SU1608175A1 - Method of producing complex fertilizers - Google Patents

Abstract

The invention relates to a method for producing complex fertilizers containing magnesium and trace elements in water-soluble form and contributes to improving the quality of the product by reducing the content of water-insoluble magnesium salts in it. According to the invention, ammoniated acids are pre-mixed with a solution of potassium salt, and mixing with solutions of magnesium salts and trace elements is carried out at the time of granulating and drying the mixture at 90-100 ° C, humidity 0.5-2% for 15-20 minutes. According to the proposed method, a fertilizer containing magnesium in a water-soluble form is obtained. 4 tab.

Description

This invention relates to a process for the preparation of complex fertilizers containing magnesium and trace elements in water-soluble form.

The aim of the invention is to improve the quality of the product by reducing the content of water-insoluble magnesium salts in it.

Example 1. 51 kg of phosphoric acid concentration of 22%. With 42 kg of nitric acid concentration, and 47% HNQ, a1-1 monizirpot gaseous ammonia to pH 5, add 56 kg of potash solution with a concentration of 60%. In 30 kg. A 10% solution of salts of microelements (B, Cu, Mn, Zti, Mo) was introduced with 21 kg of magnesium sulfate.

Ammonized pulp with potassium is sprayed over the fluidized bed of product granules, and the solution of trace elements salts and magnesium is sprayed

in the fluidized bed, purged with flue gases. The pulp and the solution are evenly distributed over the surface of the granules while removing moisture. In a continuous process with a moisture content of a granule layer of 1%, a temperature of 95 ° C, and a material residence time of 17 minutes in it, 100 kg of product containing 0.2% insoluble residue is obtained.

Examples 2 and 3, Carry out the preparation of a product similar to py 1, but nppi different process parameters. Research Studies. are summarized in table. 13.,

As can be seen from table 1 - 3, the required content of water-insoluble magnesium salts in the fertilizer (less than 1%). at a given content of WgO (14%) in the product is achieved at a moisture

H

SP

0.5 - 2%, mixing time 15 - 20 minutes and a temperature of 90 - SO.S.

Data on the quality of the product obtained by the proposed and known methods are presented in table 4.

Invention Form

The method of obtaining complex convenience. Q rhenium, which includes the mixing of ammoniated acids with solutions of potassium, magnesium and trace elements with 1608175

The following granulation and drying of the product, characterized in that, in order to improve product quality by reducing the content of water-insoluble magnesium salts in it, ammoniated acids are pre-mixed with a potassium salt solution, and mixing with a solution of magnesium salts and trace elements is carried out at the time of granulation and drying mixture at 90 -, humidity 0.5 - 2% for 15-20 minutes.

Table 1

4t Mixing time 17 min, temperature Humidity when mixing 1%, temperature 95 C. Temperature 95 ° C.

Mixing temperature

85

90

95

100

105

Mixing time 17 min, humidity 1.0%.

Table 2

Table 3

The content of water-insoluble magnesium compounds in the product,%

1.0

0.20

0.20

0.25

1.5

MgO

common

water soluble

water insoluble

Fractions 1-4

4 3.8

0.2 0.7 95

Claims (1)

Claim A method of producing complex fertilizers, comprising mixing ammoniated acids with solutions of potassium, magnesium salts and trace elements, followed by granulating and drying the product, characterized in that, in order to improve the quality of the product by reducing the content of water-insoluble magnesium salts in it, the ammoniated acids are pre-mixed with potassium salt solution, and mixing with a solution of magnesium salts and trace elements is carried out at the time of granulation and drying of the mixture at 90 - 100 ° C, humidity of 0.5 - 2% for 15-20 minutes. Table 1 Humidity when mixing,% The content of water-insoluble salts of magnesium in the product,% 20 0.3 0.20 0.5 0.20 1,0 0.20> 5 2.0 0.25 2,5 1,0. Mixing time 17 min, temperature 95 ° C. Table 2 Mixing Time Water- ny, min soluble magnesium compounds in the product,% 12 1,0 fifteen 0.25 17 0.20 20 0.25 22 1,5 JL, Humidity when mixing 1%, temperature 95 C. Table 3 Mixing temperature, ^and C. The content of water-insoluble magnesium compounds in the product,% 85 . 1,0 90 0.20 95 0.20 100 0.25 105 1,5 * Mixing time 17 min, humidity 1.0% 1608,175 6 Table4 Substance The content of substances,%, in the product obtained by the method Famous Proposed N 16 16 p ₂ about ₅ 16 16 to ₂ o 16 16 MgO common 4 4 'water- rome s oh 3.8 non-water thief 1,0 0.2 H ₂ 0 0.7 • 0.7 Fraction 1-4 95 95