Preparation method of denitrified fly ash externally doped with denitration by-product

Abstract

The invention a preparation method of denitrified fly ash externally doped with a denitration by-product. The preparation method comprises the following steps: step 1, crushing and grinding the denitration by-product by using a grinding mill, filling a sealing bag with the crushed and ground denitration by-product, and conducting sealing; step 2, putting fly ash and denitration by-product powder obtained in the step 1 into a stirrer together, and conducting uniform stirring to obtain mixed powder; 3, uniformly spreading the mixed powder obtained in the step 2 into a heating container, sealingthe heating container with a sealing cover, and carrying out heating in a constant-temperature box; and step 4, after the heating in the step 3 is completed, conducting cooling to room temperature ina constant-temperature box, repeating the steps 2 and 3 once or twice to obtain the denitrified fly ash, carrying out uniform stirring, performing sealing and storing a sealed produced in a shady, cool and dry place. The preparation method provided by the invention has no influence on components, morphology, compressive strength and the like of the prepared denitrified fly ash externally doped with the denitration by-product, so when the denitrified fly ash is used as a mineral admixture in cement concrete, the engineering problems of prolonged cement setting time and reduced concrete strengthcannot be caused, and the denitrified fly ash is suitable for wide application.

Description

technical field [0001] The invention belongs to the field of preparation of building materials, and in particular relates to a preparation method of denitration fly ash mixed with denitration by-products. Background technique [0002] At present, my country's thermal power plants have basically completed the denitrification transformation, and the application of denitrification fly ash in engineering is gradually increasing. In the prior art, when denitrification fly ash is used as a mineral admixture in cement concrete, it is found that the mixing process has abnormal ammonia smell, Practical engineering problems such as prolonged cement setting time, decreased concrete strength, and even phenomena such as the fly ash itself volatilizes ammonia odor or the pH value drops abnormally. [0003] Now coal-fired power plants adopt selective catalytic reduction denitrification process, the main reaction principle is, NO x By NH 3 reduced to N 2 and H 2 O, its main reaction equa...

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Problems solved by technology

[0002] At present, my country's thermal power plants have basically completed the denitrification transformation, and the application of denitrification fly ash in engineering is gradually increasing. In the prior art, when denitrification fly ash is used as a mineral admixture in cement concrete, it is found that the mixing process has abnormal ammonia smell, Practical engineering problems such as prolonged cement setting time, decreased concrete strength, and even phenomena such as ammonia odor from fly ash itself or abnormal drop in pH value

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