Modified phosphogypsum roadbed filler and preparation method thereof

Abstract

The invention discloses a modified phosphogypsum highway subgrade filler and a preparation method thereof. The method comprises the following steps: aging phosphogypsum for more than 5 days to obtain a material A; calcining the material A at 160-200 DEG C for 1.5-2.5 hours to obtain a material B, and naturally cooling the material B; uniformly mixing 91-93 wt% of the material A and 7-9 wt% of the material B to obtain a material C; and adding water, which accounts for 12-16 wt% of the material C, into the material C, and stirring uniformly to obtain the modified phosphogypsum highway subgrade filler. The phosphogypsum is calcined at controlled temperature for controlled time according to the chemical characteristics of the calcined phosphogypsum to obtain the modifier, thereby enhancing the gelation property in the phosphogypsum, improving the stability and water resistance of the internal structure and obtaining the subgrade filler satisfying the highway engineering requirements. The modified phosphogypsum highway subgrade filler effectively solves the problem that the existing phosphogypsum is restricted to the local doping materials and is low in consumption.

Description

technical field [0001] The invention belongs to the field of preparation of road subgrade materials, and more specifically relates to a modified phosphogypsum road subgrade filler and a preparation method thereof. Background technique [0002] The current application of industrial waste phosphogypsum mainly includes the following: preparation of gypsum as a building material, preparation of sulfuric acid co-production cement, production of low-alkali sulphoaluminate cement, use as an amendment for alkaline soil, and production Potassium sulfate and active calcium silicate, etc. [0003] The application of phosphogypsum in road construction is not only an effective way to solve environmental pollution problems, but also reduce road investment in areas lacking soil. There are many patents on phosphogypsum as a preparation material for roads, such as application publication number CN103771820A, application publication date 2014 The patent document on May 7 disclosed a fresh ph...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a modified phosphogypsum roadbed filler and a preparation method thereof, in which the phosphogypsum is calcined at a controlled temperature and time in combination with the characteristics of the phosphogypsum itself. Modifier, to modify and stabilize phosphogypsum to obtain modified phosphogypsum, so as to meet the requirements of roadbed filler in highway engineering, and correspondingly, it can effectively solve the limitation of existing phosphogypsum by local admixture materials and the consumption of phosphogypsum In addition, the present invention also researches and designs the calcining process parameters such as calcining temperature, calcining time, ratio of calcined phosphogypsum and aged phosphogypsum, water addition amount, etc., correspondingly high stability can be obtained , high water resistance and durability roadbed filler

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