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Method for producing water-soluble potassium ammonium phosphate from wet-process phosphoric acid

A technology of wet-process phosphoric acid and potassium ammonium phosphate, which is applied in the direction of chemical instruments and methods, phosphorus compounds, silicon halide compounds, etc., can solve the problems of reducing the yield of potassium, and achieve the effect of improving purity, high purity, and high potassium content

Active Publication Date: 2013-04-03
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantages are: 1. During the reaction with phosphate rock powder, a large amount of potassium is entrained by phosphogypsum and precipitated in the form of potassium-containing phosphogypsum, which greatly reduces the yield of potassium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]A kind of wet-process phosphoric acid produces the method for water-soluble potassium ammonium phosphate, comprises the steps:

[0046] (1) Take 8,000 kg of wet-process phosphoric acid, first add 214 kg of phosphate rock powder, and stir for 3 hours at a temperature of 40°C; then, add 201 kg of potassium chloride at the same temperature, react for 2 hours, separate the solid and liquid, and take the liquid , 8019 kilograms of defluorophosphoric acid were obtained; after analysis, the components in the defluorophosphoric acid were as follows, all in percent by weight:

[0047] P 2 o 5 22.10%, F 1.16%, SO 3 1.18%, CaO 0.55%, MgO 0.73%, Fe 2 o 3 0.50%, Al 2 o 3 1.04%, SiO 2 0.52%, the balance of water and other impurities.

[0048] After solid-liquid separation in this step, the precipitate is a mixture of phosphogypsum and potassium fluorosilicate, totaling 506 kg.

[0049] (2) Introduce ammonia gas into the defluorophosphoric acid prepared in step (1) for ne...

Embodiment 2

[0055] A kind of wet-process phosphoric acid produces the method for water-soluble potassium ammonium phosphate, comprises the steps:

[0056] (1) Take 8,000 kg of wet-process phosphoric acid, first add 249 kg of phosphate rock powder, and stir for 1 hour at a temperature of 70°C; then, add 221 kg of potassium chloride at the same temperature, react for 0.5 hours, separate the solid and liquid, and take the liquid , 7,924 kilograms of defluorophosphoric acid were obtained; after analysis, the components in the defluorophosphoric acid were as follows, all in percent by weight:

[0057] P 2 o 5 22.18%, F 0.86%, SO 3 0.85%, CaO 0.95%, MgO 0.74%, Fe 2 o 3 0.52%, Al 2 o 3 1.03%, SiO 2 0.26%, the balance of water and other impurities.

[0058] After solid-liquid separation in this step, the precipitate is a mixture of phosphogypsum and potassium fluorosilicate, totaling 546 kg.

[0059] (2) Introduce ammonia gas into the defluorophosphoric acid prepared in step (1) for...

Embodiment 3

[0065] A kind of wet-process phosphoric acid produces the method for water-soluble potassium ammonium phosphate, comprises the steps:

[0066] (1) Take 8,000 kg of wet-process phosphoric acid, first add 249 kg of phosphate rock powder, and stir for 1 hour at a temperature of 60°C; then, add 241 kg of potassium chloride at the same temperature, react for 1 hour, separate the solid and liquid, and take the liquid , 7,806 kilograms of defluorophosphoric acid were obtained; after analysis, the components in the defluorophosphoric acid were as follows, all in percent by weight:

[0067] P 2 o 5 22.20%, F 0.85%, SO 3 0.88%, CaO 0.97%, MgO 0.78%, Fe 2 o 3 0.55%, Al 2 o 3 1.09%, SiO 2 0.20%, the balance of water and other impurities.

[0068] After solid-liquid separation in this step, the precipitate is a mixture of phosphogypsum and potassium fluorosilicate, totaling 543 kg.

[0069] (2) Introduce ammonia gas into the defluorophosphoric acid prepared in step (1) for ne...

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Abstract

The invention relates to a method for producing water-soluble potassium ammonium phosphate from wet-process phosphoric acid. According to the method, a monoammonium phosphate solution is prepared from low-cost wet-process phosphoric acid as the raw material by the steps of desulfuration and defluorination and neutralization with ammonia; then the replacement reaction of the monoammonium phosphate solution and potassium chloride and the crystallization are carried out to obtain a water-soluble fertilizer which contains potassium dihydrogen phosphate as a main component and adopts ammonium dihydrogen phosphate as an auxiliary component, wherein the content of chlorine is smaller than 2%; and excess potassium chloride and nitrogen produce a by-product such as nitrogen phosphorus and potassium chloride water soluble compound fertilizer. Meanwhile, the by-product in the production process can be directly used as a citric acid soluble phosphatic fertilizer. The method has simple processes, and the prepared water-soluble ammonium potassium dihydrogen phosphate is high in purity, nutrient and potassium content. No waste residues are discharged in the whole process, so that the method is environment-friendly and has better social and economical benefits.

Description

technical field [0001] The invention relates to a method for producing water-soluble potassium ammonium phosphate by 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. Compared with potassium dihydrogen phosphate or monoammonium phosphate and diammonium phosphate, it has more nutrients and is a fully water-soluble High concentration ternary compound fertilizer....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45C05G1/00C05G1/06C01B33/10
Inventor 张敏李新柱张营刘鹏王伯通王娜杨位红张国栋
Owner KINGENTA ECOLOGICAL ENG GRP
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