Decolor method for fly ash

Abstract

This invention relates to a method for decoloring fly ashes. The method comprises: (1) soaking first grade fly ashes with 0.1-1% carbon content in water, and boiling; (2) heating carbon dioxide to 200 deg.C, and introducing into the boiling water soaked with fly ashes; (3) contacting fly ashes with carbon dioxide for 5-15 min for decoloration. The method uses carbon dioxide as the major raw materials, thus having such advantages as simple process, mild conditions, and improved fly ashes whiteness.

Description

technical field

[0001] The invention relates to a processing method for building materials, in particular to a method for decolorizing fly ash. Background technique

[0002] Fly ash is a kind of industrial ash with large accumulation and annual output. Its stacking seriously occupies cultivated land and pollutes the environment. At the same time, it has small fineness, uniform particle size and pozzolanic activity. From the above physical properties, it is a good filler for architectural coatings. However, its color is gray and its whiteness is very low, so it is not suitable as a filler for architectural coatings. Contents of the invention

[0003] The purpose of the present invention is to overcome the shortcoming that fly ash whiteness is low, improve through experiment, provide a kind of 2 As the main raw material, it is a method to decolorize fly ash and increase the whiteness of fly ash.

[0004] The purpose of the present invention is achieved through the follow...