The Effect of Adding Burn Lime and Fresh Lime Variations to The Quality of Lime Mud

Recausticizing units in mill pulp have a major role in converting green liqour into white liquor and produces lime mud as a by-product. In the recuaticizing process there is the addition of calcium oxide. Two types of calcium oxide are used, i.e burn lime and fresh lime. These two types will affect the quality of the lime mud produced. The objective of this research is to identify the effect of variations of addition burn and fresh lime to lime mud quality.The target parameters of CaCO3 content >86%, total alkali <1% and Non-Process Elements (NPE) <2%. The range of combination addition burn lime and fresh is between 0% - 100%. The optimal composition of addition of calcium oxide in the manufacture of lime mud both from a technical and cost perspective is the second variation (75% burn lime and 25% fresh lime ). The second variation gives content of CaCO3 86.80%, total alkali 0.1141% and Non-Process Elements (NPE) are P₂O₅ 0.4260%, SiO₂ 2.4344%, MgO 0.2260%, Fe₂O₃ 0.1984% and Mn₂O₅ 0 ,0068%. These result are in accordance with the lime mud quality standard.