METHOD FOR PREPARING POTASSIUM MINERAL FERTILIZERS BASED ON CLINOPTILOLITE Russian patent published in 1994 - IPC

FIELD: chemical industry and agriculture. SUBSTANCE: clinoptilolite is treated with a sewage water in a module consisting of two columns connected to each other in sequence. The sea water is passed through the first column at a temperature of T₁ until the equilibrium on potassium is attained with the source water. Potassium concentrate is obtained by regeneration of the first column with the sea water heated to a temperature of T₂. A finished product is obtained by passing the concentrate, cooled to the temperature of T₁, through the second column until the equilibrium with the concentrate is attained. The processing temperature is chosen in correspondence with the consideration 50 C 50^°C<T₂-T₁<70^°C 170 C. The relationship of clinoptilolite volumes in the first and second columns is chosen to be (2-3): 1. EFFECT: improved quality of finished product. 2 tbl, 2 dwg