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Evaluation of demineralized lignin and lignin-phenolic resin blends to produce biocoke suitable for blast furnace operation

Castro-Díaz, Miguel; Vega, María Fernanda; Musa, Umaru; Díaz-Faes, Elvira; Barriocanal, Carmen; Snape, Colin

Authors

Miguel Castro-Díaz

María Fernanda Vega

Umaru Musa

Elvira Díaz-Faes

Carmen Barriocanal

Colin Snape

Abstract

Metallurgical coke makers could reduce carbon emissions and material costs by introducing waste lignin in coke oven charges. Two approaches have been studied here to increase the use of lignin in the preparation of metallurgical coke: lignin demineralization with H2SO4 and lignin blending with a low rank coal using phenolic resin as binder. The biocoke obtained after carbonization at 1000 °C from the hydrochar of demineralized lignin (350 °C, 6 h, biomass/water = 0.5 wt/wt) had much higher reactivity than the coke obtained from the low rank coking coal, proving that demineralization of lignin prior hydrothermal conversion is not a valid route for biocoke making. In the other approach, it was found that blends containing 70 wt% low rank coal, 24 wt% torrefied lignin (before or after demineralization) and 6 wt% phenolic resin produced biocokes with suitable mechanical strength for handling but higher reactivity than the coke obtained from the low rank coking coal alone. The microporous surface areas of the biocokes studied did not correlate with their reactivity values.

Journal Article Type Article
Publication Date Dec 15, 2019
Journal Fuel
Print ISSN 0016-2361
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 258
Article Number 116125
Institution Citation Castro-Díaz, M., Vega, M. F., Musa, U., Díaz-Faes, E., Barriocanal, C., & Snape, C. (2019). Evaluation of demineralized lignin and lignin-phenolic resin blends to produce biocoke suitable for blast furnace operation. Fuel, 258, https://doi.org/10.1016/j.fuel.2019.116125
DOI https://doi.org/10.1016/j.fuel.2019.116125
Keywords Kraft lignin, demineralization, torrefaction, phenolic resin, biocoke
Publisher URL https://www.sciencedirect.com/science/article/pii/S0016236119314796?via%3Dihub

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