RU1819878C - Process for preparing organomineral fertilizer - Google Patents

Abstract

The invention relates to the production of organophosphorus fertilizers with trace elements and biologically active substances. SUBSTANCE: phosphate feedstock is mixed with a biological additive (activated sludge), the resulting mixture is decomposed with phosphoric acid, which is introduced in an amount providing the ratio of P20s acid: bioadditive (0.63-0.91): 1. The decomposition product is granulated and dried.

Description

The invention relates to the production of organomineral fertilizers with trace elements and biologically active substances and can be used in the production of organophosphorus fertilizers with additives.

The aim of the invention is to increase the content of lemon-soluble form of PzOs in the finished product and to increase the yield of the finished product. The goal is achieved in a method for producing organophosphorus fertilizer, comprising mixing phosphorite flour with bioorganic substances and phosphorus compounds, followed by granulation and drying of the product, so that bioamass - a waste product of protein-vitamin concentrate production - is used as a bioorganic substance. phosphoric acid is taken as the phosphorus-containing compound at the ratio of PzOs acid: biomass (0.63-0.91): 1. The essence of the method is as follows. that the bioactive additive (microbial biomass, activated sludge) is hydrolyzed in phosphoric acid to form amino acids involved in the decomposition of phosphorus raw materials, while the additive has a flotating effect on phosphate raw materials, which improves mass transfer conditions and increases the content of lemon-soluble form of PaOs. In addition, the resulting complexes of trace elements metals with amino acids give the pulp good binding properties (viscosity, density), this contributes to the adhesion of particles during granulation and densification of the structure of formed granules, which leads to a high yield of product fraction. However, the amount of amino acids in the pulp must be strictly defined, i.e. with their excess, the pulp becomes less viscous and more acidic, and granulation with such a pulp leads to a decrease in the yield of the product. It is necessary to take a strictly defined (and much smaller) amount of phosphoric acid in relation to the bioadditive.

The appropriateness of the selected process intervals is proved by the data in Tables 1 and 2.

(L

Yu

00 XI

with

As follows from the data of Table 1, with a decrease in the proportion of phosphoric acid in the system, the free acidity of the product decreases, and the ratio of 0.91: 1 or less is optimal.

From the data in Table 2, it can be seen that with a decrease in the proportion of phosphoric acid, the product is being enlarged, the optimum ratio of P20s acid: bioadditive providing the goal is the range (0.63-0.91): 1.

EXAMPLE 1. Biomass in an amount of 200 kg and phosphorite flour in an amount of 284 kg are decomposed by extraction phosphoric acid, taken in an amount of 650 kg, which corresponds to a ratio of 0.91: 1, for 2 hours at 70 ° C. The resulting pulp is granulated and dried at 100 ° C.

The resulting product containing PaOs lemon-soluble 21.8% PsOg svob. 4.2%, has the following fractional composition:

-4+ 1 99

-nineteen

EXAMPLE 2. Biomass in an amount of 200 kg and phosphorite flour in an amount of 320 kg are decomposed by extraction phosphoric acid, taken in an amount of 500 kg, which corresponds to a ratio of 0.7: 1, the resulting pulp is granulated in a BHS apparatus at 80 ° C. After drying, the product contained lemon-soluble PaOe 20%, PaOs assimilated 2.5% and had a fractional composition:

+ 4-4 + 1 -1

294 4

EXAMPLE 3. Biomass in an amount of 200 kg and phosphorite flour in an amount of 288 kg are decomposed by extraction phosphoric acid, taken in an amount of 450 kg, which corresponds to a ratio of 0.63: 1, the obtained pulp is granulated in a BHS apparatus at 90 ° C. After drying, the product contained PaOs lemon-soluble 20% digestible 2.3% and had a friction composition:

-4 + 1 89

-1

ABOUT

Using the proposed method will increase the content of PrOb limonosoluble from 3.37% of the prototype to 20-23% (55-60% of total phosphorus) and increase the yield of commercial fraction (granules with a size of -4 + 1 mm from 30% to 89-94 %).

Claims (1)

Claims A method for producing an organic mineral fertilizer, comprising mixing a biologically active additive with phosphorite flour, molding and drying, characterized in that, in order to improve the quality of the product by reducing its acidity and increasing the yield of the commercial fraction, activated sludge is used as a biologically active additive, and the resulting mixture of phosphate rock and activated sludge is injected with phosphoric acid in an amount providing a ratio of PaOs acid to activated sludge 0: 63-0.91: 1. The dependence of the free acidity of the finished product on the ratio of RaOb acid: dietary supplement Table 1 The yield of product fraction in the product after drying, depending on the ratio of P20s acid: bioadditive table 2