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Method for producing defluorinated sulfenyl nitrogen-phosphorus-potassium compound fertilizer

A nitrogen-phosphorus-potassium compound fertilizer and defluorination sulfur-based technology is applied in the field of chemical production to achieve the effects of reducing emission pollution, realizing full utilization and saving potassium fertilizer resources

Inactive Publication Date: 2010-06-02
SHANDONG HONGRI ACRON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there is no method and process for producing sulfur-based nitrogen, phosphorus and potassium compound fertilizers by using wet-process phosphoric acid after defluorination

Method used

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  • Method for producing defluorinated sulfenyl nitrogen-phosphorus-potassium compound fertilizer
  • Method for producing defluorinated sulfenyl nitrogen-phosphorus-potassium compound fertilizer
  • Method for producing defluorinated sulfenyl nitrogen-phosphorus-potassium compound fertilizer

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Experimental program
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Effect test

Embodiment 1

[0029] Raw material 1: wet-process phosphoric acid, collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0030] The chemical composition of wet-process phosphoric acid is shown in the table below

[0031]

[0032] Raw material 2: Potassium sulfate (K 2 SO 4 content 98%), collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0033] Raw material 3: Potassium chloride (KCl content 98%), collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0034] Raw material 4: concentrated sulfuric acid (H 2 SO 4 content 98%), collection location: Shandong Hongri Akang Chemical Co., Ltd.

Embodiment approach

[0036] The preparation process of defluorinated sulfur-based NPK compound fertilizer is divided into the following steps:

[0037] (1) Preparation of defluorinated phosphoric acid: wet-process phosphoric acid is removed by sedimentation and filtration to remove suspended solids, and the molar ratio K + :H 2 SiF 6 =2 Add solid potassium sulfate and carry out defluorination reaction at 80°C for 45 minutes. After the reaction, the feed 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 .

[0038] (2) Preparation of potassium bisulfate: potassium chloride and concentrated sulfuric acid in molar ratio KCl: H 2 SO 4 = 1: 1 for proportioning, reacted at 105° C. for 60 minutes to generate potassium bisulfate slurry and hydrogen chloride gas, and the hydrogen chloride gas was absorbed by water to produce industrial hydrochloric acid...

Embodiment 2

[0050] Raw material 1: wet-process phosphoric acid, collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0051] The chemical composition of wet-process phosphoric acid is shown in the table below

[0052]

[0053]Raw material 2: Potassium chloride (KCl content 98%), collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0054] Raw material 3: concentrated sulfuric acid (H 2 SO 4 content 98%), collection location: Shandong Hongri Akang Chemical Co., Ltd.

[0055] method of execution:

[0056] The preparation process of defluorinated sulfur-based NPK compound fertilizer is divided into the following steps:

[0057] (1) Preparation of defluorinated phosphoric acid: wet-process phosphoric acid is removed by sedimentation and filtration to remove suspended solids, and the molar ratio K + :H 2 SiF 6 =1.5 Add solid potassium chloride and carry out defluorination reaction at 60°C for 90 minutes. After the reaction, the feed liquid is settled and filtered ...

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Abstract

The invention relates to a method for producing defluorinated sulfenyl nitrogen-phosphorus-potassium compound fertilizer, which belongs to the technical field of production in the chemical industry. The method comprises the following steps of: firstly, adding soluble sylvite (or sodium salt) into fluosilicic acid in wet phosphoric acid to generate potassium fluosilicate (or sodium fluosilicate) precipitate, wherein after separating the potassium fluosilicate (or sodium fluosilicate) precipitate, the potassium fluosilicate (or sodium fluosilicate) precipitate is used as byproduct; then mixing the defluorinated wet phosphoric acid with converted potassium bisulfate at low temperature, carrying out neutralization reaction on mixed acid and gas ammonia; and granulating, drying, sieving, cooling and packing the neutralized slurry to prepare the defluorinated sulfenyl nitrogen-phosphorus-potassium compound fertilizer. The invention is mainly used for producing chemical fertilizers.

Description

technical field [0001] The invention relates to a production method of defluorinated sulfur-based nitrogen, phosphorus and potassium compound fertilizer, which belongs to the technical field of chemical production. Background technique [0002] Since Shandong Linyi Chemical General Factory successfully produced sulfur-based compound fertilizers with the invention patent "Production Method of Potassium Sulfate Type Ternary Compound Fertilizer" (application number: 93111207.9) in Document 1, the production of sulfur-based compound fertilizers produced by this process in my country The scale has reached more than 10 million tons / year. The core process of the production process is: use concentrated sulfuric acid and potassium chloride to convert at low temperature to produce potassium bisulfate, mix potassium bisulfate with wet-process phosphoric acid and neutralize it with ammonia, and the neutralized slurry is granulated, dried and sieved Separation, cooling and other processe...

Claims

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Application Information

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IPC IPC(8): C05G1/06
Inventor 张朝森胡兆平李新柱张西兴刘永秀
Owner SHANDONG HONGRI ACRON CHEM
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