Preparation Method of Synthesizing Anhydrous Calcium Sulphoaluminate Expansion Agent Using Waste Slag from Aluminum Profile Factory

Abstract

The invention provides preparation method using aluminum profile factory slag to synthesize an anhydrous calcium sulphoaluminate expanding agent. The preparation method includes: weighing the aluminum profile factory slag, kaolin and limestone materials or limestone, and evenly mixing to obtain a raw material; grinding the raw material for 0.5-2 hours to obtain slurry, wherein the mass ratio of the raw material to spheres to water is 1:(1.4-1.6):(0.7-0.9); filtering and dewatering the slurry, drying, crushing, and sieving to obtain a powder material; mixing the powder material with binder, performing compression molding, and drying a formed base material; placing the dried base material into a kiln, calcining the dried base material under air atmosphere and the calcining temperature of 1310-1370 DEG C, performing heat preservation for 0.5-2 hours, and cooling to room temperature to obtain the anhydrous calcium sulphoaluminate expanding agent. The preparation method has the advantages that the aluminum profile factory slag can be utilized to the maximum extent under the premise that the high-purity anhydrous calcium sulphoaluminate can be obtained, the high-added-value recycling of the aluminum profile factory slag is achieved, and the production cost of the anhydrous calcium sulphoaluminate expanding agent is lowered evidently.

Description

[0001] 【Technical field】 [0002] The invention belongs to the field of cement concrete materials, and in particular relates to a preparation method for synthesizing anhydrous calcium sulfoaluminate expansion agent by using waste residue from an aluminum profile factory. [0003] 【Background technique】 [0004] During the pouring and hardening process of concrete, due to chemical shrinkage, cold shrinkage, dry shrinkage and other reasons, volume shrinkage will occur, and its shrinkage value is about 0.04% to 0.06% of its own volume. Leakage damage, steel corrosion caused by cracking, volume instability, etc. These shrinkage cracking damages the volume stability of concrete, thereby affecting its structural function, reducing the durability of concrete and shortening its service life. Shrinkage-compensated concrete, also known as expansive concrete, can be prepared by adding an expansive agent to the concrete. At present, due to its excellent anti-crack and anti-crack properti...

AI Technical Summary

Problems solved by technology

The amount of this kind of waste residue is very large. At present, the industrial waste residue discharged by most aluminum profile factories in my country is still simply piled up for disposal, which not only occupies a large amount of land, but also may pose a potential pollution threat to the environment. Therefore, how to safely and effectively dispose of it? This waste residue has attracted the attention of practitioners

Practitioners use aluminum profile factory waste slag as the main raw material for the production of aluminum hydroxide, aluminum chloride, activated alumina, mullite, cordierite, magnesium aluminum spinel, aluminum titanate and other materials, which has certain environmental benefits and economic benefits; however, when the above materials are prepared by high-temperature solid-state reaction method, the sulfate in the waste residue will be SO 2 released into the air, causing secondary pollution

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