Process for dephosphorization of molten metal during a refining process comprising the steps of - charging a vessel with hot metal and optionally scrap - charging said vessel with a first lime composition - blowing oxygen into said vessel - forming slag with said first lime composition charged into said vessel - dephosphorization of hot metal to form a refined metal reduced in phosphorus components, and - discharging said refined metal reduced in phosphorus components characterized in that said first lime composition comprises at least one first calcium-magnesium compound fitting the formula aCaCO 3.bMgCO 3.xCaO.yMgO.ul, wherein I represents impurities, a, b and u each being mass fractions ≥ 0 and ≤ 50%, x and y each being mass fractions ≥ 0 and ≤ 100%, with x + y ≥ 50% by weight, based on the total weight of said at least one calcium-magnesium compound, said at least one calcium-magnesium compound being in the form of particles, said first lime composition having a cumulative calcium and magnesium content in the form of oxides greater than or equal to 20% by weight based on the total weight of the first lime composition, and being in the form of compacts, each compact being formed with compacted and shaped particles of calcium-magnesium compounds, said compacts having a Shatter Test Index of less than 20%, preferably less than 15% and more preferably less than 10%, and in that said dephosphorization step of hot metal leads to a refined metal reduced in phosphorus components to the extent that the refined metal reduced in phosphorus is showing a phosphorus content lower than 0.02 w% based on the total weight of the refined metal reduced in phosphorus. - charging a vessel with hot metal and optionally scrap - charging said vessel with a first lime composition - blowing oxygen into said vessel - forming slag with said first lime composition charged into said vessel - dephosphorization of hot metal to form a refined metal reduced in phosphorus components, and - discharging said refined metal reduced in phosphorus components characterized in that said first lime composition comprises at least one first calcium-magnesium compound fitting the formula aCaCO 3.bMgCO 3.xCaO.yMgO.ul, wherein I represents impurities, a, b and u each being mass fractions ≥ 0 and ≤ 50%, x and y each being mass fractions ≥ 0 and ≤ 100%, with x + y ≥ 50% by weight, based on the total weight of said at least one calcium-magnesium compound, said at least one calcium-magnesium compound being in the form of particles, said first lime composition having a cumulative calcium and magnesium content in the form of oxides greater than or equal to 20% by weight based on the total weight of the first lime composition, and being in the form of compacts, each compact being formed with compacted and shaped particles of calcium-magnesium compounds, said compacts having a Shatter Test Index of less than 20%, preferably less than 15% and more preferably less than 10%, and in that said dephosphorization step of hot metal leads to a refined metal reduced in phosphorus components to the extent that the refined metal reduced in phosphorus is showing a phosphorus content lower than 0.02 w% based on the total weight of the refined metal reduced in phosphorus.