SU1217859A1 - Method of producing complex fertilizer - Google Patents

Description

one

The invention relates to a technique for producing complex, slow-acting fertilizers, providing more complete utilization of nutrients by plants.

The purpose of the invention is to improve the quality of the fertilizer and the intensification of the process.

The essence of the proposed method lies in the fact that when using a nitrogen-containing solution of ammonium phosphate or a mixture of phosphate and ammonium nitrate, approx. The reactor feeds with 100 ma.ch. phosphate and 400 May. nitrate, tnofosfatno1 o solution (10% Pa.05, 10% V), pre-ammoniated to pH 3. The mass with a PjOs ratio of solution: P7.0 5 1.6: 1 phosphate is stirred for 20 m at a temperature of 80 ° С granulated dry. The finished product (286 wt.h.h. has the following composition,%: PiOsoSiu, 22.7; b 18.4; P Osgog 13.9;

Dit-more complete destruction of the internal structure of phosphorus compared ytSiPaOsoS iu, 81,0; P7.05 & og: with a known method, due to P ozo sh, 61.2; , 9 (which is 2-3 times increased relative phosphate 50.4%).

The content in the fertilizer is assimilable PI0s (soluble in 2% citric acid). The process involves only the destruction of the internal structure of phosphorus — deformation of the crystal lattice of the phosphorus-containing mineral — without decomposing it, as a result of which ammonium phosphate introduced into the system remains as a water-soluble component in the product.

Example 1. As phosphorite use a sample containing the following components, wt.%:

.Pa05s 5sh.25,, 65, CaO 39.7;

CO2 8.1; Pr05chbsb-Pr 5o6sch 1.6. 100 ma.h. are fed to the reactor. phosphorite and 186 mAh., a nitrate-phosphate solution (10%, 10% N), previously ammoniated to pH 3. The suspension with the ratio PjOs pacTBopavPtOs of phosphorite 0.75: 1 is mixed for 10 minutes at 120 C, granulated and su- chat The finished product (192 wt.h.) has the following composition,%: PaOsoSi 22.7, 15.1, P ,, OsBo, 9.9,

Example 4. 00 mph are fed to the reactor. phosphate and 182 ma.h. 20 ammonium phosphate solution (22%, obtained by ammonization of phosphoric acid with abstraction to pH 3. The suspension with a ratio of solution of phosphorite 1.6: 1 is mixed 25 for 20 minutes at 80 ° C, granulated and dried. Finished product (170 wt. .h.) has the following composition,%: P OSO & UX 38.2; P Ogsicb 30.8; PiOsBog 23.5; PiOs-icB: PJ) 5oSmf80,6; 30 P OsBoa: P40soSai, 61.5; , 6 (P2. In phosphate 49.6%).

The table lists examples of the process in the proposed parameter ranges (examples 1-4) and the values that go beyond their limits. Examples 3 and 4 differ in the amount of nutrients in the product, as they are obtained from different solutions.

A decrease in the ratio of P.jO of the d: P405 phosphate solution to 0.4: 1 and 0.3: 1 (when 1-1er 5 and 6) leads to a decrease in digestible and water-soluble phosphates due to the insufficient amount of the solution used for

P Ob- “cS: Pz05o5u, 66.5, P, 0-5i„, 45 “of phosphate processing. 45.0; N9.9 (.cB in S ° n ™ f "" "-" "and solution: P / 05 phosphate to 1.7: 1 and 1.8: 1

50

42.2 rel.%).

Example 2. 100 wt.h. phosphate and 250 wt.h. nitrate phosphate solution (10%, 10% N), which is preliminarily ammoniated to pH 3. Cous - penzy with the ratio Pg of solution: phosphate 1: 1 is stirred for 15 minutes at a temperature, dried and granulated. The finished product (220 parts by weight) has the following composition,%: PrOsoSui, 22.7; Pr05ch6 16.5;

(examples 7 and: 8) leads to a decrease in the amount of water-soluble phosphates in the fertilizer due to the decomposition of phosphate and an increase in equipment, which is impractical.

By increasing the process temperature to 130 ° C (Example 9), the content of the water-soluble form is reduced due to the partial decomposition of phosphate and binding of the solution to diacetate phosphate.

217859 Р, О

11.3; RgOvuOv: PiOso5.M., 7;

ten

Pa05oWPiOfo5-u4 50; . N11.3 CPrOs.scR in phosphate 45.8 rel.%) -.

Example 100 ma.h. are fed to the reactor. phosphate and 400 ma.ch. nitra, tnofosfatno1 about solution (10% of P.05, 10% V), previously ammoniated to pH 3. Mass with the ratio PjOs of solution: P7.0 5 of phosphorite 1.6: 1 is stirred for 20 minutes at a temperature of 80 ° С, granulated and dried. The finished product (286 wt.h.h. has the following composition,%: PiOsoSiu, 22.7; b 18.4; P Osgog 13.9;

 ytSiPaOsoS iu, 81.0; P7.05 & og: 61.2; , 9 (in phosphorite 50.4%).

Example 4. 00 mph are fed to the reactor. phosphate and 182 ma.h. ammonium phosphate solution (22%, obtained by ammonization of phosphoric acid with abstraction to pH 3. The suspension with the ratio of solution: phosphorite 1.6: 1 is stirred for 20 minutes at 80 ° C, granulated and dried. Compound product (170 wt. h) has the following composition,%: P OSO & UX 38.2; P Ogsicb 30.8; PiOsBog 23.5; PiOs-icB: PJ) 5oSmf80,6; P OsBoa: P40soSai, 61.5; , 6 (P2. In phosphate 49.6%).

The table lists examples of the process in the proposed parameter ranges (examples 1-4) and with values exceeding their limits. Examples 3 and 4 differ in the amount of nutrients in the product, as they are obtained from different solutions.

A decrease in the ratio of P.jO solution: P405 phosphate to 0.4: 1 and 0.3: 1 (when 1-1er 5 and. 6) leads to a decrease in digestible and water-soluble phosphates due to the insufficient amount of solution used for

ra: P / 05 phosphorite before. 1.7: 1 and 1.8: 1

(examples 7 and: 8) leads to a decrease in the amount of water-soluble phosphates in the fertilizer due to the decomposition of phosphate and an increase in equipment, which is impractical.

By increasing the process temperature to 130 ° C (Example 9), the content of the water-soluble form is reduced due to the partial decomposition of phosphate and binding of the solution to diacetate phosphate.

Reducing the process temperature to (Example 10) and the processing time to 5 minutes (Example I1) leads to a decrease in the content of digestible phosphates due to low activation of phosphate.

The increase in processing time of phosphate to 25 minutes (example non - leads to improved performance

Compiled by D.Tokshina Editor S.Lisina Tehred Z.Kastelevich Proofreader M.Pojo

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VNIIL of the USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

process, but with this, it increases the amount of equipment.

Thus, the proposed method allows to increase the content of the assimilable form P Os from the total amount a 1.2-1.6 times and 3-9 times to reduce the duration of the process.

Claims (2)

1. METHOD FOR PRODUCING INTEGRATED FERTILIZER by mixing phosphorite with a nitrogen-containing solution, granulating and drying the mass, characterized in that, in order to improve the quality of the fertilizer and intensify the process, ammonium phosphate or a mixture of it with ammonium nitrate taken in an amount is used as a nitrogen-containing solution. 0.75- 1.6 parts by weight Ρχθ5 solution for 1 wt.h. Ρ <χθ5 phosphorite and mixing is carried out at 80-120 ° C. 2. The method according to π. 1, characterized in that the mass is maintained for 10-20 minutes before granulation. SU,.,. 1217859