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Method for producing nitro/S-based compound fertilizer and coproducing plaster

A technology of nitrosulfur-based compound fertilizer and by-product gypsum, applied in fertilization equipment, fertilizer mixture, calcium/strontium/barium sulfate, etc., can solve the problems of complex operation, huge investment, high cost and incomprehensible utilization, and achieve simplified operation , reduced investment and high removal rate

Active Publication Date: 2012-11-28
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 flow and the high content of impurities in the decalcification by-product calcium sulfate precipitate of the existing nitric acid decomposed phosphate rock. Comprehensive utilization of shortcomings, providing a method for producing 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 0 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, the ammonium sulfate add-on is by the mol ratio 1: 1 of calcium ion in sulfate radical ion and refined acid hydrolyzate; Reaction...

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; Temperat...

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; the reaction temperature is 50° 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 add-on is by the mol ratio 1.1: 1 of calcium ion in sulfate radical ion and refined acid hydrolyzate; Reaction temperature is 60...

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PUM

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Abstract

The invention provides a method for producing a nitro / S-based compound fertilizer and coproducing plaster, belonging to the technical field of compound fertilizer production. The method comprises the following steps: after decomposing phosphorite with nitric acid, firstly filtering and removing the acid insoluble matters and organic suspended matters; adding industrial ammonium sulfate or sulfuric acid to the purified acidolysis solution to remove calcium and filtering the reaction solution to obtain the calcium removed byproduct, namely high-purity plaster, wherein the acidolysis solution after calcium removal is used for producing the nitro / S-based compound fertilizer; and mixing the calcium removed acidolysis solution with acid potassium sulfate to form mixed acid, subjecting the mixed acid to carry out neutralization reaction with ammonia to obtain slurry containing ammonium nitrate, monoammonium phosphate, ammonium sulfate and potassium sulfate and pelleting and drying the slurryto obtain the nitro / S-based compound fertilizer. The method has the following beneficial effects: the ammonium sulfate or sulfuric acid is used for removing calcium from the acidolysis solution obtained after decomposing phosphorite with the nitric acid, without bringing other foreign ions, and ammonia in the ammonium sulfate when the ammonium sulfate is used for removing calcium is retained in the finished product as nutrient; and the calcium removal rate of the acidolysis solution is high and is more than 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 Patents(China)
IPC IPC(8): C01F11/46C05G1/00
Inventor 万连步张强徐淑班
Owner KINGENTA ECOLOGICAL ENG GRP