Phosphogypsum Utilization in Sustainable Building Materials
Summary
Phosphogypsum, a calcium sulfate–rich by-product of phosphate fertiliser manufacture, is accumulated in vast stockpiles worldwide. Its valorisation in construction aligns with circular economy principles by converting an environmental liability into a resource. Recent advances demonstrate that pre-treatment methods—such as flotation purification, thermal activation and water washing—can mitigate impurities and reduce soluble contaminants, rendering phosphogypsum suitable for incorporation into hydraulic binders, self-levelling floor screeds, lightweight foamed concretes and road base materials. When blended with Portland cement, lime, fly ash or polymer additives, phosphogypsum can impart improved workability, high early compressive strength and enhanced thermal performance while lowering embodied energy and CO2 emissions. Practical implementations range from industrial mine backfill and road subgrades to high-performance plaster and underlayment systems. Standardisation of quality parameters, regulatory acceptance and life-cycle assessment are driving wider uptake. The global significance of this research lies in reducing landfill burdens, closing material loops and delivering cost-effective, low-carbon alternatives for sustainable infrastructure and building envelopes.
Research from Nature Portfolio
A study on flotation purification of phosphogypsum demonstrated that removing soluble phosphorus and other impurities increased purity from around 73% to over 94% and substantially improved crystal whiteness. Subsequent preparation of α-hemihydrate gypsum under optimised autoclave conditions and controlled addition of organic modifiers yielded crystals with favourable aspect ratios and superior mechanical strength. The purified feedstock produced high-strength gypsum with enhanced moulding characteristics, suggesting a viable route for directly transforming industrial waste into value-added construction gypsum.
Phosphogypsum Utilization in Sustainable Building Materials publication trend
The graph below shows the total number of articles in phosphogypsum utilization in sustainable building materials across all publications each year (not limited to Nature Index journals).
Technical terms
Phosphogypsum: A calcium sulfate dihydrate by-product generated during production of phosphoric acid or phosphate fertiliser.
α-Hemihydrate gypsum: The denser, needle-shaped form of calcium sulfate produced under pressure or heat, used in high-strength plasters and binders.
Flotation purification: A separation technique using air bubbles and reagents to remove fine impurities and soluble salts from mineral suspensions.
Self-levelling underlayment: A fluid cementitious or gypsum-based layer applied to floors to achieve a smooth, level surface before final flooring.
Foamed concrete: A lightweight cellular material produced by entraining air or gas into a cementitious or gypsum slurry to yield low-density blocks or panels.
Ettringite: A needle-like calcium aluminium sulfate hydrate that forms during cement hydration, contributing to volume stability and early strength.
References
- The study on the effect of flotation purification on the performance of α-hemihydrate gypsum prepared from phosphogypsum. Scientific Reports (2022).
- Status and development trends of phosphogypsum utilization in China. CIRCULAR ECONOMY (2024).
- Phosphogypsum circular economy considerations: A critical review from more than 65 storage sites worldwide. Journal of Cleaner Production (2023).
- Properties of Foamed Lightweight High-Performance Phosphogypsum-Based Ternary System Binder. Applied Sciences (2020).
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