DOUBLE COBALT-MANGANESE HYDROPHOSPHATES AND PROCESS FOR PREPARING THEREOF Russian patent published in 1995 - IPC

FIELD: agriculture. SUBSTANCE: double cobalt-manganese hydrophosphates of the general formula: Co_1-xMn_xHPO₄·1,5H₂O, wherein 0<X≅ 5,5, used as fungicides having prolonged activity. Reagents used for preparing these salts include a 40-80% phosphoric acid solution, a mechanical mixture of cobalt and manganese hydroxocarbonates at a Co to Mn ratio of (10-1,5):1 and a 20-30% hydrogen peroxide solution. Reactants are fed under continuous agitation at a hydroxocarbonate mixture to H₂O, weight ratio of (5-3):1, respectively to a reactor thermostated at 25-60 C. The reactor contains water acidified with phosphoric acid and the pH of the reaction mixture is maintained constant at 2.6 to 3.2. The resulting precipitate is removed by filtration, washed with water and dried. EFFECT: improved properties of the title compounds. 3 cl, 5 tbl