| abstract |
The invention relates to the preparation of granular double superphosphate and can be used in agriculture. The purpose of the invention is to increase the crumbliness of the finished product while reducing the consumption of surface-active substances (surfactants). Cn includes the processing of phosphate raw materials with phosphoric acid in the presence of surfactants, which are pre-mixed with a suspension of calcium sulfate crystalline hydrate in phosphoric acid in an amount that ensures their content in the crystalline hydrate is 0.02-0.2%. Anionic compounds of a number of alkylarylsulfonic acids or their salts are used as surfactants. The suspension of calcium sulfate crystalline hydrate in phosphoric acid, after adding the surfactant to it, is held for 1-5 minutes. 1 hp f-ly, 1 tab. |