Case Study: Eliminate Costly Problems Of Poor Liquor Filtration

Poorly filtered green liquor can cause expensive operational problems downstream. A large Japanese paper manufacturer turned to METTLER TOLEDO for a reliable solution. Now, not only is poorly filtered liquor no longer an issue, operating costs have been significantly reduced too.

Green liquor clarification
During processes for recovery of chemicals from the pulping stage, so-called green liquor is produced which has to be clarified before it can be treated further. The purpose of clarification is to remove solids from the liquor. The solids, or dregs, are primarily unburned carbon particles from the recovery furnace. Along with carbon the dregs contain other impurities such as silica, iron, chromium, aluminum and magnesium. If these impurities are not removed from the green liquor in the clarifier they can cause many fouling, clogging and corrosion problems downstream. Therefore, efficient clarification is critical.