PERFROMANCE OF MULTIPHASE COLUMN FLOTATION BUBBLE REGIME ON WASTE PAPER INK REMOVAL

• Main Author: Pramuaji, Ikhwan
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/42371
• Institution: Institut Teknologi Bandung

Research to remove ink from waste paper as raw material for white paper has been carried out. Deinking of used paper is done using a multiphase column flotator. The flotation column has a volume of 10 Liters with a diameter of 94 mm. Bubbles are produced from air which is passed by the stainless steel porous media / sparger with a diameter of 1.27 cm and a length of 2.54 cm and a hole size of 0.5 ?m. Doses of chemicals used are 2% NaOH, 2% Sodium Silicate, 0.8% H2O2 and 1% Oleic Acid (on the basis of a waste paper oven dry weight). Homogenisation and flotation processes are carried out at 40oC. The good flotation process performance is generally obtained at 1.5% slurry consistency conditions with an air flow rate of 2 L / min for 15 minutes. The best deinking process performance values include brightness increase, deinking efficiency, brightness selectivity and deinking selectivity obtained in these conditions with successive values of 4.65%, 5.88%, 54.03% and 4.10%, respectively. The best value of fiber loss, ash / filler loss and yield were obtained under the same conditions but for 5 minutes flotation process with values of 7.37%, 12.70% and 89.89%, respectively. The best reduction of the Effective Residual Ink Concentration (ERIC) was obtained at a slurry consistency condition of 0.8% and an air flow rate of 2 L / min for 15 minutes with values of 46.40 ppm.