An active chemical solution containing sodium sulfide and sodium hydroxide, vital for the Kraft pulping process. It cooks wood chips under extreme heat and pressure inside a digester, dissolving the lignin to free the cellulose fibers. Once the cooking finishes, the solution becomes black liquor, which the mill recovers and burns to generate power.
Heard on the job
The digester needs a higher charge of white liquor to properly break down this batch of dense hardwood chips.
Also heard as
- cooking liquor