Conversion of pulp and paper mill waste solids to a papermaking filler product
OwnerJohn V. Maxhaminventor
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Abstract
A process for the production of a papermaking filler product from the fiber fines/clay fraction of a pulp, paper, paperboard, or deinking mill waste solids such process comprising the reaction of said solids with sufficient acid to lower and maintain a pH of less than 5.0. Such process yields improvement in the drainage characteristics of the material. Bleach can be added or the pH raised back to neutral to further improve the specific resistance and/or brightness of the material.
Claims11
A process for improving the drainage characteristics of the fiber fines/clay fraction of waste solids generated by a pulp, paper, paperboard or deinking mill such that it is more suitable as a filler for paper, paperboard, and other fibrous product manufacture. said process comprising the steps of:
- a. separating the fiber fines/clay fraction of the waste solids from the other solids;
- b. concentrating the fiber fines/clay fraction;
- and,
- c. reacting the fiber fines/clay concentrate with sufficient acid to maintain a Ph not more than 5.0 to improve the drainage characteristics of the fiber fines/clay fraction.
Dependencies are inferred from the claim text.