盐湖镁渣的热处理工艺及其对磷酸镁水泥性能的影响

doi:10.11896/cldb.22040072

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Abstract Salt lake magnesium slag is the waste residue produced in the process of extracting lithium extraction from salt lake brine. Due to the continuous development of lithium extraction industry, a large number of magnesium residues were produced and accumulated. How to effectively utilize these magnesium slags will become the necessary condition for ecological protection and efficient production in salt lake area. Salt lake magnesium slag was used as raw material for heat treatment and physical property analysis in this study, the salt lake magnesium slag after heat treatment was reacted with KH₂PO₄ to prepare salt lake magnesium phosphate cement (SLMPC). The effects of heat treatment process of salt lake magnesium slag on the setting time, compressive strength, hydration products and micro morphology of SLMPC were studied. The results show that the heat treatment process has a significant impact on the physicochemical properties of salt lake magnesium slag raw materials and SLMPC. With the increase of heat treatment temperature and holding time, the main phase Mg(OH)₂ of salt lake magnesium slag is gradually transformed into MgO, and its grain size and bulk density increase, specific surface area and hydration reaction activity decrease. The setting time of SLMPC slurry is extended from a few minutes to 33 minutes. The compressive strength of each age increased first and then decrease. The main hydration product was MgKPO₄·6H₂O. The optimum heat treatment temperature range from 1 000 to 1 100 ℃ and the holding time was 3 to 6 hours.

Key words： salt lake magnesium slag heat treatment process salt lake magnesium phosphate cement physicochemical property

Published: 10 December 2023 Online: 2023-12-08

CLC number:

TU528.01

Fund:This work was financially supported by Special Project for the Basic Research on Application in Qinghai Province(2020-ZJ-746), and Western Young Scholars Program of Chinese Academy of Sciences(2022000018).

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	Articles by authors
	DONG Jinmei
	WEN Jing
	ZHENG Weixin
	JIA Lirui
	CHANG Chenggong
	XIAO Xueying

Cite this article:

DONG Jinmei,WEN Jing,ZHENG Weixin, et al. Heat Treatment Technology of Salt Lake Magnesium Slag and Its Influence on the Properties of Magnesium Phosphate Cement[J]. Materials Reports, 2023, 37(23): 22040072-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22040072 OR http://www.mater-rep.com/EN/Y2023/V37/I23/22040072

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