RU1494480C - Method of production unconsolidated potash-cupric fertilizer - Google Patents

Abstract

The invention relates to a technology for producing mineral fertilizers and can be used in enterprises producing potash and other mineral fertilizers. The purpose of the invention is to reduce caking. hygroscopic and potable product The method is carried out by mixing fine-grained chlorine potassium having a temperature of 30 -, with copper sulfate in an amount of 10 - 5.5 wt. per 100 wt. KCl, followed by treatment with paraffin hydrocarbons in an amount of 0.5 - 5 kg / t and amines in an amount of 50 to 500 g / t. Fine-grained chloride potassium is a standard potash fertilizer. The grain size is greater than 0.88 mm 4.3%. the rest is less than 0.8 mm. the content of KC1 is 91.4%. Copper sulfate is a commercial product complying with GOST 4165-78. As paraffin hydrocarbons, liquid paraffins are used - a commercial product manufactured according to TU 38-10186-77. Amines are a mixture of higher aliphatic amines of the composition C-Cn. The technology of the proposed method is as follows. Fine-grained potassium chloride is mixed with dry copper sulfate in a drum mixer, and the temperature of KC1 should be 30 -. Then, paraffin hydrocarbons and amines in a predetermined quantity are uniformly fed onto a layer of potassium-copper fertilizer which can be used as a finished product.

Description

The invention relates to a technology for producing mineral fertilizers and can be used in enterprises producing potash and other mineral fertilizers.

An object of the invention is to reduce caking. hygroscopicity and product fumes.

 Cr1Co1 is carried out by mixing potassium chloride with a temperature of 30-80 ° C and copper sulphate in an amount of May 1.0-5.5. hours on May 100. h, KCI followed by treatment with paraffin hydrocarbons in an amount of 0.5-5 kg / t and amines in an amount of 50-500 g / t.

Fine-grained potassium chloride is a standard potash fertilizer. The grain size is greater than 0.88 mm, 4.3%, the rest is less than O, 8 mm, the content of KS191-4%. Copper sulfate is a commercial product that complies with GOST 4165-78. As paraffin hydrocarbons, liquid paraffins are used - a commercial product manufactured according to TU 38-10186-77. Amines are a mixture of higher aliphatic amines of the composition Cl6-C20.

, Technologists of the proposed method for

The key is as follows.

Fine-grained potassium chloride is mixed with dry copper sulfate in a drum mixer, and the KCI temperature should be 30-80 ° C. Then, paraffin hydrocarbons and amines in a predetermined amount are uniformly fed to a layer of potassium-copper fertilizer, which can be used as a finished product.

Example. 960 g of fine-grained potassium chloride, the temperature of which is 50 ° C, is mixed with 40 g of dry copper sulfate, which is May 4. including copper sulphate on May 100. h. KCI. The resulting mixture is treated with an anti-caking agent - paraffin hydrocarbons in an amount of 2 g and amines in an amount of 0.2 g. The product is used as a ready-made fertilizer.

Moisture absorption is determined by the gravimetric method at a relative humidity of 88%. Caking is determined by the crush strength of briquettes compressed at 55 ° C and a pressure of 0.8 kgf / cm. aged 12 hours under these conditions. The content of the dust fraction (0.1 mm) is determined by sieving the sample on sieves (GOST 21560.1-76).

The influence of technological processing parameters on the quality of the finished product is studied. The optimal amount of copper fluoride in relation to chloride chloride

0 5

0 5

0

5

0 45

50 55

The range is May 1.0-5.5. h on May 100. including KCI, because the content of copper sulfate is less than May 1. including worse. the agrochemical value (in terms of copper) of the fertilizer obtained, and an increase in the content of copper sulfate over 5.5 May, leads to a strong increase in its moisture absorption, i.e., hygroscopicity, which ultimately contributes to an increase in caking of the finished product, and also leads to excessive copper content and fertilizer.

The obtained results on the dependence of the amount of absorbed moisture on the content of copper sulfate in the fertilizer are presented in Table 1.

As can be seen from the table. 2, which shows the temperature dependence of the content of crystallization water in CuS04 5H20 at a temperature of 80 ° C, 2 mol of crystallization water is removed from copper sulfate (CuS04 5H20), and at 90 ° C and above, the release of crystallization water sharply increases. At elevated temperatures, crystallization water, which is part of copper sulfate, can transfer from vitriol to the KCI-CuSO system with the formation of a potassium-copper fertilizer with a water-salt complex on the grain surface. As a result of the diffusion of the water-salt complex into the particle contact zone and the subsequent evaporation of moisture, phase contacts arise, which leads to fertilizer caking. As the KCI temperature decreases below 30 ° C, the distribution of the mixture of paraffinic hydrocarbons and amines on the surface of potassium chloride deteriorates, which leads to an increase in caking of the product. In addition, long-term cooling of the KCI is required.

When treating potassium-copper fertilizer with paraffin hydrocarbons and amines, the use of paraffin hydrocarbons in an amount of less than 1 kg / t, and amines of less than 50 g / t does not provide complete surface treatment of the fertilizer and effective protection against atmospheric moisture. The introduction of paraffin hydrocarbons in an amount of more than 5 kg / t, and amines in an amount of more than 500 g / t does not lead to an additional increase in the effectiveness of the additive and is not economically feasible.

In the table. Figure 3 shows the effect of treatment of potassium-copper fertilizer with copper sulphate on May 4. hours on May 100. including KCI with paraffin hydrocarbons and amines for fertilizer quality.

As can be seen from the table. 3, processing a mixture of copper sulfate and potassium chloride, having Continuation of the table. 2

Table 3

oiuero, a temperature of 30-80 ° C, paraffin hydrocarbons and amines in an amount of 0.5-5 kg / t and 50-500 g / t, respectively, makes it possible to obtain non-caking potassium-copper fertilizer. The use of paraffin hydrocarbons and amines in the proposed amounts allows to reduce the caking of potassium-copper fertilizer by 2.0-3.3 times compared with the prototype and by 1.5-2.0 times compared with capyphosphate fertilizer without treatment anti-caking agent, as well as reduce the content of pulverulent fractions in fine-grained potassium-copper fertilizer by more than 10 times.

Thus, potassium-copper fertilizer obtained by the proposed method by mixing fine-grained potassium chloride with copper sulfate in dry form (temperature KS 30-80 ° C), followed by treatment with paraffin hydrocarbons with amines, is characterized by high quality indicators

(decrease in caking. hygroscopicity, dustiness). This reduces the loss of fertilizer and improves the sanitary and hygienic conditions of work during loading and unloading.

The potassium-copper fertilizer obtained by the proposed method is also characterized by high agrochemical value. When used on soddy-podzolic soils, the average yield increase of cereal crops is 3.1, on peat and bog soils - 5, 4. perennial grasses 9.6–13.0 kg / ha. (56) Copyright certificate of the USSR Mg521243. class C05D 1/02, 1973

Table 1

T a 5 l m L a 2

.1.2

, ..., .- J

Continuation of the table. 3