盐湖镁渣煅烧工艺对硫化镁水泥性能的影响

IF 1.4 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Cement Research Pub Date : 2022-02-16 DOI:10.1680/jadcr.21.00145

Xiuquan Liu, J. Wen, Chenggong Chang, Weixin Zheng, Qiyuan Liu, Xueying Xiao, Jin-mei Dong

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引用次数: 1

摘要

为了解决盐湖镁资源大规模利用的问题，以镁渣为原料，经洗涤煅烧制备了低成本的氧硫酸镁水泥。研究了煅烧温度对煅烧产物性能的影响，以及由煅烧产物制备的MOS水泥的相组成和微观结构。结果表明，当煅烧温度高于500°C，煅烧时间为2h时，MgO（OH）2已完全分解。随着煅烧温度达到500°C并继续升高，MgO的活性变高，晶粒尺寸变大。从微观结构和XRD可以看出，高温有利于所制备的MOS的针状相5Mg（OH）2·MgSO4·7H2O（相5）的生长。高煅烧温度导致高孔隙率。

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Effects of calcination process of Salt Lake magnesium slag on properties of magnesium oxysulfide cement

In order to solve the problem of large-scale utilization of magnesium resources in salt lake, low-cost magnesium oxysulfate (MOS) cement was prepared by using magnesia residue as raw material to produce light burning magnesia after washing and calcining. The effects of calcination temperature on the properties of calcined products and the phase and microstructure of MOS cement prepared from the calcined products were studied. The results showed that Mg(OH)2 had been completely decomposing when the calcination temperature was higher than 500°C and calcination time was 2 h. As the calcination temperature reaches 500°C and continues to rise, the activity of MgO gets higher and the crystal size gets larger. It can be seen from the microstructure and XRD that the high temperature is beneficial to the growth of needlestick phase 5Mg(OH)2·MgSO4·7H2O (Phase 5) of the prepared MOS. High calcination temperature results in high porosity.

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来源期刊

Advances in Cement Research 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

审稿时长

3.2 months

期刊介绍： Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.