METHOD FOR PREPARING MAGNESIUM COMPOUND FROM FERRONICKEL SLAG

摘要

The present invention relates to a method for preparing a magnesium compound from ferronickel slag, which makes the slag and a hydrochloric acid solution undergo a plurality of reaction steps continuously, and allows a final slag treatment step for preparing magnesium hydroxide, after extraction of silica and magnesia, to be carried out continuously, not discontinuously. The method for preparing a magnesium compound from ferronickel slag according to the present invention comprises: an acid treatment step in which a hydrochloric acid solution and additives are added to the slag to carry out reaction; a reaction step in which the primary slurry formed in the acid treatment step is allowed to react to produce reactive slurry; a solid-liquid separation step in which the reactive slurry produced from the reaction step is filtered to be separated into a solid and filtrate; a silica separation step in which silica is separated from the solid; a purification step in which impurities are removed from the filtrate to obtain a magnesium chloride solution; a magnesia separation step in which the magnesium chloride solution is concentrated and pyrolyzed so that magnesia may be separated therefrom; and a magnesia reaction step in which the separated magnesia is allowed to react with water to obtain magnesium hydroxide.;COPYRIGHT KIPO 2017