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Related Experiment Video

Updated: Jul 7, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

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An alternative approach for reusing slags from a plasma vitrification process.

Yi-Ming Kuo¹, Ho-Jung Tseng, Juu-En Chang

¹Department of Safety Health and Environmental Engineering, Chung Hwa University of Medical Technology, Rende Shiang, Tainan County, Taiwan, ROC. yiming@mail.hwai.edu.tw

Journal of Hazardous Materials

|February 5, 2008

Summary

Recycling hazardous plasma slag into valuable composites is possible by mixing it with unsaturated polyester resin. This method enhances physical properties and ensures hazardous metals remain contained, offering an effective waste valorization strategy.

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Area of Science:

Materials Science
Environmental Engineering
Waste Management

Background:

Vitrification transforms hazardous materials into inert slags.
Economic valorization of recycled slag is crucial.
Plasma slag recycling presents environmental and economic challenges.

Purpose of the Study:

To propose an alternative method for recycling plasma slag.
To create dough-like molding composites using plasma slag and unsaturated polyester resin.
To evaluate the physical and chemical properties of the resulting composites.

Main Methods:

Composites were fabricated by mixing plasma slag with unsaturated polyester resin.
Physical properties (tensile strength, hardness, elongation) were measured.
Microstructure was analyzed using SEM and XRD.
Chemical stability was assessed via toxicity leaching and hot water tests.

Main Results:

Optimal slag loading (0.1-0.2 mass ratio) improved composite physical properties.
Higher slag content weakened the resin structure, reducing strength and hardness.
The resin decomposed in hot acidic/water environments, but slag remained intact.
Hazardous metals were not leached from the slag.

Conclusions:

The proposed molding method effectively recycles plasma slag into composites.
The composites exhibit improved physical properties at optimal slag loading.
The process immobilizes hazardous metals, preventing leaching and ensuring environmental safety.