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Fertilizer Agglomeration Mechanism I

2019-05-31

Only by correctly understanding and mastering the causes of compound fertilizer agglomeration can appropriate measures be taken to prevent fertilizer agglomeration. After observing and studying the surface of the particles by electron microscopy and X-ray diffraction, crystal bridging theory and capillary adsorption theory are generally accepted.
1) Crystal bridge theory
According to Crystal Bridge Theory, due to its own changes (crystal characteristics, chemical composition, particle size, particle size distribution, crystal geometry) and external conditions (humidity, temperature and pressure), moisture continuously diffuses from the inside to the surface (or Due to surface moisture absorption), the surface of the particles dissolves and recrystallizes, forming a crystal bridge at the interstices of the particles. Over time, the crystal bridges combine to form large clumps.
(2) Capillary adsorption theory
The theory holds that the hygroscopic fertilizer is at its critical relative humidity (also known as the hygroscopic point, referred to as crh) and uses it to indicate the hygroscopicity of the fertilizer. That is, at a certain temperature, when the fertilizer loses moisture, it begins to absorb moisture into the air or air. In relative humidity. It absorbs the water above and forms a saturated solution film of the fertilizer on the surface of the crystal. The membrane of this solution accelerates the adsorption of the capillary. The saturated vapor pressure of the capillary surface water is lower than the external saturated vapor pressure. External water vapor diffuses between the particles, absorbing moisture and deliquescent. The concave surface formed by the surface tension causes ions to move toward the particles. Move to the point of contact so that adjacent particles form and combine into clusters.
Crystal bridge theory and capillary adsorption theory can explain the agglomeration of many inorganic compounds. They all think that the reason for the agglomeration of the fertilizer is that the surface dissolves and recrystallizes, so that the fine particles combine into clusters.

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