Method for producing defluorinated ammonium phosphate

A technology for defluorinated ammonium phosphate and production method, which is applied in the directions of phosphates, phosphorus oxyacids, halogenated silicon compounds, etc., can solve the problems of defluorination without wet-process phosphoric acid, reduce fertilizer efficiency, reduce emission pollution, and avoid potassium the effect of the loss

Inactive Publication Date: 2010-05-19
SHANDONG HONGRI ACRON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of ammonium phosphate, there is no literature report on the defluorination of wet-process phosphoric acid

Method used

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  • Method for producing defluorinated ammonium phosphate
  • Method for producing defluorinated ammonium phosphate
  • Method for producing defluorinated ammonium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw material 1: Wet-process phosphoric acid, collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0019] The chemical composition of wet-process phosphoric acid is shown in the table below

[0020]

[0021] Raw material 2: Potassium sulfate (K 2 SO 4 Content 98%), collection location: Shandong Hongri Akang Chemical Co., Ltd.

Embodiment approach

[0023] The wet-process phosphoric acid is filtered through sedimentation to remove suspended solids, and then massaged by K + : H 2 SiF 6 =2 Add solid potassium sulfate and carry out defluorination reaction at 80℃ for 45min. After the reaction, the material liquid is settled and filtered to remove the solid precipitate. The solid precipitate is washed and dried to become the by-product potassium fluorosilicate; the filtrate is defluorinated phosphoric acid . Neutralize the defluorinated phosphoric acid with ammonia gas, and control the pH value around 6.5.

[0024] The neutralized slurry is concentrated, sprayed and granulated, dried, sieved, and packaged to become the final product of ammonium phosphate.

[0025] Implementation results:

[0026] 1. Defluorinated ammonium phosphate

[0027] The N content in the prepared defluorinated ammonium phosphate is 10.5%, P 2 O 5 The content is 47.3%, the total nutrient NPK≥45%, which meets the requirements of high-concentration compound ferti...

Embodiment 2

[0031] Raw material 1: Wet-process phosphoric acid, collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0032] The chemical composition of wet-process phosphoric acid is shown in the table below

[0033]

[0034] Raw material 2: Potassium chloride (KCl content 98%), collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0035] method of execution:

[0036] The wet-process phosphoric acid is filtered through sedimentation to remove suspended solids, and then massaged by K + : H 2 SiF 6 =1.5 Add solid potassium chloride and carry out defluorination reaction at 60°C for 90 minutes. The reacted material is settled and filtered to remove the solid precipitate. The solid precipitate is washed and dried to become the by-product potassium fluorosilicate; the filtrate is defluorination Phosphoric acid. The defluorinated phosphoric acid and ammonia gas are ammoniated in an ammoniating granulator (control the pH value to be around 6.5), granulating, drying, screening, packa...

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Abstract

The invention relates to a method for producing defluorinated ammonium phosphate and belongs to the technical field of chemical production. In the method, a fluosilicic acid in a wet-process phosphoric acid is made to generate potassium (or sodium) fluosilicate precipitate in a mode of adding soluble potassium (or sodium) salt, potassium (or sodium) fluosilicate is a by-product after the potassium (or sodium) fluosilicate precipitate is separated, the defluorinated wet-process phosphoric acid is subjected to neutralization reaction with gas ammonia, and a neutralized slurry is prepared into the defluorinated ammonium phosphate by the steps of concentrating, drying, packaging and the like. The method for producing the defluorinated ammonium phosphate is mainly used in the field of fertilizer production.

Description

Technical field [0001] The invention relates to a production method of defluorinated ammonium phosphate, which belongs to the technical field of chemical production. Background technique [0002] In the production process of wet-process phosphoric acid, a small amount of fluorine in the phosphate rock is converted into gas phase silicon tetrafluoride (SiF 4 ) Escaped in the form of fluorosilicic acid (H 2 SiF 6 ) In the form of wet-process phosphoric acid. When wet-process phosphoric acid is used to produce solid ammonium phosphate, this part of fluorosilicic acid is neutralized by ammonia into ammonium fluorosilicate, which is returned to the environment with the use of fertilizers, which does not reflect the value of fluorine resources. [0003] In my country, fluorine chemical products except sodium fluorosilicate are mainly produced with fluorite as raw material. However, the reserves of fluorite mines are limited and are facing exhaustion. In view of the importance of fluorit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C01B33/10
Inventor 张西兴胡兆平张朝森李新柱
Owner SHANDONG HONGRI ACRON CHEM
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