Method for producing nitrate-and-sulfur-based compound fertilizer and co-producing gypsum by utilizing potassium hydrogen sulfate

A technology of nitrosulfur-based compound fertilizer and potassium hydrogen sulfate, applied in the direction of calcium/strontium/barium sulfate, application, fertilization device, etc. High, simplified operation, lower investment effect

Inactive Publication Date: 2011-07-20
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the disadvantages of complex operation, huge investment, and inability to produce NPK compound fertilizers in the existing frozen nitrophosphate fertilizer process, and the decalcification by-product calcium sulfate calcium sulfate precipitation impurity content of the acidolysis solution of the existing nitric acid decomposition of phosphate rock High shortcomings that cannot be comprehensively utilized, provide a method of using potassium bisulfate to produce nitrosulfur-based compound fertilizer by-product gypsum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: implement raw material: 1, phosphate rock powder: P 2 o 5 The content is 30.72%, CaO is 48.28%; 2. Nitric acid: concentration 70%; 3. Industrial ammonium sulfate: ammonia content 21%.

[0035] The implementation process of the present invention comprises the following steps:

[0036] (1) After adding water to the phosphate rock powder, carry out acidolysis reaction with 70% nitric acid, the molar ratio of calcium ion and nitric acid in the phosphate rock is 1:3; the reaction temperature is 45° C., and the reaction is 0.5 hour.

[0037] (2) The crude acid hydrolyzate obtained in step (1) is filtered to remove acid insoluble matter and organic floating matter, and the filtrate is fine acid hydrolyzate.

[0038] (3) the refined acid hydrolyzate of step (2) is added to industrial ammonium sulfate and carry out metathesis reaction, and the ammonium sulfate add-on is by the mol ratio of calcium ion in ammonium sulfate and refined acid hydrolyzate 1: 1; Reactio...

Embodiment 2

[0041] Embodiment 2: implement raw material: 1, phosphate rock powder: P 2 o 5 The content is 29.85%, CaO is 48.30%; 2. Nitric acid: the concentration is 40%; 3. Industrial ammonium sulfate: the ammonia content is 21%.

[0042]The implementation process of the present invention comprises the following steps:

[0043] (1) Add water to phosphate rock powder and carry out acid hydrolysis reaction with 40% nitric acid, the molar ratio of calcium ions and nitric acid in the phosphate rock is 1:2; the reaction temperature is 70° C., and react for 4 hours.

[0044] (2) The crude acid hydrolyzate obtained in step (1) is filtered to remove acid insoluble matter and organic floating matter, and the filtrate is fine acid hydrolyzate.

[0045] (3) the refined acid hydrolyzate of step (2) is added to industrial ammonium sulfate and carry out metathesis reaction, the ammonium sulfate add-on is by the mol ratio of calcium ion in ammonium sulfate and refined acid hydrolyzate 1.2: 1; Tempera...

Embodiment 3

[0048] Embodiment 3: implement raw material: 1, phosphate rock powder: P 2 o 5 The content is 31.05%, CaO is 47.65%; 2. Nitric acid: concentration 60%; 3. Industrial sulfuric acid: concentration 98%.

[0049] The implementation process of the present invention comprises the following steps:

[0050] (1) Add water to phosphate rock powder and carry out acidolysis reaction with 60% nitric acid, the molar ratio of calcium ion and nitric acid in the phosphate rock is 1:2.3; the reaction temperature is 58° C., and the reaction is 1.5 hours.

[0051] (2) The crude acid hydrolyzate obtained in step (1) is filtered to remove acid insoluble matter and organic floating matter, and the filtrate is fine acid hydrolyzate.

[0052] (3) the refined acid hydrolyzate of step (2) is added industrial sulfuric acid to carry out metathesis reaction, and the sulfuric acid addition is by the mol ratio 1.1: 1 of calcium ion in sulfate radical ion and refined acid hydrolyzate; Reaction temperature i...

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Abstract

The invention discloses a method for producing a nitrate-and-sulfur-based compound fertilizer and co-producing gypsum by utilizing potassium hydrogen sulfate, belonging to the technical field of compound fertilizers. The method comprises the following steps: decomposing phosphrite with nitric acid; filtering and removing acid-insoluble substances and organic suspended matters; adding industrial ammonium sulfate or sulfuric acid in the purified acidolysis solution for decalcification; filtering so as to obtain decalcified byproduct high-purity gypsum; producing the nitrate-and-sulfur-based compound fertilizer by using the decalcified acidolysis solution; directly carrying out neutralization reaction on the decalcified acidolysis solution and gas ammonia so as to obtain nitrophosphate fertilizer slurry containing ammonium nitrate and monoammonium phosphate; evaporating the slurry, and then adding potassium hydrogen sulfate; and then granulating and drying so as to obtain the nitrate-and-sulfur-based compound fertilizer. In the invention, the calcium in the acidolysis solution generated after the phosphrite is decomposed by phosphoric acid is removed by using the ammonium sulfate or sulfuric acid, and other impurity ions are not added; and as a nutrient, the ammonia in the ammonium sulfate is remained in a finished product when the calcium is removed by using the ammonium sulfate. The removal rate of the calcium in the acidolysis solution is up to above 95%.

Description

Technical field: [0001] The invention relates to a method for producing nitrosulfur-based compound fertilizer by-product high-purity gypsum by decomposing phosphate rock with nitric acid, belonging to the technical field of compound fertilizer production, and specifically relates to a method for producing compound fertilizer and high-purity gypsum by decomposing phosphate rock with nitric acid. Background technique: [0002] Sulfur (chlorine)-based compound fertilizers containing nitrate nitrogen are called nitrate-based compound fertilizers. The main feature of nitric acid decomposition of phosphate rock to prepare compound fertilizer is that nitric acid plays a dual role: it uses the strong acidity of nitric acid to decompose phosphate rock to produce phosphoric acid, replaces sulfuric acid to decompose phosphate rock, saves sulfuric acid, and its anions themselves serve as Nitrate nitrogen nutrients remain in the product, making the most of the chemical reactants. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C05G1/00
Inventor 万连步徐淑班张强
Owner KINGENTA ECOLOGICAL ENG GRP
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