SU1699985A1 - Method of producing manganese-containing granulated superphosphate - Google Patents

Abstract

The invention relates to the production of mineral fertilizers with manganese additives. The aim of the invention is to increase the stability of the water and citrate soluble forms. in the product during its storage with a manganese content of more than 0.5%. The goal is achieved by the method of obtaining a manganese-containing granulated superphosphate by reacting the phosphate raw material with sulfuric acid followed by the introduction of the manganese-containing reagent as a manganese-containing reagent using a sulfur-manganese-aqueous suspension (CMRC) with a mass ratio of 1 ml: 1.2: , 8-- 1.9), which is introduced into the superphosphate wetting step. In so doing, the super manganese aqueous suspension is obtained by mixing superphosphate and manganese sludge. 2 tab. KO

Description

The invention relates to the production of mineral fertilizers with the addition of manganese by the interaction of phosphate raw materials with sulfuric acid followed by the introduction of manganese-containing reagent.

The purpose of the invention is to increase the stability of water and citrate-soluble forms in the product during its storage with a manganese content of more than 0.5% ..

Example: In 100 ml of water, the dust of superphosphate and manganese sludge is dissolved at a mass ratio of P2. ° 6cso6: Mn, 8. The resulting aqueous suspension is fed to the stage of moistening the matured superphosphate composition,%: s & 7-9, 5; P205 waters

P „ps

7-12,5.

18-19; Rgp5TsITr 19-20,2 Pr / ChORTS19,921, 0; fluorine 1, 1-1 .2, Ngg

Moisturizing is carried out to a moisture content of 16% while simultaneously pelleting in granules. The resulting infrastructures are dried to a p: Agi content of 3.3–3.5%, classified and cooled. The resulting product contains, May .: Pr 5 5C 19,5; R2Cheod 18.5; Р205Сео6 2,5; Y 3,4; Mn0 (5C 1.06; Mn water 1.0.

These data indicate that it is possible to ensure the stability of the water-citrate-soluble form of PjjOt with granulated superfossbate with manganese additives more than 0.5 during long-term storage compared with the known methods for producing granulated superphosphate with manganese additives.

The substantiation of the parameters, ЕSH.CHOLASHI over the boundary conditions, is presented by ВТ) 6и. 1 and 2.

for

Q

with

CD 00

ate

3169

As follows from the table. I, the introduction of manganese at the stage of moistening in the form of a suspension ensures the stability of the water-and citrate-soluble form of 2Og for 6 months. At the same time, the content of manganese can be varied within wide limits; both below 0.5% and above.

As can be seen from the table. 1, the ratio is expediently varied within 1.2: (6.80-1 1.90). An increase in this ratio leads to a decrease in the water-and citrate-soluble form of PЈ (and a reduction, although not resulting in a decrease in the water-and citrate-soluble form, but the manganese content in the product is lower than 0.5%.

From tab. 2, it can be seen that the fertilizer obtained retains the physicochemical characteristics of the product.

Manganese sludge is a waste product of the production of electrolytic manganese dioxide and has the following compound,%: MnOg 6-6,0; MPO 23-24; SiOz 28.2-29.5; MnSO 9-10; HgO the rest.

Thus, the proposed method ensures the stability of water and

nitrate-soluble forms of long-term storage of the product, intensifies the process of granulating superphosphate and improves the agrochemical efficiency of fertilizers.

Formula of invention

The method of obtaining manganese-containing granulated superphosphate, including the decomposition of phosphate raw materials with sulfuric acid, the introduction of manganese-containing reagent, granulation and drying of the finished product, in order to increase the stability of water-soluble and citrate-soluble forms in the product manganese content of more than 0.5% during its storage, as the manganese-containing reagent use an aqueous suspension obtained by mixing superphosphate with manganese sludge - waste electrolytic production of dioxide manganese at a mass ratio of FrG5S8ob: Mn:: (6.8-11.9), while the manganese-containing reagent is introduced into the granulation stage.

Table 1

1.2: 1.7

1.2: 4.25

1.2: 6.8

1.2: 9.35

1.2: 11.90

1.2: 14.45

18.7 18.5 18.3 18.1 18.0 17.4 17.1 17.6 1 / .0

sg -c .c

Claims (1)

Claim A method of producing a manganese-containing granular superphosphate, including the decomposition of phosphate raw materials with sulfuric acid, the introduction of a manganese-containing reagent, granulation and drying of the finished product, characterized in that, in order to increase the stability of aqueous citrate-soluble forms of P ^ O ^ - ^{in a} product with a manganese content of more than 0, 5% during its storage, an aqueous suspension is used as a manganese-containing reagent obtained by mixing superphosphate with manganese sludge, a waste product of electrolytic dioxide production manganese at a weight ratio (6,8-11,9), wherein the manganese-containing reagent is introduced in the granulation step.