Phosphogypsum lightweight concrete and preparation method thereof

Abstract

The invention relates to phosphogypsum lightweight concrete and a preparation method thereof. The preparation method comprises the following specific steps: weighing materials, mixing, adding water, adding an additive, stirring, diluting with a foaming agent, performing injection molding, and drying. The phosphogypsum lightweight concrete prepared by the preparation method is improved in strength and prolonged in service life.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of phosphogypsum, in particular to a phosphogypsum lightweight concrete and a preparation method thereof. Background technique [0002] Phosphogypsum is a solid waste discharged from the production of phosphoric acid or phosphate fertilizer. If phosphogypsum is arbitrarily discharged, it will not only pollute the environment, occupy land, but also invest a large amount of slag yard construction funds and operation and management costs. [0003] At present, the utilization status of phosphogypsum at home and abroad is that it can be used as cement retarder, stucco gypsum, gypsum board, hollow board, gypsum brick, block, underground filling, co-production of cement and sulfuric acid, road construction material, and ammonium sulfate. When phosphogypsum replaces natural gypsum to produce gypsum building materials, the acidity of phosphogypsum will lead to corrosion of building compo...

AI Technical Summary

Problems solved by technology

When phosphogypsum replaces natural gypsum to produce gypsum building materials, because phosphogypsum is acidic, it will cause corrosion of building components and production equipment

China has used phosphogypsum to make gypsum boards, blocks, and gypsum powder for construction, but there are still defects such as difficult purification and high energy consumption in the pretreatment and roasting of phosphogypsum, which affect the stability of product quality.

In addition to the above-mentioned problems, there are also the following problems: large cement fineness, fast hydration speed, low concrete water-gel ratio, high self-shrinkage of concrete, and the fact that the concrete is wrapped in steel pipes and is in a closed environment, which requires expansion agent hydration. It is difficult to get sufficient water supply, and the expansion effect of the expansion agent is difficult to effectively exert, so it is still difficult to solve the problem of "voiding" between the steel pipe wall and the concrete when the expansion agent is mixed.