The Mechaism and Practic of the Leaching Art of Carbamate Solution to Low Grade Manganese Ores Chen yanming;Yi BingbingIn this paper, thermodynamical analysis have been made to the lehaviour of Mn(Ⅱ) in carba-mate solution and detailed inverstigations on the application of carbamate solution to Hua yuan man-ganese mine. The results show that at 650℃ ruducing roast the ores for 1hr. the reduced ore material areleaching for 20 min. in carbamate solution mixture composed of ammonia, {N}=16, admixedwith carbon dioxide {C}=3. All the manganese may be into the lixiviant. The final product Mn-CO_3 contains 42.8% Mn. The manganese over-all recovery is more than 91%Carbamate;;Hydrometallugy;;Lixiviant;;Ternary system