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Can potassium phosphite be produced in powder form?

Potassium phosphite is a fungicidal green fertilizer that also has some of the effects of a pesticide. It is usually synthesized by phosphite and potassium hydroxide, and currently most of the potassium phosphite appears in the form of aqueous solution. Often engaged in fertilizer compounding, processing friends often we ask us a question, whether potassium phosphite can be produced into powder? The reason for this may be that the powdered potassium phosphite has a higher content or is more convenient to use.


Because the potassium content of potassium phosphite is relatively high, in the late stage of synthesis, crystallization will be more difficult as the concentration of potassium ions rises, which is mainly due to the characteristics of compounds of inorganic potassium salts. If it must be made into powder, it will produce moisture absorption, agglomeration and other undesirable phenomena in the late stage, but on the contrary, it will have adverse effects on the use and preservation.


Therefore, potassium phosphite is usually made into 30~60% aqueous solution. The nature of aqueous solution is more stable, and it is more convenient to compound with trace elements. It should be noted that the quality of phosphite has a very important impact on the quality of potassium phosphite. At present, the quality of potassium phosphite produced from by-product phosphite is usually poor, and the effect of compounding with fertilizers containing copper, zinc, calcium, magnesium, boron and iron trace elements is also much worse.



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