METHOD OF PRODUCING COMPOUND FERTILIZER Russian patent published in 1999 - IPC

FIELD: production of fertilizers for agriculture with use of wastes of industrial enterprises, in particular, blast-furnace slags and spent solutions of synthetic rubber plant. SUBSTANCE: method includes treatment during mixing of ground blast-furnace slag with spent aqueous solution of synthetic rubber production containing, wt.%: Cu²⁺, 10-20; NH₃, 10-15; CH₃COO^-, 5-10; water, the balance; pH, 11-12; slag- solution ratio is (25-30):1 and subsequent mechanical activation. Used in the claimed method is slag ground to particles sizing not more than 5 mm and mechanical activation is carried out to obtain particles sizing within 2 mm. Process of mixing of components provides for mixture heating up to 60 C. EFFECT: higher efficiency of fertilizer, prolonged storage life and wide range of service. 4 cl, 1 tbl