Abstract: Compositions and method of improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the black liquor composition recovered from the digester in a chemical pulping process. The compositions and method are especially well suited for use in the Kraft pulping process.

Abstract: Compositions and method for improving inhibition of calcium salt scale formation under the conditions found in chemical pulp processes in which an effective amount of selected phosphonates or phosphonate blends is admixed with the aqueous digester composition in a chemical pulping process during the digestion stage. The compositions and method are especially well suited for use in the Kraft pulping process.

Abstract: A free standing screen-like space divider which is portable is provided particularly for use as a welding screen and which may consist of one or more sections with plural sections being pivotally interconnected, the divider frame including improved and versatile framing members. The framing members include corner frame members which are of tubular configuration having first and second tube portions positioned at right angles to one another and provided with outwardly projecting threaded nuts fixed to outer surfaces of the tube portions adjacent opposite ends thereof and surrounding openings in the tube portions, which openings are aligned with the threaded portions of the nuts to receive thumb screws therethrough into the interior of the tube portions to engage and releasably fix another tube-like member forming a part of the frame and being telescopically received within the tube portions.