Refined by-products from the aluminium industrys spent pot lining (SPL) waste are a valuable source of fluoride, alkali, alumina and carbon for clinker manufacturing.Fluoride acts as a cost effective mineralizer resulting in an easier clinker burnability that reduces thermal energy consumption and/or promotes higher clinker alite levels.Alkalis allow an increase of the alkali level in clinker which can improve the alkali-sulfur balance and increase the content of soluble alkalis in cement.