SU1328340A1 - Method of producing superphosphate - Google Patents

Abstract

The invention relates to the technology of inorganic compounds, and specifically to methods for producing simple superphosphate, and can be used to simplify and reduce the cost of the process while increasing the degree of decomposition of phosphate raw materials in the production of fertilizers. In a thermostatted porcelain cup, 17.76 g of underground oil-well boring waters, 20 g of apatite and 10 g of Karatau phosphate are mixed. Stir for 1 min, then add 93.2 g of 75% sulfuric acid and continue stirring for another 6 min. Next, the porcelain cup with superphosphate mass is placed in oven O and kept for 1.5 h at 100 - 105 C. The resulting chamber superphosphate is crushed, cooled and analyzed for its moisture content and all forms of PjO by the standard method. In the chamber product, the main indicators are, wt.%: PjO, g 20.2; 18.37; P, 05, 18.05; .ZT; moisture 12.5; CRD 90.9; yield 1.87. 1 hp f-ly. S ate

Description

one . one

This invention relates to a technology of inorganic compounds, and specifically to methods for producing simple superphosphate.

The purpose of the invention is to simplify and cheapen the process while increasing the degree of decomposition of the phosphate raw material.

Example. A thermostatted porcelain cup with a capacity of 0.6 l equipped with a stirrer and previously weighed, 17.76 g are poured in underground water and apati-1 / y-mixture, which contains 90 g of apatite and 10 g of phosphate K aratau (ratio 5: 0.11), stirred for 1 minute, after which 93.2 g of 75% sulfuric acid are added (get 63% solution) and stirring is continued for another 6. Then the porcelain cup with superphosphate mass is placed in an oven and incubated for 1.5 hours at 100 - 105 ° C. The chamber superphosphate obtained is crushed, cooled ayut and analyzed for its content of moisture and any forms of the standard method. In the chamber product, the main indicators are, wt.%:, 0,2

18.05;

PaOscB

18.37; P-jOgBoA

9.37; moisture 12.5; yield 1.87.

PRI mme R 2. Decomposition

time

90.9

lead

as in Example 1, but 80 g of apatite and 20 g of Karatau phosphate (1: 0.25 ratio) are contained in the mixture of phosphate raw materials; they are mixed for 25 minutes from 25.3 g of ground water (concentration 59%). As a result, in the resulting product the main indicators are as follows, wt.%: PjOjoem 19.65; 7.0 18.00, 17.65; 9.09; moisture 15.2; Kr „, 91,6; yield 1.86.

EXAMPLE 3: Decomposition is carried out analogously to example 1, but 70 g of apatite and 30 g of Karatau phosphate (a ratio of 1: 0.43) are contained in a mixture of phosphate raw materials, which are mixed with 34 g of underground waters (concentration of 55%), as a result in the resulting product the main indicators are, wt.%: 19.; . 7L5; 17.0; PjOycB, 8.9; moisture 17.5, Kpaj. 91.3; yield 1.84.

Thus, when diluted with 75% sulfuric acid

The hydrochloric acid is formed with the water that contains the chlorides, which, due to its higher activity, immediately reacts with. apatite without the formation of a solid phase screening the surface of grains of phosphate raw materials.

Dilution of .75% sulfuric acid tower with industrial drilling water to a concentration of 55-63% is optimal, as follows from the experiments.

An increase in the concentration of sulfuric acid (more than 63%) is impractical because it reduces the amount of underground water to dilute the acid and the degree of decomposition of the phosphate raw material by reducing the amount of hydrochloric acid that is formed.

five

0

five

0

45

0

55

Reducing the concentration of sulfuric acid (less than 55%) is also impractical because it leads to an increase in the amount of underground industrial water to dilute the acid and increase the moisture content of the product and, consequently, deterioration of its physical properties. Pre-mixing. apatite with phosphate in the ratio of (70 - 90): (10 - 30), as a result of which the content of magnes in the reaction medium is 0.35 - 0.75%, it has a positive effect on decomposition.

A decrease in the amount of phosphate in the phosphate mixture (less than 10 May, h) leads to a decrease in the content of magnesium oxide in the reaction medium and a decrease in the degree of decomposition of the phosphate feedstock.

An increase in the amount of phosphate in the phosphate mixture (more than 30 May, h) is also impractical, since the product obtained does not comply with GOST,

Claims (2)

Invention Formula 1, A method for producing superphosphate, including decomposing phosphate with a mixture of sulfuric and hydrochloric acids, chamber aging of a product, characterized in that, in order to simplify and reduce the cost of the process while simultaneously increasing the degree of decomposition of phosphate raw materials, the mixture of apatite and phosphate is used as a source of phosphate raw materials at a mass ratio of 1: 313283404 : (0.11-0.43), and as a mixture of underground water having acids use tower sulfuric composition,%:. acid diluted with drilling water NaCl9,5 to a concentration of 55-63%. MgCl 1.36 2. The method of pop.1, otlicha.yu-5 NaBr0,075 u and with the fact that in. quality brown-Nal0,003 vk waters use neftehalinskiyevoda the rest