SU467050A1 - The method of obtaining complex suspended fertilizers - Google Patents

Description

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The invention relates to the field of producing complex suspended fertilizers.

Various methods are known for producing complex N-P-K suspended fertilizers based on urea, ammonium phosphate and potassium salts. As a suspending agent, activated sludge or sulphite liquors are used, as well as bentonite or attapulgite, alone or in a mixture.

There is also known a method for producing complex suspended fertilizers based on urea, ammonium phosphate, and alkali metal salts in the form of sulfates, chlorides, and nitrates by intensively displacing them, followed by adding to the resulting mixture water and suspending agents in the form of an aliphatic Ci-Sat organic acid to produce thixochropic gel.

The disadvantages of this method are the need to use deficient potassium salts, the high temperature range of suspension preparation and the specificity of the quantitative composition of the mixture of nutrient salts, which, in case of violation, leads to deterioration of the physical indicators of the suspension.

According to the proposed method, potassium hypophosphite is used as the alkali metal salt, which is shifted with sodium or ammonium hypophosphite, followed by saturation with the resulting mixture of an aqueous solution of the suspending agent.

It is advisable to use potassium, sodium or ammonium hypophosphite in a mixture with potassium metaphosphate.

Such an embodiment of the method makes it possible to bring the amount of nutrient salts in the fertilizer above 60% and to extend the range of nutrient salts. So in the obtained N-P-K suspended suspended fertilizer, the amount of nutrients reaches more than 60%, with all other equal quality indicators of the suspension and using any (organic or inorganic) additives without

pre-processing. Example 1. A solution of a suspending agent in water is prepared. To do this, 3 g of colloidal clay is shifted from 30 g of water. The prepared solution is heated and 67 g of a mixture of salts: NH4H2PO4, (MH4) 2PR04, CO (NH2) 2, NaGROg and KNgROz with a ratio of N: P2Os: K2O I: 6: 3 is dissolved in it under continuous movement. A liquid is suspended

fertilizer with a total nutrient content of 62%. The fertilizer does not change its consistency and lasts good for 3-4 weeks.

Example 2. Preparing a solution of suspending agent in water (as in Example 1) of 5 g

(B in dry terms) bentonite clay and 30 g of water. The prepared solution is heated and, with continuous stirring, is dissolved in 65 g of a mixture of salts: NH4H2PO4,

(NH4) 2HPO4, CO (NH2) 2, NH4H2PO2 and

KH2P02 With the ratio N: P2O5: K2O 1: 3: 1.

Fluid suspended fertilizer is obtained with a shear; they have a nutrient content of 63%. During a 3-4 week run, the fertilizer does not change its consistency and remains well flowing.

Example 3. 8 g of sulphite-cellulose 50% lye was dissolved in 30 g of water. The prepared solution is heated and with stirring, 62 g of a mixture of salts: NH4H2PO4, (NH4) 2HPO4, CO (NH2) 2, NH4H2PO2, and KH2PO2 with a ratio of N: P2O5: K: 1: 4: 1 is dissolved in it.

A flowable suspended fertilizer is obtained with sheath, with a nutrient content of about 66%. When standing for 2-3 weeks, the fertilizer does not change its consistency and remains well flowing.

Example 4. 50 g (in terms of dry) of sterile activated sludge is mixed with 25 g of H20. The prepared solution is heated and with stirring, 70 g of a mixture of salts: NH4H2PO4, (LH4) 2PR04, CO (NH2) 2, NaH2PO2, and KH2PO2 with a ratio of N: P2O5: K2O 1: 5: 1 is dissolved in it.

Fluid suspended fertilizer is obtained with a total nutrient content of 66.5%. On standing for 3–4 weeks, some delamination is observed, which is eliminated with stirring. The suspension acquires an initial consistency and good fluidity.

Example 5. Preparing a solution of the suspending agent in water. To do this, 2.3 g (in terms of dry) dry bentonite clay is mixed with water in such quantity that

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the total weight of the solution was 30 g. Then (g) was added to the prepared solution with heating and continuous stirring: 10.0 NH4H2P04; 10.0 (NH4) 2HP04; 10.0 CO (NP2) 2; 20.0 KROZ and 20.0 KN2PO2.

Fluid suspended fertilizer is obtained with a total nutrient content of 62.2% at a ratio of N: P2O5::: 4.6: 2.1. The fertilizer does not change its consistency over the course of 2–3 weeks and remains well flowing.

Example 6. A solution of a suspending agent in water is prepared with a total weight of 30 g of the solution, for which 8.0 g of sulphite cellulose liquor (50% concentrate) is dissolved in water. Then, in heating and continuous stirring, the prepared solution is introduced (in g): 4 NH4H2PO4; 4 (NH4) 2HPO4; 10.0 CO (NH2) 2; 25.0 KROZ and 25.0 KN2PO2.

Fluid suspended fertilizer is obtained with a total nutrient content of 65.3% at a ratio of N: P2O5:: 5.0: 3.0. When standing for 2-3 weeks, the fertilizer does not change its consistency and remains well flowing.

Subject invention

Claims (2)

1. A method of producing complex suspended fertilizers based on urea, ammonium phosphate and an alkali metal salt, characterized in that, in order to bring the amount of nutrient salts in the fertilizer to more than 60% and to expand the range of nutrient salts, potassium hypophosphite is used as the alkali metal salt, which is mixed with sodium or ammonium hypophosphite, followed by saturation with the resulting mixture of an aqueous solution of the suspending agent. 2. A method according to claim 1, wherein potassium, sodium or ammonium hypophosphite is used in a mixture with potassium metaphosphate.