Selective removal of alkali salts from used refractory bricks using molten salt solvent
Innovative pretreatment method for removing alkali salts from refractory bricks using a molten salt solvent. This approach leverages high alkali solubility and rapid dissolution kinetics to enhance recycling efficiency while maintaining refractory integrity.
Overview
The proposed solution offers an advanced pretreatment method for removing alkali salts from used refractory bricks. By using a molten salt solvent system, such as NaCl-KCl-CaCl2, the method selectively dissolves alkali salts like NaCl and KCl from the refractory matrix without degrading the refractory oxides MgO and Al2O3. This innovative approach enhances recycling efficiency and sustainability in industries reliant on refractory materials.
Technical specifications
- Molten Salt System: Utilizes NaCl-KCl-CaCl2 to selectively target and dissolve alkali salts while preserving refractory material integrity.
- Operating Conditions: Effective at temperatures ranging from 350-550°C, optimizing dissolution and removal kinetics.
- Dissolution Kinetics: Rapid dissolution and homogenization enabled by low melting temperature and viscosity of the molten salts.
- Future Development: Includes designing low-cost molten salt solvents and optimizing process parameters like treatment time and temperature for industrial application.
Technology readiness level
This technology is at TRL 3, indicating that it has been validated in laboratory settings. Future validation plans include characterizing and optimizing the process to meet industrial standards for alkali salt removal efficiency.
About Penn State University
Penn State University is a comprehensive public land‑grant research university with a large multi‑campus footprint across Pennsylvania. Industry engages through a research and technology park adjacent to the flagship campus that houses corporate R&D, co‑located labs, and flexible collaboration space, as well as a statewide extension network that enables field testing, demonstration, and workforce reach. Integration with a major hospital system supports clinical translation, and an applied research laboratory fosters mission‑driven partnerships with government and industry sponsors. Research is supported by competitive federal funding from agencies such as NSF, NIH, DOE, USDA, DoD, and NASA. A dedicated technology transfer office manages IP, licensing, and startup formation to accelerate commercialization.
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