Abstract
Spent pot lining (SPL) is one of the largest solid wastes generated from the primary aluminium production process. Around 23 kg of SPL is generated per tonne of aluminum. ALBA is the largest aluminumproducing smelter in the world outside of China with an annual production of 1.56 million tonnes of aluminum (2021), the amount of SPL generated is becoming very significant. SPL is classified as hazardous material contaminated with cyanide and fluorides. The traditional way of handling such waste is either stockpiling around smelters facility or landfilling, which is not the best sustainable solution. ALBA has taken the initiative to construct its own one of a kind SPL treatment plant through its partnership with Regain Technologies to process and detoxify its SPL and convert it into useful feedstock for other industries such as the cement industry. This paper discusses the journey of Alba toward its sustainable solution of converting the SPL into a useful valuable product called HiCAL30. Moreover, this paper will focus on the process flow, detoxification heat treatment process as well as the final product specification and usages.KeywordsSpent pot lining (SPL)HiCAL30ClinkerCyanideFluoride
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