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


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ALTINER M. , YILDIRIM M.

JOURNAL OF ADVANCED CONCRETE TECHNOLOGY, vol.15, no.6, pp.269-277, 2017 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 15 Issue: 6
  • Publication Date: 2017
  • Doi Number: 10.3151/jact.15.269
  • Title of Journal : JOURNAL OF ADVANCED CONCRETE TECHNOLOGY
  • Page Numbers: pp.269-277

Abstract

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/MgCl2 (M-x) and H2O/MgCl2 (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 M6.06H14 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 H3PO4 (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.