Petrographic and thermal evaluation of dolomites for the manufacture of magnesium oxychloride cement

Kacker, K.; Mehrotra, G. S.; Rai, Mohan

doi:10.1002/jctb.5010200607

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…The presence of impurities in dolomite has been shown to severely affect its reaction and usability as a source of MgO, 335 and the avoidance of free CaO formation is imperative, as even as little as 2 wt % of this impurity is detrimental to the service life of MOC binders. 328 Other attempts to improve MOC binders include coformation of other oxychloride salts.…”

Section: Cost-effective Productionmentioning

confidence: 99%

Microanalysis of Primary Biological Particles from Model Grass over Its Life Cycle

China

Veghte

Ahkami

et al. 2020

ACS Earth Space Chem.

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This review examines the detailed chemical insights that have been generated through 150 years of work worldwide on magnesium-based inorganic cements, with a focus on both scientific and patent literature. Magnesium carbonate, phosphate, silicate-hydrate, and oxysalt (both chloride and sulfate) cements are all assessed. Many such cements are ideally suited to specialist applications in precast construction, road repair, and other fields including nuclear waste immobilization. The majority of MgO-based cements are more costly to produce than Portland cement because of the relatively high cost of reactive sources of MgO and do not have a sufficiently high internal pH to passivate mild steel reinforcing bars. This precludes MgO-based cements from providing a large-scale replacement for Portland cement in the production of steel-reinforced concretes for civil engineering applications, despite the potential for CO 2 emissions reductions offered by some such systems. Nonetheless, in uses that do not require steel reinforcement, and in locations where the MgO can be sourced at a competitive price, a detailed understanding of these systems enables their specification, design, and selection as advanced engineering materials with a strongly defined chemical basis. CONTENTS 1. Introduction 4170 1.1. Cements Based on MgO 4171 1.2. Magnesia Production 4171 2. Magnesium Carbonate and Reactive Magnesia Cements 4173 2.1. Reactive Magnesia 4173 2.2. Expansive MgO Cements 4173 2.3. Development of Reactive Magnesia Cements 4174 2.4. Carbonated Magnesia (MgO) Blocks 4176 2.5. Novacem 4177 2.6. Limitations of Carbon Sequestration 4177 2.7. Conclusions 4178 3. Magnesium Phosphate Cements 4178 3.1. Phosphate Bonding of MgO 4178 3.2. Application as Cements 4179 3.3. Method of Action 4179 3.4.

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Section: Cost-effective Productionmentioning

confidence: 99%

Microanalysis of Primary Biological Particles from Model Grass over Its Life Cycle

China

Veghte

Ahkami

et al. 2020

ACS Earth Space Chem.

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“…In the aforementioned studies, the raw materials used to produce MOC were acquired from industrial suppliers, whereas other researchers have used magnesite (MgCO 3 ) ore to produce one of the raw materials (MgO) used to prepare MOC (El-Mahllawy et al 2012;Tan et al 2015). The suitability of dolomite ore for producing MOC was evaluated by Kacker et al (1970).…”

Section: Introductionmentioning

confidence: 99%

Study of using Dolomite as Starting Material Resource to Produce Magnesium Oxychloride Cement

Altıner

Yıldırım

2017

ACT

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In this paper, the starting materials necessary for producing magnesium oxychloride cement (MOC) were produced from dolomite ore using leaching-carbonation-evaporation-pyrohydrolysis processes. The influences of the molar ratio of MgO/MgCl 2 (M x) and H 2 O/MgCl 2 (H y) on the properties of the MOC (cured for 7 days) were determined using physico-mechanical methods. SEM and XRD analyses were conducted to determine the change of phase and microstructure of the selected 7-day MOC depending on the production conduction. The experimental results show that the best mix proportion of 7-day MOC was found to be M 6.06 H 14 and its thermal conductivity, flexural strength, and compressive strength values were found to be 1.202 W/mK, 4.22 MPa, and 87.7 MPa, respectively. The water resistance of the MOC was improved by a small amount of H 3 PO 4 (4% of MgO by weight). Consequently, if MOC is produced from dolomite, high-purity synthetic aragonite and CO 2 would be obtained as byproducts, which are strongly demanded.

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“…The reactivity of MgO is largely affected by its particle size and size distribution, 15,16 surface defect and surface area, 17,18 as well as thermal history 19–21 . Measurements of the above properties of magnesia are time consuming, costly, and sometimes even impossible because of the lack of information and proper instruments at the sites of end applications.…”

Section: Introductionmentioning

confidence: 99%

Accelerated Reactivity Assessment of Light Burnt Magnesium Oxide

Chau

2008

Journal of the American Ceramic Society

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Light Burnt magnesium oxide (MgO), also known as magnesia, has a variety of industrial applications, including as the basic ingredient of magnesium oxychloride (MOC) cement. However, it is found that the quality, reactivity in particular, of Light Burnt MgO could vary so much that the workability and performance of magnesia-based final products can be significantly affected. Consequently, how to measure the reactivity of MgO would be the key for the further development and success of industrial applications of magnesia. To solve the problem, a simple, effective and yet economical test method for evaluating the reactivity of MgO is developed in this study, which utilizes the time required for neutralization to take place between MgO particles and an acidic solution. The experimental results show that the solubility of the major salts produced during the solidsolution reactions would fundamentally alter the reaction mechanism and thus the speed of the neutralization process. Moreover, the effects of MgO reactivity on the properties of MOC cement are assessed with a series of cement pastes using different MgO batches of various qualities. Finally, a classification of Light Burnt MgO with specific reactivity ranges for different applications is recommended for end users.

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Petrographic and thermal evaluation of dolomites for the manufacture of magnesium oxychloride cement

Cited by 7 publications

References 2 publications

Microanalysis of Primary Biological Particles from Model Grass over Its Life Cycle

Microanalysis of Primary Biological Particles from Model Grass over Its Life Cycle

Study of using Dolomite as Starting Material Resource to Produce Magnesium Oxychloride Cement

Accelerated Reactivity Assessment of Light Burnt Magnesium Oxide

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