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The fireside of the recovery boiler is where the combustion of the strong black liquor and the chemical recovery processes simultaneously take place. Strong black liquor enters the recovery boiler from the brown stock washers containing 65 to 85% dry solids. The recovery boiler uses strong black liquor as its main fuel and during normal operation functions with black liquor as the only fuel. The cooking chemicals flow out of the recovery boiler as molten salts or smelt and are turned into green liquor in the dissolving tank. This green liquor is sent to the recausticizing process for conversion to white liquor.