Method for batchwise slaking of burnt lime in a slaker, in which a lime slurry is produced with a greater degree of fineness and prolonged sedimentation time, comprising the following processing steps: - emptying of finished slaked and diluted lime slurry from the slaker, until there is a predetermined amount of slurry left, which is used for mixing with the next batch; - automatic coupling of a control system for automatic operation after the wanted slaking temperature has been reached in the first batch, which adds diluting water and thereafter burnt lime in a predetermined amount in the subsequent steps; - automatic regulation of the slaking temperature in the subsequent slurry batch, where the ratio between water and lime is adjusted if the wanted slaking temperature was not reached or passed in the previous batch and where the slaker is filled completely with water to stop the slaking if the maximum temperature is exceeded; and - automatic registering of the remaining slurry amount in the slaker after complete dosing of lime, and subsequent taring of a load cell installation to 0 kg before the next slaking, characterised in that the regulation of the slaking temperature is carried out in at least two phases, dependent on the temperature of the incoming water, in which - at water temperatures between 0-10 °C the temperature is regulated in that a predetermined amount more of the finished slurry is emptied out if a lower temperature limit is not reached, and if the temperature during the slaking exceeds an upper temperature limit a predetermined amount less of the finished slurry is emptied out, and - at water temperatures between 10-20 °C the temperature is regulated in that more of a predetermined amount of flushing water or diluting water is added if a lower temperature limit is not reached, and if the temperature exceeds an upper temperature limit during slaking less of a predetermined amount of flushing water or diluting water is added. - emptying of finished slaked and diluted lime slurry from the slaker, until there is a predetermined amount of slurry left, which is used for mixing with the next batch; - automatic coupling of a control system for automatic operation after the wanted slaking temperature has been reached in the first batch, which adds diluting water and thereafter burnt lime in a predetermined amount in the subsequent steps; - automatic regulation of the slaking temperature in the subsequent slurry batch, where the ratio between water and lime is adjusted if the wanted slaking temperature was not reached or passed in the previous batch and where the slaker is filled completely with water to stop the slaking if the maximum temperature is exceeded; and - automatic registering of the remaining slurry amount in the slaker after complete dosing of lime, and subsequent taring of a load cell installation to 0 kg before the next slaking, characterised in that the regulation of the slaking temperature is carried out in at least two phases, dependent on the temperature of the incoming water, in which - at water temperatures between 0-10 °C the temperature is regulated in that a predetermined amount more of the finished slurry is emptied out if a lower temperature limit is not reached, and if the temperature during the slaking exceeds an upper temperature limit a predetermined amount less of the finished slurry is emptied out, and - at water temperatures between 10-20 °C the temperature is regulated in that more of a predetermined amount of flushing water or diluting water is added if a lower temperature limit is not reached, and if the temperature exceeds an upper temperature limit during slaking less of a predetermined amount of flushing water or diluting water is added.