Method for extracting manganese from manganese-enriched slag

The invention relates to a method for extracting manganese from manganese-enriched slag. In the method, the manganese-enriched slag is subjected to alkali leaching on the basis of taking sulfuric acid as a leaching agent. The method comprises the following steps of: putting the manganese-enriched slag into a stirring tank, and adding sodium hydroxide solution to perform the alkali leaching; 2, standing, precipitating, preparing into a filter cake, and washing by water to obtain desiliconized and desulfurized manganese-enriched slag; 3, putting the desiliconized and desulfurized manganese-enriched slag into a leaching tank to perform acid leaching; and 4, separating by suction filtration to prepare acid leaching solution containing manganese sulfate, wherein before the acid leaching is performed, the water and pyrolusite also can be added to oxidize sulfur in the manganese-enriched slag further. In the method, gel silicic acid can be prevented during desilicication, so the actual extracting rate of the manganese; and hydrogen sulfide gas can be prevented from generating and escaping during desulfurization to prevent the adverse effect on operators. The method also has the advantages that the operation is simple and convenient, various reaction conditions are easy to control, and the loss of manganese-enriched ores in the integral process is small.