SU1186609A1 - Method of producing complex fertilizer - Google Patents

Abstract

1. METHOD OF OBTAINING COMPLEX FERTILIZER, including decomposition of phosphate by nitric and sulfuric acids, ammonization of the resulting pulp, mixing it with potassium salt and drying the finished product, characterized in that, in order to increase the degree of decomposition of phosphate raw materials, reduce the degree of retrogradation of phosphorus in the ammoniation stage while saving nitric acid, decomposition is carried out in the presence of ammonium nitrate solution. 2. Method pop. 1, I differ by the fact that the ammonium nitrate solution is introduced in an amount of 20–50% by weight of nitric acid. Q 3. A method according to claim 1, characterized in that 40 are used (L 93% ammonium nitrate solution.

Description

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The invention relates to chemical technology of mineral fertilizers and is used to produce complex fertilizers by the nitrogen-sulphate processing of natural phosphates,

The purpose of the invention is to increase the degree of decomposition of phosphate raw materials, reduce the degree of phosphorus retrogradation at the ammonization stage, while saving nitric acid.

Example 1,. 298 kg of apatite concentrate are treated with 3i9 kg of 56% nitric acid and 61 kg of ammonium nitrate solution for 20 minutes. 206 kg of sulfuric acid are added to the suspension and after 20-30 minutes the mixture is neutralized with a pulp of 45.8 kg to a pH of 5. The neutralized pulp is mixed with 183 kg of potassium chloride and dried to remove 98.8 kg. The result is lt) 00 kg of complex fertilizer (nitrophosphate) with the ratio N: 1:: 1, with a total content of nutrients; 33% of substances.

PaciiijA nitric acid.hists in the predla -aexo-i npi uecnic: e by 20%, km-i; i by 15 /; Chosen with H3BecTKbiN, Stenl,.: Elo.: Api Bit Ages 98. 5%, degree of retrogradation and fosi.orchlh compounds ri amonization 5% g iO / o in the creative ciiococo. As a result, the consumption of apatite per 1 ton of oil (: ha is reduced by 22 kg.

P.: and m (p 2. 291 kg of Alatite-digging

kg

56Z-HO f nitric acid and 165 kg of 60% ammonium nitrate-B solution for 20 minutes. To noj; 5: eb: choi suspension. 206 KI 93% seryuy; at the slots and after 20-30 MHVi re 66092

mixing neutralizes the pulp of 39.6 kg of ammonia to a pH of 5. The neutralized pulp is mixed with 183 kg of potassium chloride and dried to remove 129.6 kg of water. As a result, 1000 kg of complex fertilizer (nitrophosphate) are obtained with the ratio i: 1: 1 with a total nutrient content of 33%.

The consumption of nitric acid in the proposed process is lower by 35%, ammonia by 26% compared with the known degree of decomposition is 99%, the degree of retrogradation of phosphorus compounds at the ammonization stage is 3% instead of 10% in the known method. As a result, the consumption of apatite per 1 ton of product is reduced by 29 kg.

Example 3. 295 kg of apatite concentrate are treated with 199 kg of 56% nitric acid and 354 kg of a 40% ammonium nitrate solution for 20 minutes. To the resulting suspension, 206 kg of 93% sulfuric acid are added and after 20-30 minutes of stirring, the pulp of 33.5 kg of ammonia is neutralized to a pH of 5. The neutralized pulp is mixed with 183 kg of potassium chloride and scrubbed to remove 256.5 kg of WATER. The result is 000 kg of complex fertilizer (nitrophosphate) with the ratio N: P205: KO 1: 1: 1, with a total nutrient content of 33%.

The consumption of nitric acid in the proposed process is lower than 50%, ammonia is 38% compared to the known, the degree of decomposition of apatite is 98.5%, the degree of retrogradation f (of the ethereal compounds at the ammonization stage is 4% instead of 10% in the known method. As a result, the consumption apatite per 1 ton of product is reduced by 25 kg.

Claims (3)

1. METHOD FOR PRODUCING COMPLEX FERTILIZER, including decomposition of phosphate raw materials with nitric and sulfuric acids, ammonia of the obtained pulp, mixing it with potassium salt and drying the finished product, characterized in that, in order to increase the degree of decomposition of phosphate raw materials, reduce the degree of phosphorus retrograde at the stage ammonization while saving nitric acid, decomposition is carried out in the presence of a solution of ammonium nitrate. 2. The method of pop. 1, with the fact that the solution of ammonium nitrate is introduced in an amount of 20 to 50% by weight of nitric acid. · 3. The method according to p. ^ Characterized in that they use a 4093% solution of ammonium nitrate. 609981 G ”RS>