Calcination-free phosphogypsum brick and manufacturing method thereof

Abstract

The invention discloses a calcination-free phosphogypsum brick and a manufacturing method thereof, and belongs to the field of building materials. The formula comprises phosphogypsum, aggregate, cement and an alkaline activator. The preparation method comprises the following steps: proportionally mixing the raw materials, stirring, crushing, carrying out extrusion molding, and curing to finally obtain the finished product calcination-free phosphogypsum brick. The calcination-free phosphogypsum brick prepared by the method is high in compression strength and breaking strength and good in waterresistance, freezing resistance and durability. According to the invention, the main raw materials are a large amount of solid wastes such as phosphogypsum, aggregate and the like, and the wastes areactivated and reasonably doped into the phosphogypsum brick, so that complicated pretreatment processes such as washing, drying, calcining and the like of phosphogypsum are avoided, and greenhouse gassuch as CO2, NO2, SO2 and the like, wastewater and secondary solid wastes are not discharged. According to the method, the utilization rate of phosphogypsum is greatly increased, accumulation of phosphogypsum is reduced, the land pollution rate is reduced, and great contribution is made to environmental protection.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a non-calcined phosphogypsum brick and a manufacturing method thereof. Background technique [0002] Industrial by-product phosphogypsum is an industrial solid waste produced in the wet process of phosphoric acid production, and about 4-5 tons of phosphogypsum will be discharged for every ton of phosphoric acid produced. Due to the limitation of technical level, the actual utilization rate of phosphogypsum in my country is only about 10%, and a large amount of phosphogypsum has not been effectively treated. [0003] The biggest difference between phosphogypsum and natural gypsum is that phosphogypsum contains certain impurities, and these impurities have different degrees of impact on the limited utilization of phosphogypsum. Pure phosphogypsum is pure white, but is often dark gray due to impurities. The real density of phosphogypsum is 1.40~1.8g / cm 3 , bulk density...

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Problems solved by technology

[0004] The above shortcomings make it difficult to use phosphogypsum. The stockpiling of phosphogypsum not only takes up a lot of land and costs a lot of money, but also the soluble P in phosphogypsum 2 o 5 , fluorine and other impurities are leached with rainwater to produce acidic wastewater, causing soil, water system and air pollution, causing serious ecological hazards

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