Modified calcium-based desulfurizing agent for dry desulfurization of sintering gas and preparation method of modified calcium-based desulfurizing agent

Abstract

The invention discloses a modified calcium-based desulfurizing agent for dry desulfurization of sintering gas and a preparation method of the modified calcium-based desulfurizing agent. The desulfurizing agent comprises the following raw material components in weight percent: 85-95% of limestone, 2.5-10% of urban domestic sludge and 2.5-6% of anthracite duff. A preparation method comprises the following steps: 1) uniformly mixing the limestone, the urban domestic sludge and the anthracite duff according to the proportions for further use; and 2) roasting the mixed raw materials for 20-30 minutes at 1000-1100 DEG C, naturally cooling to normal temperature, and crushing the materials until the grain size is 0.1-0.2mm, thus obtaining the modified calcium-based desulfurizing agent for dry desulfurization of sintering gas. The modified calcium-based desulfurizing agent for dry desulfurization of sintering gas, prepared by using the preparation method disclosed by the invention, has the advantages that the desulfurization efficiency for the sintering gas is over 93 percent, the preparation process is simple, and the raw materials are wide in source and low in cost.

Description

technical field [0001] The invention relates to flue gas desulfurization technology, in particular to a modified calcium-based desulfurizer for dry desulfurization of sintering flue gas and a preparation method thereof. Background technique [0002] Calcium-based desulfurizers are widely used because of their low price and wide range of sources. As flue gas desulfurizers, commonly used calcium-based desulfurizers include lime, slaked lime, carbide slag, limestone, and dolomite. The activity of calcium-based desulfurizers is mainly determined by the particle size, specific surface area, pore size distribution of calcium-based desulfurizers, and the diffusion rate of reactants through the sulfide product layer. Therefore, even under the same Ca / S, different calcium The desulfurization efficiency of the base desulfurizer is different. The reactivity of the desulfurizer is one of the key factors affecting the effect of flue gas desulfurization. The higher the activity of the de...

AI Technical Summary

Problems solved by technology

In the process operation of desulfurizing sintering flue gas with calcium-based desulfurizer, the cost of desulfurizer accounts for a large proportion of the operation cost of flue gas desulfurization. In order to improve the desulfurization efficiency of calcium-based desulfurizer, the current common method is to use chemical solution Condition the calcium-based desulfurizer to optimize the digestion process and improve the characteristics of the digested product, thereby improving the microstructure of the calcium-based desulfurizer, reducing the diffusion resistance of the gas phase in the pores of the desulfurizer during the desulfurization process, and improving the desulfurization efficiency of the calcium-based desulfurizer However, the use of chemical solutions to temper desulfurizers has defects such as complex preparation process and high price. Therefore, the development of high-efficiency, low-cost, and wide-source desulfurizers is a common problem faced by the desulfurization industry.