Method for removing sulfur dioxide in smoke by using manganese carbonate ore and preparing manganese sulfate solution

Abstract

The invention provides a method for removing sulfur dioxide in smoke by using manganese carbonate ore and preparing a manganese sulfate solution. The method comprises the following steps: (1) introducing smoke comprising the sulfur dioxide into an absorption apparatus with manganese carbonate ore slurry, controlling a flow rate of the smoke at 1 to 4.5 m<3> / s, controlling a liquid-gas ratio of theore slurry to the smoke at 12 to 35 L / m<3>, performing the reaction, obtaining slurry and discharged smoke, wherein the concentration of sulfur dioxide in the smoke reaches the environment-friendly emission requirement; and (2) introducing oxide gas into the slurry after step (1), reacting for 1 to 4 hours, after the reaction is ended, filtering, removing the filter residue, removing impurities of the filtrate, and obtaining a manganese sulfate solution. By adopting the method of the invention, the whole reaction process is easy to control. The method has the advantages of energy conservation, environmental protection, good smoke desulphurization effect, low production cost and the like and is easy in industrialized and continuous production.

Description

technical field [0001] The invention belongs to the intersecting technical field of hydrometallurgy and environmental protection, and in particular relates to a method for removing sulfur dioxide in flue gas and preparing manganese sulfate solution by using manganese carbonate ore powder. Background technique [0002] Wet flue gas desulfurization has been widely used in coal-fired power plants and small and medium-sized coal-fired boilers, and has become the leading desulfurization technology adopted by coal-fired power plants in the world today. At present, in coal-fired power plants at home and abroad, wet flue gas desulfurization accounts for about 85% of the total flue gas desulfurization, and there is an increasing trend year by year. In the wet flue gas desulfurization of coal-fired power plants at home and abroad, the limestone / lime-gypsum method and the limestone / lime discarding method account for about 83% of the total flue gas desulfurization. The environment does...

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Problems solved by technology

[0003] In recent years, only a small number of documents and patent applications have proposed a process technology that combines flue gas desulfurization with manganese sulfate production. These processes are mainly divided into two types: one is wet desulfurization with manganese dioxide ore powder, and porous Plate tower, turbulent ball tower, packed tower, jet bubbling tower, spray tower and other commonly used chemical gas absorption towers are used as reactors to make the flue gas containing sulfur dioxide react with manganese dioxide raw materials in the absorption tower, and the absorption effect is very good. Well, the content of sulfur dioxide gas after absorption is far lower than the national environmental protection emission standards; but the manganese dioxide slurry in this type of method will gradually block in the tower after running for a period of time, and the air flow channel in the tower will continue to shrink, which will affect the long-term and long-term operation of the process. Continuous and stable; and in the process of absorbing sulfur dioxide by using manganese dioxide ore powder slurry, the pH value of the absorption slurry is mostly lower than 3.5, which causes great corrosion to the equipment; at the same time, a large amount of manganese dithionate that is difficult to eliminate is produced, which seriously affects the desulfurization process Application in industrial production

The other is to use manganese carbonate ore powder as a neutralizing agent in the aforementioned process to maintain the pH value of the absorption slurry to ensure absorption efficiency. Manganese carbonate manganese powder is not the main material of the desulfurizer; therefore, the defects in the aforementioned process are in this process Still exist

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