SU1560534A1 - Method of obtaining complex fertilizer - Google Patents

Abstract

The invention relates to methods for producing complex nitrogen-phosphorus fertilizer used for various agricultural crops, and increases the utilization rate of nitrogen and phosphorus fertilizer plants while maintaining the strength of the granules. According to the invention, the powdered waste from the production of urea-formaldehyde fertilizer (KFU) is mixed with the boiler dust using the waste water produced by the formaldehyde-containing solution in a mass ratio equal to 1: / 0.4-2.5 /: / 0.64-1.90 /, respectively. The resulting mass is granulated. According to the proposed method, a fertilizer is obtained with a nitrogen utilization ratio up to 75% and phosphorus up to 35% with a maximum strength of granules of 6.2 kg / granules. 2 tab.

Description

The invention relates to a method for producing a complex nitrogen-phosphate fertilizer used for various agricultural crops.

The aim of the invention is to increase the utilization rate of nitrogen and phosphorus fertilizer by plants while maintaining the strength of the granules.

Example 1. 40 g of dust from waste products from the production of urea-formaldehyde fertilizer (KFU) containing 41.0% of nitrogen are mixed with 16 g of cuttleted dust and 25.6 g of waste water containing 0.4% of nitrogen and 0.02% of formaldehyde. The ratio of dust KFU: kottrelna dust: waste water 1: 0.4: 0.64. The resulting mixture is granulated and dried.

The product yield of 56.1 g, the strength of the granules 3.7 kg / granule. Nitrogen utilization rate is 69%, phosphorus - 30%.

Composition of pottery dust, wt.%: K40 15.0; P405 50.7; CaO li, 0; MgO

3.95; Fe p3 0.2; A1g03 2.24 Pa. 1.0; B 0.1; SiO and impurities else.

The content in the product of nutrients, wt.%: N 32,71; 14.46; KgO 4.29; Mp 0.29; At 0.029.

The composition of the KFU dust, wt.%: Methylene diurea 60-70; trimethylenetetramine 15-20; urea free 10-15} high molecular weight compounds 10-15; total nitrogen 38.0-41.0.

In the wastewater produced by the formaldehyde-containing solution, 0.4-7.5% of total nitrogen and 0.02- 4.6% of formaldehyde are contained.

Example 2. 40 g of KFU dust containing 40.6% of nitrogen are mixed with 40 g of cottrel dust and 40 g of waste water containing 5.0% of nitrogen and 2.0% of formaldehyde. The ratio of dust KFU: cat trela dust: waste water 1: 1: 1., The resulting mixture is granulated and dried.

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The product yield 82.8 g, the strength of the granules 4.6 kg / granule. Nitrogen utilization rate 74%, phosphorus 34%

Composition of pottery dust, wt.%: PjOf 43.4; 12.7; CaO 10.9; MgO 2.6; , 0,2; A1203 2.2; Mp 0.7; B 0.03; SiO / 2 and impurities else.

The content in the product of nutrients, wt.%: N 22.03; 20.97; 6.14; Mp 0,34; In 0.039.

Example 3. 40 g of KFU dust containing 39.0% nitrogen are mixed with 100 g of cottrel dust and 76 g of waste water containing 7.5% nitrogen and 4.6% formaldehyde. The mixture is granulated and dried. The ratio of dust KFU: Kottrel on dust: waste water 1: 2.5: 1.90.

The product yield of 149.2 g, the strength of the granules of 3.3 kg / granule. Nitrogen utilization rate 72%, phosphorus 34%

Composition of pottery dust, wt%: Pr0505.1; K20 9.0; CaO 7.1; MgO 1.2 Fe703 0.15; A1403 1.23; Mp 0.5; B 0.05; SiO and impurities - the rest.

The content in the product of nutrients, weight,%: N 10,19; 23.53; K20 6.03; Mp 0,34; 3 0.034.

Example 4. 40 g of KFU dust containing 41% of nitrogen are mixed with 8 g of cottrel dust and 12 g of waste water of the composition of Example 1, the mixture is granulated and dried.

The ratio of dust KFU: kottrelna dust: waste water 1: 0,2: 0,3.

The product yield of 48.7 g, the strength of the granules of 1.6 kg / granule. Nitrogen utilization rate 55%, phosphorus 25%

The content in the product of nutrients, wt.%: N 34,3; .8.58; K40 2.5; Mp 0.17; In 0,017.

Example 5, 40 g of KFU dust containing 39.0% of nitrogen is mixed with 112 g of cottrel dust and 80 g of waste water of the composition according to Example 3. The mixture is granulated and dried. The ratio of dust KFU: kottrelna dust: waste water 1: 2.8: 2.0.

The product yield 162,5 g; granule strength 2.2 kg / granule.

Utilization factor is 59%, phosphorus is 23%.

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The content in the product of nutrients, wt.%: N 13,29; ,, 24,12; K20 6.20; Mp 0,34; In 0.034.

In tab. 1 shows a comparative characteristic of the known and proposed methods.

From tab. 1 it follows that the weight ratio of the dust of the KFU: the boiler dust: the waste water, equal to 1: (0.4-2.5) :( 0.64-1.9), is optimal, since there is a decrease outside the specified ratio utilization of nitrogen and phosphorus compared to their optimal values.

In tab. 2 shows the characteristics of the granules of the product obtained by the proposed and known methods;

From tab. 2 it follows that the proposed ratios of the starting components are optimal not only to increase the digestibility of the nutrient components of the fertilizer, but also to obtain durable granules of the product, which is important during its transportation and storage.

Thus, the proposed method allows to increase the utilization of nitrogen and phosphorus while maintaining the strength of the granules.

Claims (1)

Invention Formula A method of obtaining a complex fertilizer, comprising mixing a carbamide-containing component, a cut dust and a solution containing formaldehyde followed by granulation, which is aimed at increasing the utilization rate of nitrogen and phosphorus of the fertilizer by plants, while maintaining the strength of the granules, as a component containing urea, use powdered waste production of urea formaldehyde fertilizer (KFU), as formaldehyde containing solution - waste water of the same production in mass The ratio of - dust production KFU: Kottrelna dust: waste water 1: (0.4-2.5) :( 0.64-1.90). Table 1 The known method 0,73-1,04 0,25-0,31 The proposed method 0.73-1.04 0.25-0.31 60 60 23 table 2 23 7.6-7.9