Currently, more than 6 billion tons of phosphogypsum (PG) are accumulated worldwide, with an annual growth of ~280 million tons. More than 60% is stored in the mountains. Phosphorus pollution from PG due to rainwater leaching has caused serious water environment and ecological problems. Efficient phosphate recovery and resource utilization methods are essential to solving this problem.
Recently, a research group led by Prof. Chen Jingan from the Institute of Geochemistry of the Chinese Academy of Sciences (IGCAS) recovered phosphorus resources from PG effectively through zirconium membrane-triggered adsorption and struvite crystallization, and explained the detailed mechanisms of separation and purification. of phosphate to the atomic scale. The work was published in Journal of Chemical Engineering on June 29.
“Adsorption-complexation is the main mechanism of phosphate purification with the new zirconium membrane. These membrane materials can be recycled to effectively reduce the cost of the process,” said Prof. Chen.
The researchers found that more than 90% of the active phosphorus components of PG can be effectively recovered through the adsorption process caused by the new zirconium membrane, and at the same time realize the harmlessness of PG. The desorbed and concentrated phosphate radicals have been prepared into high-value agricultural fertilizers.
The findings of this study not only show a new method to realize the efficient use of PG resources, but also provide insights for pollution control and comprehensive use of PG in the regions of karst and even the world.
Xinping Hu et al, Phosphorus recovery and resource utilization from phosphogypsum leachate by membrane-triggered adsorption and struvite crystallization approach, Journal of Chemical Engineering (2023). DOI: 10.1016/j.cej.2023.144310
Awarded by the Chinese Academy of Sciences
Citation: Researchers propose new approach for harmless disposal of phosphogypsum (2023, July 13) retrieved on 13 July 2023 from https://phys.org/news/2023-07-approach-harmless- disposal-phosphogypsum.html
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