529 Figure 8 – Integrated flowsheet: GlassLock 4.3 Environmental and Economic Considerations Both approaches produce a stable, non-hazardous glass, eliminating long-term arsenic liability. Pyrolysis is best suited for solid residues with high arsenic and valuable metals, while precipitation is ideal for large-volume, low-solid, arsenic-rich process streams. Both processes are compatible with existing mining infrastructure and can be integrated into closure or ongoing operations. 5. CONCLUSIONS Both pyrolysis and precipitation, when coupled with the GlassLock Process™, achieve >99% arsenic removal and produce environmentally compliant, stable glass products. Pyrolysis is optimal for solid, arsenic-rich concentrates, enabling further metal recovery. Precipitation is highly effective for treating large volumes of arsenic-laden process solutions. The GlassLock Process™ is scalable and provides a permanent solution to arsenic management in mining. REFERENCES DST-54182-LaboratoryTestProgram-REPORT-Feb2025_V1.pdf. DST-54162- Lab. & Eng. Program_FINAL REPORT_SEPT 2025_Rev1.pdf. Method 1311, Revision 0, July 1992, Final Update I to the Third Edition of the Test Methods for Evaluating Solid Waste, Physical/Chemical Methods, EPA publication SW-846. Additional references as cited in the original reports.
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