Utilization of high-volume phosphogypsum in artificial aggregate by compaction granulation: effects of muck on physical properties, strength and leaching stability

Abstract

Artificial aggregate is an effective method to recycle for waste phosphogypsum (PG) in large quantity. This article proposes PG-muck artificial aggregates (PMAs) that combine PG and muck using compaction granulation to achieve high-volume utilization of PG. Varied PG and muck contents are applied to prepare PMAs, and the density, water absorption, strength, leaching stability, microstructure, and porosity of PMAs are tested. It is found that addition of muck can improve the PMA properties significantly, especially the leaching stability. Muck showed excellent immobilization capacity on contaminates in PMAs. Effects of muck addition are discussed comprehensively, and an optimized recipe for preparing PMAs is recommended.

Keywords:

• Phosphogypsum
• muck
• artificial aggregate
• compaction granulation
• adsorption and solidification
• soluble phosphor-fluorine

Acknowledgments

The authors gratefully acknowledge the financial support from the Key Research and Development Program of Hubei Province (2020BAB065), the National Natural Science Foundation of China (Grant No.52108245), Hubei Three Gorges Laboratory (Grant No.SC211004 and SC211014), Key R&D Program of Hubei Three Gorges Laboratory, and Knowledge Innovation Program of Wuhan-Shuguang Project.

Disclosure statement

No potential conflict of interest was reported by the author.

Funding

This work was supported by the Key Research and Development Program of Hubei Province (2020BAB065), the National Natural Science Foundation of China (Grant No.52108245), Hubei Three Gorges Laboratory (Grant No.SC211004 and SC211014), Key R&D Program of Hubei Three Gorges Laboratory, and Knowledge Innovation Program of Wuhan-Shuguang Project.