The document describes the process for refining sugar from raw sugar syrup. The key steps are: 1) Affination where raw syrup is mixed with crystals to wash off molasses in centrifuges. 2) Carbonation where lime and carbon dioxide are added to precipitate impurities. 3) Filtration to remove impurities. 4) Decolorization by passing the liquor through bone charcoal filters. 5) Concentration and crystallization in vacuum pans to form pure sugar crystals.