SU1527225A1 - Method of producing molybdenum-containing fertilizer - Google Patents

Abstract

The invention relates to the production of mineral fertilizers containing microelements, in particular molybdenum, widely used in agriculture. The purpose of the invention is to improve the quality of the fertilizer by reducing caking. The method for producing molybdenum-containing fertilizer involves decomposing the phosphate feed with a mixture of sulfuric and nitric acids, neutralizing to a molar ratio in NH ₃ : H ₃ PO ₄ pulp of 1.2-1.4, and mixing the pulp with a molybdenum-containing acid solution in the ratio ( 20-50): 1 respectively. As the molybdenum-containing acidic solution, the product of ammonization of the pickling solution of electric-tube production with a molar ratio of NH ₃ : H ₃ PO ₄ in it is equal to 0.7-0.9. 1 hp f-ly, 3 tab.

Description

The invention relates to the production of mineral fertilizers containing trace elements, in particular molybdenum, widely used in agriculture.

The purpose of the invention is to improve the quality of fertilizers by reducing caking.

Example 1. 300 g of apatite decompose 370 g of a mixture (in terms of monohydrate) of nitric acid with a concentration of 47% HNOj and sulfuric acid with a concentration of 93%., Taken in a 1: 1 ratio. The resulting pulp is neutralized with ammonia to a molar ratio of NH3: 1.2 in it, then mixed with 50 g of the waste liquor of an electrolamp production pre-ammoniated to a molar ratio of 0.7. Etching solution contains 20% nitric, 30% sulfuric and 10% molybdic acids. The ratio of pulp and pickling solution is 20: 1. B. i the mixture is added 200 g of cauline chloride (LIA. The mixture is granulated and dried at 90 ° C to a moisture content of 1%. The result is 1 kg of the finished product containing 11% nitrogen, 11%, of which 50% is in water soluble form , 11% and 0.3% molybdenum. Traceability of the fertilizer is 12%.

Example 2, 300 g of apatite are decomposed with 370 g (in terms of mono-hydrate) of nitric acid with a concentration of 47% and sulfuric acid with a concentration of 93% HjSO, taken in a 0.5: 1 ratio. The resulting pulp is neutralized with ammonia to a molar ratio of 10

20

31527225

nor in it nh,:. 1.3 with 20 g of the spent pickling solution pre-ammoniated to the molar ratio NH: 0.8, The pickling solution contains 20% nitric, 30% sulfuric and 10% molybdic acids. The ratio of pulp and pickling solution is 50: 1. 200 g of potassium chloride is added to the mixture. The mixture is granulated and dried at 90 ° C to a moisture content of 1%. As a result, 1 kg of product containing 7% nitrogen, 14% is obtained, of which 50% in water-soluble form, 11%, 0.13% molybdenum, Trace fertilizer consumption of 10% ,

Hp and me 3, 300 g of apatite decompose 370 g of a mixture of Guv in terms of monohydrate) nitric acid with a concentration of 47% HNOj, H of sulfuric acid with a concentration of 93%, taken in a ratio of 1.3: 1. The resulting pulp is neutralized with dmmiak to a molar ratio in it NHj: 1.4, then mixed with 35 g of the spent pickling solution, previously ammoniated to the molar ratio in it H, PQ; 0.9, the pickling solution contains JQ 20% nitrogen, .30% sulfuric and 10% molybdic acid. The ratio of pulp and pickling solution is 30: 1, 200 g of potassium chloride is added to the mixture. The mixture is granulated and dried at 90 ° C to a moisture content of 1%. The result is 1 kg of a product containing 12.5% nitrogen, 7.5%, of which 50% in water-soluble form 11% K2.0 and 0.3% molybdenum. Traceability of the fertilizer 10%,

The essence of the invention is that with the proposed sequence of operations for the decomposition of phosphate raw materials with a mixture of acids and neutralization of the resulting pulp to a molar ratio of U: 1,2: 1.4, diammonium phosphate is formed. With the subsequent introduction of an acidic molybdenum-containing solution, in which quality is used the product of ammonization of the pickling solution of electric-tube production with the molar ratio NH: HzP04. 0.7-0.9: 1, the ammoniapyramide is redistributed, and the possibility of their recrystallization is completely eliminated, which consequently reduces the caking of the product obtained,

Table 1 shows the dependency of the finished product and the content of water-soluble PiOj in it on the molar ratio U: in the neutralized pulp. Tracking was determined by the content in the product of lumps (in%) larger than 10 mm after 10 months of storage in the stack. 10 bags high. Ratio

JC pulp: the molybdenum-containing solution in all experiments is equal to 20: 1. As the acidic molybdenum-containing solution, an ammoniated pickling solution of the electrolamp production with a molar ratio of Shz: HjPO 0.8 was used

As can be seen from the table, the ratio of GShd: in the pulp should be equal to 1.2-1.4, since as it decreases

25 to 1.1 there is a sharp increase in caking. An increase in the ratio of more than 1.4 is impractical, since the caking is not reduced, but the content of water-soluble drops in the product.

Table 2 shows the dependence of the survivability of the finished product and the content

35

40

50

zhani in it is water soluble from

ratios of the pulp supplied for smassing and the molybdenum-containing solution. In all experiments, pulp with a molar ratio of HSh:, is supplied for mixing. 1,3 and ammoniated pickling solution with a ratio of HS

: H, ROF 0.8.

. As can be seen from table 2, a decrease in the ratio of pulp and molybdenum-containing solution is lower than 20: 1, it is expedient because the caking fertilizer increases dramatically, and an increase in it above 50: 1 also leads to an increase in caking and a decrease in water-soluble content.

Table 3 shows the dependence of the caking of the product and the corrosivity of the medium on the NH molar ratio: in the acidic molybdenum-containing flux in the pulp used to form a monoammorphous material. In all experiments, the ratio of nirophosphate. With this transition form u; H, RO in neutralized pulp is 1.3, and the ratio of pulp to molybdenum-containing solution is 30: 1,

crystals change - from elongated it becomes shortened along the edges

0

0

Q

pyramid, and the possibility of their recrystallization is completely eliminated, which consequently reduces the caking of the product obtained,

Table 1 shows the dependency of the finished product's traceability and the content of water-soluble PiOj on the molar ratio U: in the neutralized pulp. Tracking was determined by the content in the product of lumps (in%) larger than 10 mm after 10 months of storage. stack of 10 bags high. Ratio

C pulp: molybdenum-containing solution in all experiments is equal to 20: 1. As an acidic molybdenum-containing solution, an ammoniated pickling solution of an electric-tube production with a molar ratio of Shz: HjPO 0.8 was used

As can be seen from the table, the ratio of GSHD: in the pulp should be equal to 1.2-1.4, since as

5 to 1.1 there is a sharp increase in caking. An increase in the ratio of more than 1.4 is impractical because the caking is not reduced, but the content of water-soluble drops in the product.

Table 2 shows the dependence of the caking of the finished product and its water-soluble content on

the ratio of the pulp supplied to the mixture, and the molybdenum-containing solution. In all experiments, pulp with molar ration of HS is used for mixing:,:. 1,3 and ammoniated pickling solution with a ratio of HS

: H, ROF 0.8.

. As can be seen from tabl2, decline; the ratio of pulp and molybdenum-containing solution is lower than 20: 1; this is not advisable, as the caking fertilizer increases dramatically, and an increase in it above 50: 1 also leads to an increase in caking and a decrease in the water-soluble content in the product

Table 3 shows the dependence of the caking of the product and the corrosivity of the medium on the molar ratio of NH ": in the acid used molybdenum containing the order 7476/32

Circulation 391

Subscription

VIINPI of the State Committee on Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab.

Claims (2)

Fore, content; nitrogen, phosphorus t potassium and the molybmula of the invention A method for producing fertilizer, one. containing molybdenum, including the decomposition of phosphate raw materials with a mixture of sulfuric and nitric acids, the introduction of a molybdenum-containing solution into the pulp and its neutralization, expansion and dilution are carried out with NH ^: Η, ΡΟφ pulp equal to 1.2-1.4, and then the pulp is mixed with molybdenum-containing acidic solution in a ratio of 20-50: 1, respectively, 2, The method according to claim 1, characterized in that as a molybdenum-containing acidic solution, differ in that, in order to improve the fertilizer due to tracking ability, neutralization to a molar ratio in: Η, ΡΟφ Table 1 The ratio of MN,: N, PO ₊ in the neutralized pulp Product Traceability, % The content of water-soluble P ^ O ^ in the product, % ι, ι 60 fifty 1,2 10 fifty 1.3 10 fifty 1.4 10 fifty 1,5 10 40 Table ^ Ratio Tracking- Content pulp: rast- capacity water management thief product Rome P ₂ 0 ₅ % in the product,% 15: 1 60 fifty 20: 1 10 fifty 35: 1 10 fifty 50: 1 10 fifty 60: 1 40 40 Ratio NH ₅ : H, PO ₄ in a molybdenum-containing solution Table3 Slediva- G: product capacity,% Resistance of X18H10T steel to solution