Method for catalytic oxidation of calcium sulfite in desulphurization ash by dry method and semi-dry method

Abstract

The invention relates to a method for the catalytic oxidation of calcium sulfite in desulphurization ash by a dry method and a semi-dry method, which is carried out according to the following steps: (a) preparing a manganese salt solution with the concentration of 0.2-4%; (b) adding the manganese salt solution into desulphurization ash proportionally; (c) taking a hydrogen peroxide solution with the concentration of 1-10% and adding into the mixture of the manganese salt solution and the desulphurization ash proportionally; and (d) keeping the temperature of the mixture of the desulphurization ash, the manganese salt solution and the hydrogen peroxide solution and digesting for 0.5-2 hours. The invention uses manganese salt and hydrogen peroxide as a catalyst and an oxidant to oxidize the calcium sulfite in the desulphurization ash and has simple method, low implementation cost and easy realization. The invention can enhance the oxidation speed and limit of the calcium sulfite, solves the adverse effect of the instability caused by the slow oxidation of the calcium sulfite in air on the quality of an autoclaved brick and provides an approach which is easy to realize for the mass utilization of the desulphurization ash.

Description

technical field [0001] The invention relates to an ash treatment method, in particular to a method for catalytic oxidation of calcium sulfite in dry and semi-dry desulfurization ash. Background technique [0002] With the rapid development of industry, the problem of environmental pollution has become more and more prominent. At present, the control and governance of harmful gas pollution such as nitrogen oxides and sulfur dioxide in flue gas are becoming more and more intensive. Flue gas desulfurization methods include wet method, dry method and semi-dry method. The dry method and semi-dry method flue gas desulfurization process has the advantages of compact structure, small footprint, low power consumption and water consumption, small primary investment, low operating cost, and no With the advantages of wastewater discharge, it is widely used in water-scarce areas, small units, and old unit renovations, and has good technical and economical efficiency. However, the dispos...

AI Technical Summary

Problems solved by technology

[0003] The present invention is used to solve the problems of the above-mentioned prior art and provides a method for catalytic oxidation of calcium sulfite in dry and semi-dry desulfurization ash, which can accelerate the oxidation process of calcium sulfite in dry and semi-dry desulfurization ash , to solve the problem of instability of calcium sulfite in the production of autoclaved bricks using dry semi-dry desulfurization ash