Method for producing byproduct gypsum of niter-sulfur-based compound fertilizer by decomposing phosphorite with nitric acid

A technology for nitrosulfur-based compound fertilizer and by-product gypsum, which is applied in fertilization devices, fertilizer mixtures, calcium/strontium/barium sulfate and other directions, can solve the problems of complicated operation, huge investment, high impurity content and cannot be comprehensively utilized, etc. The effect of high removal rate, simplified operation and reduced investment

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

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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 decal...

Method used

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Comparison scheme
Effect test

Embodiment 1

[0033] 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%; 4. Industrial potassium sulfate: K 2 The O content is 52%.

[0034] The implementation process of the present invention comprises the following steps:

[0035] (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.

[0036] (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.

[0037] (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...

Embodiment 2

[0040] 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: concentration 40%; 3. Industrial ammonium sulfate: ammonia content 21%; 4. Industrial potassium sulfate: K 2 The O content is 52%.

[0041] The implementation process of the present invention comprises the following steps:

[0042] (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.

[0043] (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.

[0044] (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...

Embodiment 3

[0047] 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%; 4. Industrial potassium sulfate: K 2 The O content is 52%.

[0048] The implementation process of the present invention comprises the following steps:

[0049] (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.

[0050] (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.

[0051] (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 ...

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Abstract

The invention discloses a method for producing byproduct gypsum of a niter-sulfur-based compound fertilizer by decomposing phosphorite with nitric acid, which belongs to the technical field of production of compound fertilizers. The method comprises the following steps of: decomposing phosphorite with nitric acid; removing acid non-soluble substances and organic suspended matters by filtering; adding purified acid hydrolysis liquid into industrial ammonium sulfate or sulfuric acid to remove calcium; filtering to obtain a calcium-removed byproduct, namely high-purity gypsum; and producing the niter-sulfur-based compound fertilizer by using calcium-removed acid hydrolysis liquid. By adopting the method, calcium is removed from the acid hydrolysis liquid used in decomposition of the phosphorite with nitric acid by using ammonia sulfate or sulfuric acid, other impurity ions are not introduced, and ammonia in ammonia sulfate is kept in a finished product during calcium removal with the ammonia sulfate; and the removing rate of calcium in the acid hydrolysis liquid reaches above 95 percent.

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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IPC IPC(8): C01F11/46C05G1/00
Inventor 陈宏坤范玲超李广涛
Owner KINGENTA ECOLOGICAL ENG GRP
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