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Green Liquor is produced in the Kraft process for making paper from pulp. Every Kraft pulp mill requires a chemical recovery system to be competitive. Spent pulping liquor i.e. non fiber components and cooking chemicals, are combusted in recovery boiler, which produces high pressure steam and "green liquor" a mix of mainly sodium sulfide and carbonate. It also contains suspended solids called commonly dregs. Inorganic impurities in the wood and some un-combusted carbon are the main components. Untreated green liquor has a dregs content of 1000 to 2000 ppm.

The combination of the Larox "C" Series Automatic Pressure Filter together with a Scheibler "A" Series Polishing Filter provides a superior solution for the removal of dregs from a Green Liquor Circuit that uses a clarifier compared to all alternative technologies.

The "C" Series Automatic Pressure Filter can be operated with or without cake washing as needed, but when cake washing is used it can reduce the residual Na₂O levels in the dregs cake to < 1.0% w/w basis. At the same time the Scheibler "A " Series Polishing filter can produce a clarified green liquor containing single-digit (<10) parts per million solids in the exiting stream.

Larox "C" Series advantages

• Does not require any pre-coat

• Eliminates raw material cost, dosing system etc.

• Reduced volume for disposal

• Drier filter cake

• Reduced transport costs

Scheibler "A" Series advantages

• No moving parts

• Cleaner filtrate

• Pre-coat or body feed not required

• Short cleaning / discharge cycle

• Very low energy usage - low pressure feed only