Influences of different bischofite on the properties of magnesium oxychloride cement

Huang, Qing; Zheng, Weixin; Dong, Jinmei; Wen, Jing; Chang, Chenggong; Xiao, Xueying

doi:10.1016/j.jobe.2022.104923

Cited by 8 publications

(7 citation statements)

References 45 publications

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“…MOC production typically creates four primary reaction crystal phases, i.e., phase 2 (2Mg(OH) 2 •MgCl 2 •4H 2 O), phase 3 (3Mg(OH) 2 •MgCl 2 •8H 2 O), phase 5 (5Mg(OH) 2 •MgCl 2 •8H 2 O), and phase 9 (9Mg(OH) 2 •MgCl 2 •5H 2 O) [12]. The crystallization of such primary reaction phases is influenced by several significant factors, including the reactivity of MgO [13], MgO/MgCl 2 molar ratio, curing conditions [14], and chemical admixtures [10,15]. Phases 2 and 9 stabilize when the curing temperature exceeds 100 • C, whereas phases 3 and 5 remain stable at temperatures below 100 • C. Phases 3 and 5 are described as scroll-tubular whiskers that resemble well-crystallized needles.…”

Section: Introductionmentioning

confidence: 99%

Magnesium Oxychloride Cement: Development, Opportunities and Challenges

Ahmad,

Rawat,

Zhang

2024

Applied Sciences

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Magnesium oxychloride cement (MOC), an alternative to ordinary Portland cement (OPC), has attracted increasing research interest for its excellent mechanical properties and its green and sustainable attributes. The poor water resistance of MOC limited its usage mainly to indoor applications; nevertheless, recent advances in water-resistant MOC have expanded the material’s potential applications from indoor to outdoor. This review aims to showcase recent advances in MOC, including water-resistant MOC and ductile fiber-reinforced MOC (FRMOC), exploring their potential applications including in sustainable construction for future generations. The mechanism under different curing procedures such as normal and CO2 curing and the effect of different inorganic and organic additives on the water resistance of MOC composites are discussed. In particular, the review highlights the recent developments in achieving over 100% strength retention under water at 28 days as well as advancements in FRMOC, where tensile strength has surpassed 10 MPa with a remarkable strain capacity ranging from 4–8%. This paper also sheds light on the potential applications of MOC as a fire-resistant coating material, green-wood-MOC composite building material, and in reducing solid waste industrial byproduct accumulations. Finally, this study suggests future research directions to enhance the practical application of MOC.

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Section: Introductionmentioning

confidence: 99%

Magnesium Oxychloride Cement: Development, Opportunities and Challenges

Ahmad,

Rawat,

Zhang

2024

Applied Sciences

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“…Consequently, China, the global leader in the magnesium metallurgical market, must assume the environmental responsibilities associated with magnesium mining, manufacturing, and smelting. Especially, the exploitation of magnesite has been restricted due to carbon emission control and environmental protection measures . Therefore, there is a need for new ways to extract magnesium resources due to the introduction of strict environmental legislation and growing concerns about greenhouse gas emissions and climate change.…”

Section: Introductionmentioning

confidence: 99%

“…Within the salt lake industry, potassium chloride (KCl) extraction generates industrial byproducts in evaporation ponds, including bischofite. , Generally, bischofite (MgCl 2 ·6H 2 O) is a magnesium chloride mineral with crystallization water . However, the accumulation of large quantities of bischofite waste threatens the sustainable development and ecological environment of the salt lake industry. , Unfortunately, the utilization rate of bischofite remains low, with less than 1% of the total waste being effectively utilized . Statistical data from 2019 in China indicate that the production of potassium chloride was 804,000 tons, while solid waste bischofite exceeded an annual volume of 80 million tons .…”

Section: Introductionmentioning

confidence: 99%

“…Especially, the exploitation of magnesite has been restricted due to carbon emission control and environmental protection measures. 5 Therefore, there is a need for new ways to extract magnesium resources due to the introduction of strict environmental legislation and growing concerns about greenhouse gas emissions and climate change.…”

Section: Introductionmentioning

confidence: 99%

“… 8 However, the accumulation of large quantities of bischofite waste threatens the sustainable development and ecological environment of the salt lake industry. 5 , 9 Unfortunately, the utilization rate of bischofite remains low, with less than 1% of the total waste being effectively utilized. 4 Statistical data from 2019 in China indicate that the production of potassium chloride was 804,000 tons, while solid waste bischofite exceeded an annual volume of 80 million tons.…”

Section: Introductionmentioning

confidence: 99%

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Exergy Analysis and Modeling of Pilot-Scale Pyrolysis for Magnesium Oxide Preparation from Salt Lake Bischofite Industrial Waste

Xu,

Dong,

Zhao

et al. 2023

ACS Omega

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Currently, the traditional magnesium oxide production process is facing exceptional challenges arising from carbon emission restrictions and environmental protection. Waste bischofite pyrolysis has attracted much attention as a promising technology to address these challenges. Nonetheless, this process has primarily been demonstrated on a laboratory scale, with limited studies on an industrial scale. A comprehensive exergy analysis was conducted for the entire process and individual subunits within the pyrolysis process to identify potential areas for process enhancement. A FORTRAN subroutine based on empirical correlations of pyrolysis product yields was developed considering the impact of decomposition reactions on the simulation. Furthermore, the optimization of energy and exergy efficiency of the system was discussed in terms of the carbon dioxide emission factor, equivalence ratio, and pyrolysis temperature. The results show that the primary energy bottleneck lies in the combustion phase. In addition, the optimal energy and exergy efficiency conditions are a carbon dioxide emission factor of 5.3, an equivalent ratio of 1.15, and a pyrolysis temperature of 1100 °C. In comparison to the pilot-scale conditions, the energy efficiency and exergy efficiency increase by 2.55 and 3.61%, respectively. At this time, the MgO yield is 100%, and the HCl concentration is above 9.33%.

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Carbon sequestration behavior of magnesium oxychloride cement based on salt lakes magnesium residue and industrial solid waste

Li,

Zheng

et al. 2024

Carbon Capture Science & Technology

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Influences of different bischofite on the properties of magnesium oxychloride cement

Cited by 8 publications

References 45 publications

Magnesium Oxychloride Cement: Development, Opportunities and Challenges

Magnesium Oxychloride Cement: Development, Opportunities and Challenges

Exergy Analysis and Modeling of Pilot-Scale Pyrolysis for Magnesium Oxide Preparation from Salt Lake Bischofite Industrial Waste

Carbon sequestration behavior of magnesium oxychloride cement based on salt lakes magnesium residue and industrial solid waste

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