掺杂锂渣的硅酸盐水泥熟料的烧成特性及水化性能研究

doi:10.19964/j.issn.1006-4990.2024-0421

Abstract

Abstract:

Lithium slag is an industrial solid waste generated during the smelting process of metallic lithium，of which comprehensive utilization has received significant practical significance.Based on this，the effect of lithium slag additive on the burnability of raw materials was investigated.XRD and SEM techniques were applied to characterize the phase composition and microstructure of different clinkers.Meanwhile the changes in compressive strength and pore structure characteristics of cement mortar samples were analyzed.Base on the above results，the improving mechanism of the Portland cement clinker quality were revealed.Experiments showed that when the amount of lithium slag added reached 5%，cement clinker exhibited the best hydration performance.After curing for 3，28 d，and 90 d，the compressive strengths of the adhesive sand samples were as high as 38.16 MPa，58.35 MPa，and 75.61 MPa，respectively.The content of oxides including K₂O，Na₂O，and TiO₂ in the raw material was increased in accompany with a reduction in liquid phase viscosity，after adding lithium slag.This result significantly promoted the dissolution of CaO，accelerates the burning of cement clinker，and contributed to C₃S and C₃A generation.In addition，Al³⁺distributed in lithium slag could enhance its hydration activity by replacing Si⁴⁺ in C₃S and C₂S.Therefore，increasing the addition of lithium slag significantly improved the density of mortar products，and resulted to a decrease in the less multi harmful holes and harmful ones，thus endowing the mortar sample with ideal compressive strength.The research provided the theory basis and technology support for the comprehensive utilization of lithium slag

Key words: lithium slag, burnability, cement clinker, microstructure and performance, hydration characteristics

CLC Number:

TQ131.11

SI Bin, XUE Miaomiao, ZHAO Yali. Study on burning characteristics and hydration properties of portland cement clinker doped with lithium slag[J]. Inorganic Chemicals Industry, 2025, 57(7): 120-126.

Figures/Tables 12

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References 16

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样品	w（SiO₂）	w（Al₂O₃）	w（CaO）	w（MgO）	w（Fe₂O₃）	w（K₂O）	w（Na₂O）	w（BaO）	w（TiO₂）	烧失量
锂渣	44.25	25.29	8.56	0.16	0.14	2.50	6.14	0.25	2.56	10.15
生料	12.56	4.22	37.56	2.67	2.57	0.10	0.15	0.10	0.02	40.05

锂渣掺入量/%	气孔率/%	气孔尺寸分布/%
锂渣掺入量/%	气孔率/%	< 20 nm	20~< 50 nm	50~<200 nm	200~1 000 nm	> 1 000 nm
未掺入	22.23	10.26	19.55	15.54	34.61	20.04
1	20.96	18.55	20.66	18.98	30.13	15.68
2	18.23	20.81	19.26	19.32	27.01	13.60
3	17.11	15.72	17.03	15.69	39.20	12.36
4	16.39	14.86	18.02	14.87	40.35	11.90
5	15.26	22.61	16.99	18.00	30.80	11.60

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on burning characteristics and hydration properties of portland cement clinker doped with lithium slag

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