Method for preparing autoclaved fly ash brick through hydration with PO saponification waste residue, garbage power plant slag and coal-fired power plant fly ash

Abstract

The invention discloses a method for preparing an autoclaved fly ash brick through hydration with PO saponification waste residue, garbage power plant slag and coal-fired power plant fly ash. The method is characterized in comprising the following steps: (1) 100g of concrete is prepared into a building block with a size of 70mm*50mm*20mm; (2) garbage power plant slag is crushed; slag particles with sizes of 2-3mm are selected as an aggregate of the concrete; (3) water is added for dissolving additive auxiliary materials including an activating agent Na2SiO3, early strength agents Na2SO4 and triethanolamine, and a dispersing agent sodium rosinate; the PO saponification waste residue is added; the garbage power plant slag, PO42.5 cement and coal-fired power plant fly ash are sequentially added; the mixture is well mixed, such that a slurry is prepared; (4) the slurry obtained in the step (3) is fetched and pressed into building blocks; (5) the building blocks obtained in the step (4) are allowed to stand for curing for 24h; (6) the building blocks obtained in the step (5) are steamed in an autoclave reactor, wherein the temperature is controlled at 230-250 DEG C and autoclave is carried out for 5-9h; the material is discharged after natural cooling; and (7) compression strength tests and flexural strength tests are carried out. According to the invention, the above three solid waste resources are used or preparing the autoclaved fly ash bricks, such that waste is turned valuable.

Description

technical field

[0001] The invention relates to the technical field of comprehensive recovery and utilization of solid waste resources, in particular to a method for preparing autoclaved fly ash bricks by hydrating PO saponification waste slag, waste power plant slag and coal-fired power plant fly ash. Background technique

[0002] PO saponification waste residue is a kind of waste discharged during the saponification process of propylene oxide (PO) produced by the chlorohydrin method. For every 1 t of propylene oxide produced, there are about 40 t of chlorine-containing saponification wastewater and 2 The waste residue of t is produced, and the output is relatively large, and there is no clear treatment method at present. PO saponification waste residue is gray-white gypsum, with very fine and uniform particles and light density, and has the characteristics of high alkalinity, high salt content and high COD. The main component of PO saponification waste residue is Ca(OH) ...