impurities of aluminum and iron oxides, while increasing the 3 content of water-soluble manganese. The method of obtaining a manganese-containing liquid nitrogen-polyphosphate fertilizer, including (preliminary dissolution in superphosphoric acid: manganese compounds, followed by ammoniation of the mixture with ammonia gas at elevated temperature, dissolving the resulting alloy in water and neutralizing with ammonia, was treated with an ammonia gas at elevated temperature, dissolving the resulting alloy in water and neutralizing with ammonia gas, and removing the mixture with ammonia gas at elevated temperature. in order to provide the possibility of using acid with a high content of impurities of iron oxides and aluminum while simultaneously increasing the content of water Pure manganese compounds, manganese ore is used as manganese compounds and ammoniation is carried out at a Mays ratio of 0.2-0.3, a temperature of 230-270С and contact time from 8 s to 2 min. Sources of information taken into account in the examination 1. U.S. Patent No. 3798020, Cl. C 05 D 9/02, 1979., 2. US patent tf, cl. 71-1, 1977 (prototype).