Calcination-free phosphogypsum brick and manufacturing method thereof

A production method and calcination-free technology, which is applied in the field of building materials, can solve the problems that phosphogypsum is difficult to be used, occupies a large amount of land, and air pollution, etc., and achieves the effects of high flexural strength, increased utilization rate, and reduced pollution rate

CN111635209AInactive Publication Date: 2020-09-08JINGMEN YIXIANG CONSTR MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-09-08
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0025] The following specific examples further illustrate the present invention, so that those skilled in the art can better understand the present invention and implement it, but the given examples are not intended to limit the present invention.

[0026] The aggregate contains active SiO2 and Al2O3, which can react with Ca(OH)2 to produce C-S-H gel and calcium sulfate hydrate, and increase the relationship between the components in the PGS (phosphogypsum-based cementitious material) solidified body and the fine aggregate. The bonding of phosphogypsum bricks improves the compactness of phosphogypsum bricks; the alkaline activator increases the alkalinity of the PGS system, neutralizes the acid of phosphogypsum, promotes the hydration of the phosphogypsum system, shortens the setting time, and improves the compactness and strength of PGS and water resistance; under the stimulation of sulfate, activator and cement, the aggregate generates a large number of flocs, covering each c...