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Method for producing powdery monoammonium phosphate by phosphoric acid by wet method in step way

A technology of monoammonium phosphate and wet-process phosphoric acid, applied in the field of ammonium phosphate, can solve the problems of incomplete digestion of filter residues, no mention of filter residue treatment methods, etc., and achieve the effects of easy operation control and simple process flow

Inactive Publication Date: 2017-05-31
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

None of the above-mentioned 3 patent technologies mentions the treatment method of the filter residue, and there is still the problem that the filter residue cannot be fully digested

Method used

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  • Method for producing powdery monoammonium phosphate by phosphoric acid by wet method in step way

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Effect test

Embodiment 1

[0017] The mass fraction of wet-process phosphoric acid obtained after dihydric sulfuric acid extraction of phosphate rock is 24.1%. Phosphate rock powder is added to it for desulfurization. The amount of phosphate rock powder is 4.2% of the phosphoric acid amount. Introduce gaseous ammonia, the pH of the pre-neutralization process is 2.6, age for 2 hours, and filter after standing for 2 hours. And after drying, a powdered monoammonium product with high nutrient content is obtained, and the effective P of the product 2 o 5 The content is 54.3%, water-soluble P 2 o 5 The N content is 53.9%, the N content is 12.1%, and the total nutrient content is 66.4%. At the same time, re-slurry the pre-neutralized filter residue with dilute phosphoric acid, the volume ratio of the filter residue to dilute phosphoric acid is 1:1, after re-slurry, add gas ammonia again, and the final pH value of the ammoniation process is 4.8 , After the slurry is concentrated, it enters the drying proces...

Embodiment 2

[0019] The mass fraction of wet-process phosphoric acid obtained after dihydric sulfuric acid extraction of phosphate rock is 25.2%. Phosphate rock powder is added to it for desulfurization. The amount of phosphate rock powder is 5.4% of the phosphoric acid amount. Introduce gaseous ammonia, the pH of the pre-neutralization process is 3.0, age for 1 hour, and filter after standing for 1 hour. The filtrate is passed in gaseous ammonia again, and the pH value of the secondary ammoniation process is 4.7. After the reaction, the slurry is concentrated And after drying, a powdered monoammonium product with high nutrient content is obtained, and the effective P of the product 2 o 5 The content is 55.6%, water-soluble P 2 o 5 The N content is 55.2%, the N content is 12.2%, and the total nutrient content is 67.8%. At the same time, reslurry the pre-neutralized filter residue with dilute phosphoric acid. The volume ratio of filter residue to dilute phosphoric acid is 0.9:1. After re...

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Abstract

The invention relates to a method for producing powdery monoammonium phosphate from phosphoric acid by a wet method in a step way. The method comprises the steps of (1) dilute phosphoric acid preneutralization treatment: dilute phosphoric acid is used as raw materials; powdered rock phosphate desulfating radicals are added; filtering is performed; then, ammonia gas is introduced into filter liquid; stirring is performed; preneutralization reaction is performed; then, continuous stirring and aging are performed; still standing and settling are performed; filtering is performed again; filter slag and filter liquid containing monoammonium phosphate are obtained; (2) powdery monoammonium phosphate preparation in the step way: at a first stage, gas ammonia is introduced into the filter liquid again; the pH is controlled; after ammonization, slurry is concentrated and dried; a product with the total nutrient being 66 percent to 68 percent is obtained; at a second stage, the filter slag obtained in the first stage is prepared into slurry by the dilute phosphoric acid in a slurrying tank and then enters a reactor; the gas ammonia is introduced; the pH is controlled; finally, the slurry is concentrated and dried; a product with the total nutrient being 58 percent to 59 percent is obtained. The method has the advantages that the flow process is simple; the operation control is easy; the existing powdery monoammonium phosphate device can be directly modified. The method is applicable to ammonium phosphate production enterprises.

Description

technical field [0001] The present invention relates to ammonium phosphate, and more particularly to a method for monoammonium phosphate produced by wet-process phosphoric acid. Background technique [0002] The traditional production process of powdered monoammonium phosphate is to neutralize wet-process phosphoric acid with ammonia, then use slurry concentration and spray drying. The total nutrient content (mass fraction) of powdered monoammonium has three grades: 55%, 58% and 60%. As of 2016, the powdered monoammonium phosphate with a nutrient content of 60% or less has serious overcapacity, and the market still has demand for powdered monoammonium phosphate with a high nutrient content (greater than or equal to 64%). In the current journal literature and patents, the main method of producing high-nutrient monoammonium phosphate is generally wet-process phosphoric acid, which is neutralized twice and filtered twice. The N content of the filter residue is low, and ammoniu...

Claims

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Application Information

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IPC IPC(8): C01B25/28
CPCC01B25/28
Inventor 李红林赵建勇徐春王权顶田仁道张洪绪缪钊刘贵兰
Owner WENGFU (GRP) CO LTD