Method for improving purity of desulfurizing agent for limestone gypsum wet desulphurization

Abstract

The invention discloses a method for improving the purity of a desulfurizing agent for limestone gypsum wet desulphurization, which comprises the following steps: in the production raw material grinding process, only allowing limestone to enter grinding equipment through a belt weigher, recording the moment as T, and when the purity of CaCO3 in raw material powder on a finished product trough is tested to be equal to the content of CaCO3 in limestone at a certain time interval, recording the moment as T+[delta]T1; after stopping feeding for [delta]T1, taking materials from a material taking point on the finished product trough to a desulfurizing agent bin of a slurry preparation unit; determining the length [delta]T2 of the material taking time through the desulfurizer storage amount of the desulfurizing agent bin, that is, starting material taking at the moment of T+[delta]T1 at the material taking point, stopping material taking at the moment of T+[delta]T1+[delta]T2, and meanwhile recovering normal conveying of the finished product trough; and for a raw material batching scale, recovering the belt weigher of the auxiliary raw material shale and iron ore to be started at the moment of T+[delta]T2, and recovering normal raw material grinding operation of a raw material grinding system. According to the method, the raw material grinding system is utilized, and high-purity CaCO3is extracted under the condition that a small amount of pieces of equipment is increased.

Description

technical field [0001] The invention belongs to the technical field of industry, and in particular relates to a method for improving the purity of a desulfurizing agent used for wet desulfurization of limestone gypsum. Background technique [0002] The limestone-gypsum wet desulfurization technology is used to desulfurize the flue gas at the cement industrial kiln tail, with high desulfurization efficiency and stable system operation. It is currently one of the most widely used flue gas desulfurization processes in the industry. This process generally uses the kiln dust collected by the dust collector at the end of the kiln as the desulfurization agent. Due to the large amount of impurities in the kiln dust, it has brought many adverse effects to the desulfurization system, such as causing the wall of the gypsum bin to stick and affecting the desulfurization product - gypsum. Purity and moisture content, due to the high moisture content of gypsum, when added to the cement mi...

AI Technical Summary

Problems solved by technology

This process generally uses the kiln dust collected by the dust collector at the end of the kiln as the desulfurization agent. Due to the large amount of impurities in the kiln dust, it has brought many adverse effects to the desulfurization system, such as causing the wall of the gypsum bin to stick and affecting the desulfurization product - gypsum. Purity and moisture content, due to the high moisture content of gypsum, when added to the cement mill, it will also have an adverse effect on the operation of the dust collector at the end of the kiln

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