Method and device for removing SO2 in smoke gas by pyrolusite slurry and resource utilization

Abstract

The invention discloses a Method and device for removing SO2 in smoke gas by pyrolusite slurry and resource utilization. Pyrolusite is subjected to wet milling with water added by a ball mill and pH value regulation to prepare pyrolusite slurry; the pyrolusite slurry performs inverse contact reaction with SO2-containing smoke gas in a desulfurizing tower for desulfurization; the smoke gas is subjected to defogging, and then enters the next work procedure; the ore slurry circulation flow process comprises the steps of vacuum filtering, filtering after pH regulation by lime, pH regulation of filter liquid and precipitation in a precipitation pool, vacuum evaporative crystallization and solid-liquid separation, and filter liquid carbonization solid-liquid separation. The pyrolusite slurry is used for removing SO2 in the smoke gas; meanwhile, the SO2 takes oxidation-reduction reaction with manganese dioxide in the pyrolusite to generate manganous sulfate; through the processes of purification, evaporative crystallization, mother liquid carbonization and the like, manganese sulfate monohydrate and manganese carbonate with high added values can be obtained; the SO2 in the smoke gas is controlled; the secondary pollution of the smoke gas is prevented; meanwhile, high-added-value products are generated; meanwhile, the SO2 control problem is solved; the economic benefits are obtained.

Description

technical field [0001] The invention relates to a method for removing SO in flue gas from pyrolusite 2 The method and device for resource utilization thereof, to achieve the purpose of pollution control with raw ore, and to obtain high value-added products at the same time, belong to the technical field of environmental protection. Background technique [0002] Flue gas desulfurization methods can be roughly divided into dry desulfurization and wet desulfurization according to the phase of desulfurization agent. At present, there are more than 200 kinds of flue gas desulfurization technology processes at home and abroad, and there are only more than ten kinds of processes and supporting equipment with industrial application value. Wet desulfurization is the most commonly used because of its simple operation and low cost. In the wet desulfurization technology, although the lime-limestone method is the most mature technology at present, the desulfurization efficiency of this...

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Problems solved by technology

In the wet desulfurization technology, although the lime-limestone method is the most mature technology at present, the desulfurization efficiency of this process is high (the desulfurization rate is above 90%), the absorbent is cheap and the source is wide, but its system is complicated, the investment and energy consumption are large, and the production The application value of the waste residue is not great, and it is easy to cause secondary pollution; although the by-products of the ammonia water absorption method (amic acid method) can be used as fertilizer, it is accompanied by ammonia volatilization loss during desulfurization, and is limited by the ammonia source; other sodium methods or double The cost of the alkaline process is also high, and the value of the by-products is not very valuable. The enterprise is under great economic pressure. With the improvement of environmental protection regulations, it is imperative to find new desulfurization processes and equipment.

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