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Method for preparing anhydrous ferric orthophosphate by microwave spouting

A ferric orthophosphate, shotcrete technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problem that the crystal water content is difficult to accurately control, the acidity of the reaction system is difficult to accurately control, and it is difficult to synthesize iron orthophosphate, etc. problems, to achieve the effect of reducing energy consumption, saving time and reducing investment

Active Publication Date: 2014-06-18
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ubiquitous problem of this liquid phase reaction is that the reaction process is long, the acidity of the reaction system is difficult to control accurately, and it is difficult to synthesize pure ferric orthophosphate
The process of this method is long, and the content of crystallization water is difficult to control very accurately, which brings many problems for subsequent applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] Mix 160 grams of ferric oxide with 301.5 grams of 65% phosphoric acid for 1 hour to form a uniform slurry, spray it into a high-temperature microwave oven under pressure, react at 800 ° C for 10 minutes, and cool to directly obtain 302 grams of shallow Yellow ferric orthophosphate, the product content reaches 99.6%.

example 2

[0017] Mix 80 grams of ferric oxide, 118.7 grams of 96% monoammonium phosphate and 60 grams of water for 2 hours to make a slurry, extrude and spray it into a high-temperature microwave oven, react at 600 ° C for 40 minutes, and cool , directly obtain 150 grams of light yellow ferric orthophosphate, and the product content reaches 99.2%.

example 3

[0019] Mix 81.6 grams of ferric oxide with 150.8 grams of 65% phosphoric acid for 2 hours to form a uniform slurry, spray it into a high-temperature microwave oven under pressure, react at 900 ° C for 7 minutes, cool, and directly obtain 151 grams of shallow Yellow ferric orthophosphate, the content of the product is 100%. Fe:P molar ratio is 1.02:1

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Abstract

The invention provides a method for preparing anhydrous ferric orthophosphate by microwave spouting, which relates to a preparation method of phosphates, in particular to a method for preparing anhydrous ferric orthophosphate by adopting a rapid heating and spouting technology. The method provided by the invention comprises the following steps of: mixing a phosphorus source and an iron source according to the chemical molar ratio of (0.98-1.02):(0.98-1.02); forming a uniform slurry by adopting a direct synthesis or liquid phase reaction mode; and spraying the slurry into a reaction device for reacting for 5-40 minutes at the reaction temperature of 600-1000 DEG C to generate the anhydrous ferric orthophosphate. The ferric orthophosphate product prepared by adopting the method provided by the invention has the advantages that the chemical element ratio approaches the theoretical value, and the crystal structure is normal. The preparation method greatly shortens the technical processes, reduces the investment and lowers the energy consumption.

Description

technical field [0001] The invention relates to a method for preparing phosphate, in particular to a method for preparing anhydrous ferric orthophosphate by adopting rapid heating and spraying technology. Background technique [0002] At present, the production method of ferric phosphate is mainly a liquid phase method, that is, the iron source or ferrous salt and phosphorus source are used as raw materials to carry out a liquid phase reaction. During the reaction, an alkaline regulator is added to keep the reaction at a certain acidity. Acidic or basic ferric phosphate is precipitated, and then filtered, washed and separated to adjust the iron / phosphorus ratio to obtain ferric phosphate products. The ubiquitous problem of this liquid-phase reaction is that the reaction process is long, the acidity of the reaction system is difficult to control accurately, and it is difficult to synthesize pure ferric orthophosphate. Moreover, the ferric phosphate prepared by the liquid pha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37
Inventor 赵海燕陈云建
Owner YUNNAN CHEM RES INST