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Method for producing polymeric phosphorus-containing compound fertilizer by using citric acid-soluble phosphorus slag

A compound fertilizer, citric acid-soluble technology, applied in fertilizer mixtures, solid/semi-solid fertilizers, applications, etc., can solve problems such as high equipment requirements, complex processes, and large consumption of water resources, so as to prolong fertilizer efficiency, increase phosphorus content, and improve The effect of product quality

Active Publication Date: 2022-04-15
YUNNAN YUNTIANHUA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of method that utilizes citrate soluble phosphorus slag to produce the compound fertilizer containing polymerized phosphorus, solves existing technology to equipment requirement high, technology is complicated and needs The problem of consuming large amounts of water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take an ammonium phosphate filter residue, dry base nutrient composition N: 6.96%, total P 2 O 5 : 36.71%, effective P 2 O 5 : 34.01%, water soluble P 2 O 5 Popular P 2 O 5 The content is 29.21%; phosphoric acid is wet phosphoric acid, P 2 O 5 : 25.12%.

[0028] The 1200 g of a phosphate is mixed with 800 g of phosphoric acid in a mixed apparatus, and the residue is obtained, and the solid content is 63.0%, and 465 g of urea is added to the slag, the temperature is 100 ° C, neutralized and reacted for 65 minutes to obtain phosphorus residue. And slurry, poultry and slurry to the high temperature synthesizer, and add 480 g of potassium sulfate for synthesis, the reaction temperature is 190 ° C, the reaction time is 90 min, after cooling and crushing, 527 g of polymerized phosphorus compound fertilizer 2527g, Nutrient groups be: N: 9.97%, effective P 2 O 5 : 25.27%, water P 2 O 5 : 20.41%, K 2 O: 9.49%, pH: 6.7, mean polymerization 4.52. Among them, water solubility P 2 O 5 P...

Embodiment 2

[0031] Take an ammonium phosphate filter residue, dry base nutrient composition N: 6.96%, total P 2 O 5 : 36.71%, effective P 2 O 5 : 34.01%, water soluble P 2 O 5 Popular P 2 O 5 The content is 29.21%; the phosphoric acid is a wet purified phosphatic acid by extract of extract, P 2 O 5 : 45.61%.

[0032] An ammonium phosphate is mixed with 900 g of phosphoric acid in a mixed apparatus, and the residue is obtained, and the solid content is 58.5%, and 720 g of urea is added to the residue, the temperature is 10 ° C, neutralized and reactive for 50 min to obtain phosphorus residue. And slurry, poultry and slurry to the high temperature synthesizer while adding 240 g of potassium nitrate to perform synthesis reactions, the reaction temperature is 175 ° C, the reaction time is 120 min, after cooling and crushing, obtaining a polymer phosphorus compound fertilizer 2360G, Nutrient groups be: N: 15.23%, effective P 2 O 5 : 33.29%, water-soluble P 2 O 5 : 28.28%, K 2 O: 5.08%, pH 6.6, the a...

Embodiment 3

[0035] Take an ammonium phosphate filter residue, dry base nutrient composition N: 6.96%, total P 2 O 5 : 28.82, effective P 2 O 5 : 26.70%, water soluble P 2 O 5 Popular P 2 O 5 The content is 24.34%; the phosphoric acid is a wet purified phosphatic acid by-product acid, P 2 O 5 : 38.76%.

[0036] 600 g of a ammonium phosphate filter residue was mixed with 1400 g of phosphoric acid in a mixed apparatus, and the residue was produced, and the solid content was 36.3%, and 770 g of urea was added to the slag, the temperature was 105 ° C, neutralized and reacted for 60 min to obtain phosphorus residue. And slurry, poultry and slurry to the high temperature synthesizer while adding 480 g of potassium chloride to perform synthesis reactions, the reaction temperature is 165 ° C, the reaction time is 100 min, after cooling and crushing, resulting in polymer phosphorus compound fertilizers 2882G The nutrient group is: N: 9.84%, effective P 2 O 5 : 24.42%, water-soluble P 2 O 5 : 22.50%, K ...

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Abstract

The invention discloses a method for producing a polymeric phosphorus-containing compound fertilizer by using citric acid-soluble phosphorus slag, and relates to the technical field of polymeric phosphorus-containing compound fertilizer production. The method comprises the following steps: uniformly mixing citric acid-soluble phosphorus slag with phosphoric acid to prepare slag slurry with the solid content of 30-70%; adding urea into the slag slurry, heating to 80-130 DEG C, and stirring to react for 45-90 minutes to obtain neutralized slurry; adding a potassium source into the neutralized slurry, heating to 130-250 DEG C, and carrying out synthetic reaction for 30-150 minutes to obtain an initial product of the polymeric phosphorus-containing compound fertilizer; and cooling and crushing the initial product, and granulating to obtain a granular polymeric phosphorus-containing compound fertilizer finished product. The water-soluble P2O5 in the obtained finished product accounts for more than 75% of the effective P2O5 content, the polymerized P2O5 accounts for more than 35% of the effective P2O5 content, and the pH value of the product is 6-8. The method is simple in process, high in operability, free of waste in the process and environmentally friendly, and provides an effective way for efficient recycling of the citrate-soluble phosphorus slag.

Description

Technical field [0001] The present invention relates to the field of polymerized phosphorus compound fertilizer production, and more particularly to a method of producing polymeric phosphorus compound fertilizers using osolic phosphorus. Background technique [0002] In a phosphate fertilizer, it is difficult to dissolve or slightly soluble in water, but can be extracted by a neutral citrate solution or a phosphorus extracted with C (EDTA) = 0.2 mol / L solution, referred to as osteolytic phosphorus. Isolate phosphor is directly applied to the soil, and the root system is required to secrete the weak acid. After dissolving, it can be absorbed by plant, not only low, but also the fertilizer, not conducive to agricultural applications. In recent years, as the market has increased the demand for high quality composites, water-soluble fertilizer demand, the phosphorus compound fertilizer production process will accompany different by-products depending on the production of products. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G5/12
Inventor 舒艺周马航杨先杨东白正斌匡家灵
Owner YUNNAN YUNTIANHUA
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