磷酸盐调控高活性氧化镁制备硫氧镁水泥

doi:10.11896/cldb.24120083

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Abstract The preparation of magnesium oxide (MgO) by calcining magnesite with new technologies such as flash roasting represents to be an energy saving upgrade for the conventional technologies. However, the product is not suitable for preparing magnesium oxysulfide cement (MOSC) due to its high activity and quick hydration rate. Phosphates were used as the modifiers in this work. The effect of phosphates on the hydration process of highly active MgO as well as the effect on setting time, fluidity and compressive strength of MOSC prepared by highly active MgO was investigated. The mechanisms on improving the performance of MOSC with modifiers were discussed. The results demonstrated that sodium dihydrogen phosphate (NaH₂PO₄) can effectively inhibit the hydration process of highly active MgO. When MOSC was prepared by MgO with an activity of 81%, the optimal performance was achieved by adding NaH₂PO₄ with a loading of 2%. The 7 d and 28 d compressive strength of MOSC were 43.8 MPa and 50.2 MPa, respectively, with the improvement up by 86.4% and 73.7% compared with the additive-free results. Adding NaH₂PO₄ can effectively delay the early exothermic hydration reaction, inhibit the formation of Mg(OH)₂, promote the growth of 5·1·7 phase, and therefore improve the compressive strength of MOSC.

Key words： highly active magnesium oxide magnesium oxysulfide cement phosphate hydration reaction compressive strength

Published: Online: 2026-02-13

CLC number:

TQ177.5

Corresponding Authors: jiasongyan@126.com;ltmlx@163.com

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	JI Renlin
	JIA Songyan
	TANG Jia’ao
	MA Yali
	ZHENG Qiang
	LI Xue

Cite this article:

JI Renlin,JIA Songyan,TANG Jia’ao, et al. Preparation of Magnesium Oxysulfide Cement by Highly Active Magnesium Oxide Regulated by Phosphate[J]. Materials Reports, 2026, 40(3): 24120083-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24120083 OR https://www.mater-rep.com/EN/Y2026/V40/I3/24120083

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