Environmental Compatibility of Lightweight Aggregates from Mine Tailings and Industrial Byproducts

摘要: A lightweight aggregate was produced by sintering the mixture of gold mine tailings, red mud, and limestone at 1150 °C. The physical (i.e., skid resistance, abrasion bond strength) environmental leachability) feasibility this assessed to consider its potential use as a construction material for bicycle lanes. resistance (British pendulum number 71) strength (1.5 N·mm−2) were found be appropriate use. However, loss value 290 mg, which exceeds limit Korean Standard KS F 281 (200 mg). Heavy metals not leach from in various leaching tests. These include (Korea Method Solid Waste), American (Toxic Characteristic Leaching Procedure (TCLP), Synthetic Precipitation (SPLP)), European (BS EN 12457-1) tests, despite raw materials containing significant amounts Pb, As, F. leachate extracted exhibited an aquatic toxicity Daphnia magna 13.94 TU24hr 14.25 TU48hr, most likely due high pH Ca concentration originating free CaO present aggregate. data suggests that properties reconstructed are lane construction, however dissolution level need controlled protect ecosystems.