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Spherical phosphogypsum as well as preparation method and application thereof

A phosphogypsum, spherical technology, applied in the field of spherical phosphogypsum and its preparation, can solve the problems of paste grinding, high viscosity, poor fluidity and the like

Active Publication Date: 2021-07-06
HUBEI XINYANGFENG NEW BUILDING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phosphogypsum treated by this method is still in the form of powder, and has high water content, high viscosity, poor fluidity, and it is easy to cause problems such as silo blockage, agglomeration, and paste grinding in cement mills during use, which is difficult for industrial application.
In addition, the current phosphogypsum powder has a single function as a cement retarder, which is difficult to meet the requirements of high-performance cement

Method used

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  • Spherical phosphogypsum as well as preparation method and application thereof
  • Spherical phosphogypsum as well as preparation method and application thereof
  • Spherical phosphogypsum as well as preparation method and application thereof

Examples

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preparation example Construction

[0036] The present invention also provides a preparation method of spherical phosphogypsum described in the above scheme, comprising the following steps:

[0037] (1) After mixing phosphogypsum powder, cement and modifier, balling is carried out to obtain pellets;

[0038] (2) Solidify the spherical material to obtain spherical phosphogypsum.

[0039] In the invention, the phosphogypsum powder, cement and modifier are mixed and then formed into balls to obtain pellets. The present invention has no special requirements on the mixing method, as long as it can be mixed evenly; in the present invention, the ball forming is preferably carried out using a disc-type double-stirring granulator; the disc-rotating speed of the disc-type double-stirring granulator Preferably it is 14-16 revolutions / min, more preferably 15 revolutions / min; the particle size of the pellets is preferably 20-30 mm.

[0040] After the pellets are obtained, the present invention solidifies the pellets to obt...

Embodiment 1

[0049] In terms of parts by mass, take 97 parts of phosphogypsum powder, 3 parts of quick-hardening sulfoaluminate cement, and 0.1 part of alkali lignin as a modifier. When the diameter reaches 20-30mm, the material balls will drop into the PPS32.5R cement slurry (95% solid content) after being output from the ball forming plate, so that the material balls are evenly covered with a layer of cement slurry, and then passed through the mesh scraper. Take it out, transport it to a high-temperature and high-pressure reactor by a conveyor belt, and autoclave at 105°C for 20 minutes to obtain spherical phosphogypsum.

[0050] The resulting spherical phosphogypsum has a strength of 30N on day 1, a strength of 50N on day 3, and a strength of 90N on day 7, a moisture content of 15wt% on day 1, a moisture content of 11wt% on day 3, and a moisture content of 9wt% on day 7; soluble P 2 o 5 Content 0.6wt%, PH value is 8; SO 3 The content is 38.5wt%, the water of crystallization is 12wt%,...

Embodiment 2

[0052] Other conditions are the same as in Example 1, only the preparation raw materials are replaced by: 97 parts of phosphogypsum powder, 3 parts of P.O52.5 cement, 0.1 part of modifier alkaline lignin; the cement slurry is prepared with P.O52.5 cement, Solid content is identical with embodiment 1.

[0053] The resulting spherical phosphogypsum had a strength of 20N on 1 day, 45N on 3 days, and 85N on 7 days; a moisture content of 13.8wt% on 1 day, 10.5wt% on 3 days, and 8.8wt% on 7 days; Soluble P 2 o 5 The content is 0.6wt%, the pH value is 8.5; SO 3 The content is 38.7wt%, the crystal water is 12wt%, the water-soluble F content is 0.30wt%, and the ball forming rate is 91%.

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Abstract

The invention relates to the technical field of comprehensive utilization of solid wastes, and provides spherical phosphogypsum as well as a preparation method and application thereof. The spherical ardealite provided by the invention is prepared from the following raw materials: ardealite powder, cement and a modifier, wherein the modifier comprises alkaline lignin and / or ferrous sulfate. The spherical ardealite provided by the invention is high in physical strength, is not easy to break, and has a good retarding effect, when the modifier comprises lignin, the spherical ardealite can also improve the cement strength and reduce mixing water, and when the modifier comprises ferrous sulfate, the spherical ardealite can also reduce the content of water-soluble hexavalent chromium in cement. The spherical ardealite provided by the invention has a large amount of ardealite powder, is conducive to promoting the balance of production and elimination of ardealite, and fundamentally solves the ecological environmental protection problem caused by ardealite. Furthermore, the alkaline lignin is from the papermaking black liquid, the ferrous sulfate is from the titanium dioxide waste residues, and resource utilization of the papermaking black liquid and the titanium dioxide waste residues can be achieved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of solid waste, in particular to a spherical phosphogypsum and its preparation method and application. Background technique [0002] Phosphogypsum is a solid waste produced in the wet process phosphoric acid process, and its main component is calcium sulfate dihydrate. The emission of phosphogypsum is relatively large, and because the composition of phosphogypsum varies greatly in different regions and there are many impurities, it is difficult to comprehensively utilize it, resulting in a very low utilization rate of phosphogypsum. [0003] At present, from the perspective of utilization, the comprehensive utilization products of phosphogypsum are mainly traditional building materials, such as building gypsum boards and gypsum bricks. Phosphogypsum that cannot be utilized is generally accumulated in stockyards or discarded in sand pits. The long-term storage of phosphogypsum no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B22/14C04B103/22
CPCC04B40/0039C04B22/144C04B2103/22C04B22/143C04B24/28C04B22/08Y02W30/91
Inventor 孙小培
Owner HUBEI XINYANGFENG NEW BUILDING MATERIAL TECH CO LTD
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