Black Liquor Soap


Black liquor soap, a by-product of digestion in a kraft mill, tends to display characteristics such as abrasiveness, air entrainment, and a wide range of viscosities, dependent upon the temperature of the product. Viscosity control is crucial in order to stabilize black liquor concentrations prior to entrance in the recovery boiler. Black liquor viscosity is affected by solids concentration above 60% which, in turns, impacts: Heat transfer in evaporation units, pumping capacity and spraying characteristics.

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