Preparation of Refined Calcium Carbonat from Reed KP White Mud

摘要

The refining methods of lime mud from chemical recovery of black liquid of reed pulp have been studied. The simple and convenient technologies of refining lime mud for CaCO_3 used as papermaking fillers have been discussed . The brightness of CaCO_3 refined by washing processes is 84～86%(ISO). Water consumption is about 30-50 ton for one ton's lime mud in the processes. The brightness of CaCO_3 refined by drying processes is 88～89%(ISO).The lowest water consumption is about 3～6 tons for one ton's lime mud. The optimum carbonizing temperature is about 50℃. The brightness of CaCO_3 refined by additive processes is 91.5%(ISO). Total water consumption in the processes is about 5～10 tons or one ton's lime mud. The experiments show that the refined CaC.O_3. can be used as papermaking filler. It is considered by summery of the relevant dates: equipment, process, cost of production ,water consumption, the brightness of product, that the technology using additive is optimum to refine lime mud for papermaking filler.