Patent ID: 8703093

Claim:
Method for batchwise slaking of burnt lime in a slaker ( 2 ), in which a lime slurry is produced with a greater degree of fineness and prolonged sedimentation time, comprising the following process steps: emptying of finished slaked and diluted lime slurry from the slaker ( 2 ), 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 ( 2 ) 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 ( 7 ) to 0 kg before the next slaking, wherein regulation of the slaking temperature is carried out dependent on the temperature in the slaker, and adding and reduction of burnt lime is being repeated for each following batch until the temperature is within a predetermined range, in which at water temperatures under a predetermined lower limit of 95° C., the temperature is regulated in the next batch by increasing adding of burnt lime with a predetermined amount more lime until the slaking temperature is within a predetermined temperature range of 95° C.-99° C., and at water temperatures over a predetermined upper limit of 99° C., the temperature is regulated in that adding of burnt lime in the next batch is being reduced by a predetermined amount more lime until the slaking temperature is within the predetermined temperature range.