The nature of green alkaline iron sulfide solutions and the preparation of sodium iron(III) sulfide, NaFeS2

1978 ◽  
Vol 56 (22) ◽  
pp. 2797-2802 ◽  
Author(s):  
Peter Taylor ◽  
David W. Shoesmith
Keyword(s):  
Alkali Metal ◽  
Kinetic Data ◽  
Iron Sulfide ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Metal Sulfides ◽  
X Ray ◽  
Green Liquor ◽  
Iron Salts

The intense emerald green solutions formed by the reaction of iron salts with alkali metal sulfides at pH 11–13 have been found to contain colloidal MFeS2, M = Li, Na, K. Solid KFeS2 and NaFeS2 have been recovered from these systems. X-ray powder diffraction studies confirmed the identity of KFeS2, and showed NaFeS2 to have a structure different from those of other MFeS2 compounds, and related to that of the mineral rasvumite, K3Fe9S14. Some aspects of the crystal structures and chemistry of different MFeS2 compounds are discussed. A mechanism for the formation of colloidal MFeS2 is proposed on the basis of kinetic data. It is likely that colloidal NaFeS2 is responsible for the colour of the "green liquor" of the pulp and paper industry.

Characterization of Ecotoxicological Effects of Green Liquor Dregs from the Pulp and Paper Industry

2019 ◽  
Vol 7 (17) ◽  
pp. 14707-14715 ◽  
Author(s):  
Beatriz S. Bandarra ◽  
Luciano A. Gomes ◽  
Joana L. Pereira ◽  
Fernando J. M. Gonçalves ◽  
Rui C. Martins ◽  
...  
Keyword(s):  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Green Liquor ◽  
Green Liquor Dregs ◽  
Ecotoxicological Effects

Co-cooking nonwoods with hardwoods

TAPPI Journal ◽  
2014 ◽  
Vol 13 (6) ◽  
pp. 19-24
Author(s):  
TROY RUNGE ◽  
CHUNHUI ZHANG
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Strength Properties ◽  
Agricultural Residues ◽  
Kraft Pulping ◽  
Pulp And Paper ◽  
Strength Increase ◽  
Xylan Content

Agricultural residues and energy crops are promising resources that can be utilized in the pulp and paper industry. This study examines the potential of co-cooking nonwood materials with hardwoods as means to incorporate nonwood material into a paper furnish. Specifically, miscanthus, switchgrass, and corn stover were substituted for poplar hardwood chips in the amounts of 10 wt %, 20 wt %, and 30 wt %, and the blends were subjected to kraft pulping experiments. The pulps were then bleached with an OD(EP)D sequence and then refined and formed into handsheets to characterize their physical properties. Surprisingly, all three co-cooked pulps showed improved strength properties (up to 35%). Sugar measurement of the pulps by high-performance liquid chromatography suggested that the strength increase correlated with enriched xylan content.

Application of VSEP for Pulp and Paper Industry.

1999 ◽  
Vol 53 (10) ◽  
pp. 1334-1338 ◽  
Author(s):  
Yoshiya Kuide ◽  
Kazuyoshi Yamamoto
Keyword(s):  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Pulp And Paper
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