Method for extracting manganese from manganese-enriched slag

Abstract

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.

Description

technical field [0001] The invention relates to a method for extracting manganese element from manganese-rich slag by wet method. Background technique [0002] Manganese-rich slag is the product of selective reduction of iron-manganese ore in a blast furnace or an electric furnace. Because the content of manganese is the largest (the mass percentage with a small content is also close to 30%, and the mass percentage is more than 40%), so it is often referred to as It is used as a raw material for the production of manganese-containing products or manganese metal. Wet leaching of manganese in manganese-rich slag is the main production method. The existing wet leaching mainly uses sulfuric acid, hydrochloric acid, etc. as leaching agents. Wait for the manganese salt solution, and then further precipitate and separate, or prepare a qualified electrolytic manganese solution containing manganese salt (which can further electrolyze metal manganese). In the process of preparing ma...

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Problems solved by technology

As a result, it will inevitably cause difficulties in the separation of manganese salts, affect the actual leaching rate of manganese, and at least make the subsequent separation process very complicated

In addition, there is also sulfur that should be removed in the manganese-rich slag (the mass percentage of the content is between 0.55 and 2.0%), and because the existing wet-leaching manganese-rich slag is actually an acid leaching manganese-rich slag, therefore, In the process of acid leaching manganese-rich slag, it can only be treated with hydrogen sulfide (H 2 S) released in the form of a gas

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