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Method for producing water-soluble ammonium potassium phosphate fertilizer with wet-method phosphoric acid

A technology of wet-process phosphoric acid and potassium ammonium phosphate, which is applied in the direction of fertilizer mixture, chemical instruments and methods, applications, etc., can solve the problems of reducing the yield of potassium, and achieve the effects of environmental protection, high purity, and low cost

Active Publication Date: 2013-04-10
KINGENTA NORSTERRA CHEM CO LTD
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  • Description
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Problems solved by technology

Although this method also uses wet-process phosphoric acid, and can simultaneously remove fluorine during the reaction process with phosphate rock powder, its disadvantages are: 1. During the reaction with phosphate rock powder, a large amount of potassium is entrained by phosphogypsum , precipitated in the form of potassium-containing phosphogypsum, greatly reducing the yield of potassium

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  • Method for producing water-soluble ammonium potassium phosphate fertilizer with wet-method phosphoric acid

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Experimental program
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Embodiment 4

[0027] The wet-process phosphoric acid in embodiment 4 and experimental example 4 is to adopt high-magnesium phosphate ore to make through sulfuric acid wet-process phosphoric acid, purchased from Guizhou Fuquan Company, after testing, the main components are as follows, all in weight percentage:

[0028] P 2 o 5 24.12%, F2.08%, SO 3 2.36%, CaO0.36%, MgO8.54%, Fe 2 o 3 0.31%, Al 2 o 3 0.57%, SiO 2 4.46%.

Embodiment 1

[0030] A method for producing water-soluble potassium ammonium phosphate fertilizer with wet-process phosphoric acid, the steps are as follows:

[0031] (1) In wet-process phosphoric acid, add potassium sulfate in a certain proportion, wherein the molar ratio of potassium sulfate and F in wet-process phosphoric acid is 1.2:6; control the temperature at 40°C, react for 1 hour, and separate solid and liquid to obtain filtrate A and Filter cake A; Wherein, filtrate A is defluorophosphoric acid, after analysis, the component in the defluorophosphoric acid is as follows, is weight percent:

[0032] P 2 o 5 22.16%, F1.46%, SO 3 1.53%, CaO0.13%, MgO0.73%, Fe 2 o 3 0.50%, Al 2 o 3 1.04%, SiO 2 0.32%, the balance of water and other impurities; filter cake A is potassium fluorosilicate.

[0033] (2) neutralize ammonia in the defluorophosphoric acid obtained in step (1), adjust the pH to 6.5 to control the end of the reaction, and obtain a slurry; separate the solid-liquid of the...

Embodiment 2

[0037] A method for producing water-soluble potassium ammonium phosphate fertilizer with wet-process phosphoric acid, the steps are as follows:

[0038] (1) In wet-process phosphoric acid, add potassium sulfate in a certain proportion, wherein the molar ratio of potassium sulfate to F in wet-process phosphoric acid is 1.4:6; control the temperature at 70°C, react for 1 hour, and separate solid and liquid to obtain filtrate A and Filter cake A; Wherein, filtrate A is defluorophosphoric acid, after analysis, the component in the defluorophosphoric acid is as follows, is weight percent:

[0039] P 2 o 5 22.14%, F1.15%, SO 3 1.73%, CaO0.10%, MgO0.79%, Fe 2 o 3 0.60%, Al 2 o 3 1.02%, SiO 2 0.29%, the balance of water and other impurities. Filter cake A is potassium fluorosilicate.

[0040] (2) Neutralize the defluorinated phosphoric acid obtained in step (1) with ammonia, adjust the pH to 6.0 to control the end of the reaction, and obtain a slurry; separate the solid-liqui...

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Abstract

The invention provides a method for producing a water-soluble ammonium potassium phosphate fertilizer with wet-method phosphoric acid. The method comprises the steps that low-cost wet-method phosphoric acid is taken as a raw material, subjected to defluorination, and neutralized with ammonia to form a monoammonium phosphate solution; the monoammonium phosphate solution conducts replacement reaction with potassium sulfate, and crystallized; and a water-soluble ammonium potassium dihydrogen phosphate fertilizer with main potassium dihydrogen phosphate and auxiliary ammonium dihydrogen phosphate is obtained. Excess potassium sulfate and nitrogen can produce a sulfur-based nitrogen, phosphorus and potassium water-soluble compound fertilizer, and byproducts in a production process can directly serve as a citric-soluble phosphoric fertilizer. The method is simple in technology, the prepared water-soluble ammonium potassium dihydrogen phosphate fertilizer has the advantages of high purity, high nutrient and high potassium content, no waste residue is discharged in the overall process, and the method is environment-friendly, and has better social and economic benefits.

Description

technical field [0001] The invention relates to a method for producing water-soluble potassium ammonium phosphate fertilizer with wet-process phosphoric acid, belonging to the technical field of chemical production. Background technique [0002] With the rapid development of my country's flower industry and garden ornamental industry, water-soluble fertilizers are gradually accepted by professional growers. In large-scale economic crop areas, water and fertilizer integration combined with drip irrigation systems can greatly save manpower and water resources, which also promotes the development of water-soluble fertilizers in China. Ammonium potassium dihydrogen phosphate is a composite crystal composed of potassium dihydrogen phosphate and ammonium dihydrogen phosphate in different proportions. It has more nutrients than potassium dihydrogen phosphate or monoammonium phosphate and diammonium phosphate. It is a fully water-soluble High-concentration ternary compound fertiliz...

Claims

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Application Information

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IPC IPC(8): C01B25/45C05G1/00
Inventor 李新柱胡兆平张敏王娜刘鹏邹士龙王震
Owner KINGENTA NORSTERRA CHEM CO LTD
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