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Method for producing chloride-based compound fertilizer and co-producing gypsum through decomposing phosphorite with hydrochloric acid

A technology of by-product gypsum and compound fertilizer, which is applied in fertilization equipment, fertilizer mixture, calcium/strontium/barium sulfate, etc., can solve the problems such as difficulty in separating calcium chloride from phosphate rock and decomposition liquid, and achieve investment reduction and removal The effect of high efficiency and simplified operation

Active 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

[0003] The purpose of the present invention is to overcome the problem that the existing hydrochloric acid decomposes phosphate rock calcium chloride and the separation of the decomposition solution is difficult, and uses ammonium sulfate as the decalcification agent to remove the calcium ions in the decomposition solution, and by-product high-purity gypsum, ammonium sulfate Ammonium ions remain in the decomposed mother liquor, and the decalcified decomposed liquid is neutralized by gas ammonia, evaporated, dried and other processes to produce chlorine-based compound fertilizers, and a method for hydrochloric acid to decompose phosphate rock to produce chlorine-based compound fertilizers by-product gypsum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: implement raw material: 1, phosphate rock powder: P 2 0 5 The content is 20.33%, CaO is 27.64%; 2. Hydrochloric acid: concentration 30%; 3. Industrial ammonium sulfate: ammonia content 21%.

[0017] The implementation process of the present invention comprises the following steps:

[0018] (1) After adding water to the phosphate rock powder, carry out acid hydrolysis reaction with 30% hydrochloric acid, the molar ratio of calcium ions and hydrochloric acid in the phosphate rock is 1:2.2; the reaction temperature is 20°C, and the reaction is carried out for 4 hours.

[0019] (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.

[0020] (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 1.2: 1 of calcium ion in sulfate ion and r...

Embodiment 2

[0023] Embodiment 2: implement raw material: 1, phosphate rock powder: P 2 o 5 The content is 29.85%, CaO is 48.30%; 2. Hydrochloric acid: the concentration is 20%; 3. Industrial ammonium sulfate: the ammonia content is 21%.

[0024] The implementation process of the present invention comprises the following steps:

[0025] (1) After adding water to the phosphate rock powder, carry out acid hydrolysis reaction with 20% hydrochloric acid, the molar ratio of calcium ion and hydrochloric acid in the phosphate rock is 1:2; the reaction temperature is 60° C., and the reaction is 0.2 hours.

[0026] (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.

[0027] (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 ...

Embodiment 3

[0030] Embodiment 3: implement raw material: 1, phosphate rock powder: P 2 o 5 The content is 31.05%, CaO is 47.65%; 2. Hydrochloric acid: concentration 30%; 3. Industrial ammonium sulfate: ammonia content 21%.

[0031] The implementation process of the present invention comprises the following steps:

[0032] (1) After adding water to the phosphate rock powder, carry out acid hydrolysis reaction with 30% hydrochloric acid, the molar ratio of calcium ion and hydrochloric acid in the phosphate rock is 1:2.1; the reaction temperature is 50° C., and the reaction is 1.5 hours.

[0033] (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.

[0034] (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: 1 of calcium ion in sulfate ion and refined acid h...

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PUM

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Abstract

The invention provides a method for producing chloride-based compound fertilizer and co-producing gypsum through decomposing phosphorite with hydrochloric acid, belonging to the technical field of compound fertilizer production. The method comprises the following steps: after the phosphorite is decomposed by using the hydrochloric acid, filtering and removing acid-insoluble substances and organic suspended matters; adding industrial ammonium sulfate in the purified acidolysis solution for decalcification; filtering so as to obtain the decalcified byproduct high-purity gypsum; and producing a nitrate-and-chloride-based compound fertilizer by using the decalcified acidolysis solution. After the phosphorite is decomposed, the calcium in the acidolysis solution generated is removed by using the ammonium sulfate, 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 decomposing phosphate rock with hydrochloric acid to produce high-purity gypsum by-product of chlorine-based compound fertilizer, which belongs 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 hydrochloric acid. Background technique: [0002] The process of hydrochloric acid decomposition of phosphate rock to produce phosphoric acid has long been studied at home and abroad, but there is no domestic factory that uses this process to produce phosphoric acid. Document 1 Fertilizer Engineering Series "Phosphate Phosphate Fertilizers and Compound Fertilizers" (Edited by Jiang Shanxiang, Chemical Industry Press, 1999) introduces the process of hydrochloric acid decomposition of phosphate rock to produce phosphoric acid. This process has the problem of difficult separation of calcium c...

Claims

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Application Information

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IPC IPC(8): C01F11/46C05G1/00
Inventor 李广涛陈德清范玲超
Owner KINGENTA ECOLOGICAL ENG GRP
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