A method of obtaining a slow-acting complex fertilizer based on a urea-formaldehyde polymer

摘要

A method of producing a slow-acting complex fertilizer based on a urea-formaldehyde polymer, characterized in that, in order to intensify production and improve the agrochemical properties of the fertilizer, orthophosphoric acid is added to wastewater containing dissolved formaldehyde and a urea-formaldehyde resin to pH = 2.0, is introduced urea in a molar ratio of formaldehyde: urea equal to 1.0: 1.5, and the resulting mixture is kept for 3.5-4.0 hours, the resulting n is filtered and dried under natural conditions Leamer, which is mixed with ash, bringing KO content to 10% by weight.