White Liquor Handling

White liquor is a strong alkaline solution composed of sodium hydroxide (NaOH) and sodium sulfide (Na2S) in a mixture of hot water. It is used in the first stage of the Kraft process in which lignin and hemicellulose are separated from the cellulose fiber in wood chips for the production of pulp. The white liquor breaks the bonds between lignin and cellulose. It is called white liquor due to its white opaque color. 

White liquor also contains minor amounts of sodium carbonate, sodium sulfate, sodium chloride and other accumulated salts and non-process elements. During the cooking process white liquor becomes black liquor and is later sent to the recovery process for further processing into green liquor. 

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