Study of using dolomite as starting material resource to produce magnesium oxychloride cement

Abstract

In this paper, the starting materials necessary for producing magnesium oxychioride cement (MOC) 'ere produced from dolomite ore using leaching-carhonation-evaporation-pyrohvdrolvsis processes. The influences of the molar ratio of MgO/MgCI2 (Ms) and H2OIMgCI2 (I I,) on the properties of the MOC (cured for 7 days) were determined using physi co-mechanical methods. SliM and XRI) analyses were conducted to determine the change of phase and microstructure of the selected 7-day MOC depending on the production conduction. 'l'he experimental results show that the best mix proportion of 7-day MOC was found to he M0001114 and its thermal conductivit, tiexural 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 I 13P04 (4% of MgO by weight). Consequently, if MOC is produced from dolomite, high-purity synthetic aragonite and CO2 would be obtained as byproducts, which are strongly demanded.