SU916510A1 - Process for producing manganese-containing granulated superphosphate - Google Patents

Description

The invention relates to the production of manganese-containing phosphate fertilizers for agriculture using the equipment of existing superphosphate plants.

A method of obtaining manganese-containing granular superphosphate by decomposition of phosphate raw materials with sulfuric acid.

In the resulting simple superphosphate enter 10-15% manganese concentrate containing 35-40% manganese 11].

The disadvantages of this method are ⁹ 'that manganese is in fertilizer in the form of pyrolusite insoluble in water - manganese dioxide MpO ₃ and the final degree of decomposition of apatite in the finished product does not exceed 85-88%. ¹⁵

The purpose of the invention is to increase the degree of decomposition of phosphate raw materials and enrichment of superphosphate with water-soluble forms of manganese.

This goal is achieved by the fact that in the well-known method of obtaining manganese-containing * granulated superphosphate, including the decomposition of sulfuric phosphate raw materials

2

acid and the introduction of the manganese-containing product into the resulting superphosphate, the manganese-containing product is used in the form of a manganese hydrochloric acid solution and injected into the superphosphate pulp at the time of decomposition of the phosphate raw material at a ratio of superphosphate pulp and manganese-containing solution 1: (0.48-0.63).

It is advisable to obtain a manganese-containing solution by decomposition of manganese ore with abgasic hydrochloric acid with a concentration of 20-30% in an amount of 105-110% of stoichiometry.

When manganese ores are decomposed by abgasic hydrochloric acid, active salts are obtained, which accelerate the consumption of unreacted phosphates, which makes it possible to shorten the storage period of the fertilizer.

Example 1. In a reactor with a capacity of 0.6—

1 l is placed 100 g of 68% waste sulfuric acid (from the production of ethyl alcohol and plant SK), heated to 60-65 ° C and gradually pour 100 g of apatite concentrate of standard composition. Then to semi3 7 \ ·. ··, * Λΐ651Ο

four

When mixing, the manganese-containing solution is added to the pulp, obtained as follows: into the reactor with a capacity of 0.3—

0.5 l was placed 90 g of 20% strength hydrochloric acid abgaenoy, it was heated to 30-35 ° C and dissolves ₃ dissolved therein 37 g of manganese ore and ssleduyuschego composition obtained solution (including undissolved residue)%:

MPS1 ₂ 11.0; MdS1 ₂ 3.60; ReS1 ₃ 2.6; CaCl ₂ 1.2; HC1 16; MpO 3.40; A1Cl ₃ 1.5; H ₂ O ₃ 25.20; , ₀

H ₂ O 37.1.

The ratio of superphosphate pulp and manganese-containing solution is 1: 0.63.

The thick pasty mass is stirred for 10 minutes and the reactor is placed in a thermostat at 105-110 ° C for 2 hours. Then the product is removed from the thermostat, cooled, the free acidity is neutralized with limestone, the product is granulated and dried. Received by

15

wt.%: P ₂ O ₅ ΡιΟ ₅

necessary for the decomposition of manganese ore. In this connection, the amount and volume of the manganese-containing solution are reduced and, consequently, the ratio of the manganese-containing solution and the superphosphate pulp changes.

Thus, in the proposed method, the ratio of manganese-containing solution and superphosphate pulp is selected in accordance with the concentration and amount of abgas hydrochloric acid required for the decomposition of manganese ore.

The degree of decomposition of phosphates in the finished product is 95-96%.

The application of the proposed method allows you to fully translate manganese in a water-soluble form and, consequently, to improve the quality of phosphate-manganese fertilizer; accelerate the decomposition of phosphates and reduce the period of storage maturation of fertilizer; increase the degree of decomposition of phosphate raw materials to 96%; to solve the problem and expand the use of hydrochloric acid in the production of fertilizers

Claims (2)

Claim 1. A method of producing a manganese-containing granular superphosphate, which includes decomposing the phosphate raw material with sulfuric acid and introducing the manganese-containing product into the resulting superphosphate, which, in order to increase the degree of decomposition of the phosphate raw material and enrich the superphosphate with water-soluble forms of manganese, use the manganese-containing product as a mixture and decompose the phosphate raw material into the superphosphate. and injected into the superphosphate pulp at the time of decomposition of phosphate raw materials at a ratio of superphosphate pulp and manganese-containing solution 1: (0.48-0.63). 2. The way pop. 1, characterized in that a manganese-containing solution is obtained by decomposing manganese ore with abhaen hydrochloric acid with a concentration of 20-30% in an amount of 105-110% of stoichiometry.