Question: How can compound fertilizers be made fully water-soluble, such as 17-17-17?
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: How can compound fertilizers, such as 17-17-17, be fully water-soluble? I used a pressure of 60, and there was still residue left. How can I reduce the amount of residue? Drum granulation, or granulation using dilute sulfuric acid and urea. Is it necessary to choose a type that leaves no residue when pressed? Thank you for the advice
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Industrial monoammonium phosphate without residues, with a 73% content, is easily available on the market; it’s just a bit more expensive
From a formulation perspective, for fully water-soluble fertilizers, it is first necessary to avoid the use of ammonium chloride as well as ordinary and supercalcium phosphate; ammonium dihydrogen phosphate must be of high-quality, fully water-soluble variety. It’s just not clear what the cost will be or what the profit margins will be
Firstly, there is something problematic with the way the original poster phrased this. Currently, water-soluble fertilizers in China are hardly produced using granulation methods; such fertilizers are generally required to dissolve quickly, and granulation significantly reduces their dissolution rate. Secondly, water-soluble fertilizers and compound fertilizers are two different concepts, and they follow different standards; therefore, their formulations are not comparable at all. From what the poster said, it can be seen that they are involved in the production of compound fertilizers and know very little about water-soluble fertilizers. Finally, water-soluble fertilizer formulas hardly rely on the same raw materials as those used in compound fertilizers; the materials used are mostly of industrial grade. Some high-end products contain large amounts of chelated trace elements and plant growth regulators to ensure their superior fertilizing efficiency, a feature that compound fertilizers cannot match.
Besides the issue of raw materials, what other challenges do water-soluble fertilizers face?
This post was last edited by qinxuyou on 2011-4-19 at 15:23. It is recommended that fully water-soluble compound fertilizers be in crystalline form. It is prepared using ordinary phosphoric acid or ammonium phosphate; the remaining mother liquor is supplemented with nutrients before being used for slurry spraying and granulation. It might be cheaper than buying industrial ammonium phosphate.
Is there any filler in the residue left after the dissolution of the drum compound fertilizer?
Some manufacturers are already engaged in full-water-soluble high-tower granulation; Guizhou Kailin is one of them