锂渣粉的组成及在水泥浆体中的物理与化学反应特性

doi:10.11896/cldb.19060173

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Abstract Composition of lithium slag (LS) powder and its physical and chemical reaction characteristics in cement paste were analyzed by means of XRF, ICP, XRD, TG/DTG, FTIR, SEM-EDS, nitrogen adsorption, etc. The SEM results showed that LS contained layered leached spodumene, rod-like gypsum, porous diatomite, spherical leached spodumene and disk-shaped calcium carbonate. Moreover, LS was a porous material, whose pores were mainly mesopores of 2—50 nm, caused by layered leached spodumene, carbon black, porous diatomite, etc. The speci-fic surface area from BET test and total pore volume in LS were 5 times and 4 times of P·II 52.5 cement respectively, but the average pore size was smaller than that of cement. Layered leached spodumene, gypsum as well as porous diatomite and carbon black were the main sources of high water content of LS. In addition, the large water demand of LS blended concrete was also related to the fact that gypsum, sodium sulfate, sodium carbonate and lithium carbonate can react with aluminate mineral in cement to form more ettringite, etc. LS is an acid slag which can reduce the alkalinity of cement paste mixed with LS. The main elements in LS affecting cement hydration are S, Ca, Si, Al, K, etc., while the influence of Li can be neglected. In addition to gypsum, the reason why LS has relatively high activity is also related to sodium sulfate, sodium carbonate and lithium carbonate in LS.

Key words： lithium slag composition cement paste morphology pore property

Published: 26 April 2020

CLC number:

TU528

Fund:This work was financially supported by China-Japan Joint Research Cooperative Program Sponsored by Ministry of Science and Technology in China (2016YFE0118200), the National Natural Science Foundation of China (51778132) and the National Basic Research Program (973 program) of China (2015CB655100).

Corresponding Authors: Yamei Zhang, received her Ph.D. degree in structu-ral engineering from Southeast University in 1998. She is currently a professor in Southeast University. Her research interests include the resource utilization tech-nology of solid waste, alkali activated cementitious materials, building energy-saving new materials, high-performance fiber reinforced cementitious composites, etc.

About author:: Baoliang Lireceived his M.S. degree in materials science and engineering from University of Jinan in 2011. From September 2015 till now, he has been pursuing his Ph.D. at School of Materials Science and Engineering, Southeast University under the supervision of Prof. Yamei Zhang. His research has focused on ferronickel slag based composite cementitious materials.

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	LI Baoliang
	YOU Nanqiao
	CAO Ruilin
	HUO Binbin
	CHEN Chun
	ZHANG Yamei

Cite this article:

LI Baoliang,YOU Nanqiao,CAO Ruilin, et al. Composition of Lithium Slag Powder and Its Physical and Chemical Reaction Characteristics in Cement Paste[J]. Materials Reports, 2020, 34(10): 10046-10051.

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http://www.mater-rep.com/EN/10.11896/cldb.19060173 OR http://www.mater-rep.com/EN/Y2020/V34/I10/10046

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