Hybrid Treatment of Black Liquor to Control Scaling in Paper Industry

JR Khan, Shah Muhammad, Rukhsan Yasmin, Waqas Karamat


Wood-based raw materials have always been favorable for pulp making purposes. Non-wood raw materials like wheat straw, bagasse, river grass, rice straw, etc. are although abundantly available but globally their use has been discouraged due to presence of silica. Wood is preferable due to absence of silica in it. Silica causes serious problems in the chemical recovery process as it causes scaling of heat transfer surfaces. This phenomenon reduces the plant production capacity and causes black liquor wastage, which is environmentally and economically undesirable. Black liquor is the byproduct obtained from cooking process at the pulp washing stage. The best way to treat black liquor is to process it through chemical recovery plant where it is first evaporated and then burned. In this research article, a number of experiments were carried out by using different conditions of temperature and residence time. Encouraging results were obtained and compared with other available techniques.

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