Aluminum Resource Recovery and High Value Aluminum Oxide Preparation from Secondary Aluminum Ash of Hazardous Solid Waste

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摘要

Secondary aluminum ash, a typical hazardous solid waste in China's aluminum industry, generates over 4 million tons annually while posing environmental risks and holding significant resource potential. Using secondary aluminum ash from a specific enterprise as raw material, this study employed an alkaline roasting-water leaching method to extract aluminum resources. The effects of key parameters—including alkali-to-material ratio, roasting temperature, roasting duration, leaching temperature, liquid-to-solid ratio, and leaching time—on aluminum extraction efficiency were systematically investigated. Subsequently, α-Al₂O₃ ceramic materials were prepared from the aluminum leaching solution. The optimal process conditions were identified as: alkali-to-material ratio 1.1, roasting temperature 800°C, roasting time 120 minutes, leaching temperature 70°C, liquid-to-solid ratio 14:1 mL/g, and leaching time 80 minutes, achieving an aluminum extraction rate of 91.83%. XRD analysis of the roasting residue confirmed successful conversion of metallic Al, AlN, and Al₂O₃ into soluble NaAlO₂. After purification and calcination at 1200°C, the aluminum leaching solution yielded α-Al₂O₃ ceramic materials with purity exceeding 99%. Through process optimization, this study demonstrates efficient extraction and high-value conversion of aluminum resources from secondary aluminum ash, providing a comprehensive technical solution for solid waste utilization in the aluminum industry.

文献引用

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