Our R&D Department has participated in the ''34th Annual Cement and Concrete Science Conference'' in Sheffield, UK, presenting experimental results about the use of magnesia cement in industrial waste cementation.
Magnesium oxide (MgO) reacts with solutions of various magnesium salts to form strong bonding phases, e.g. the reaction of MgO with MgCl2 and MgSO4 results in the formation of a mixture of magnesium oxychloride (MOC) and magnesium oxysulfate (MOS) phases accordingly, known as Sorel cement, widely used in industrial flooring, grinding stones and insulating panels applications. The effect of various physical and chemical properties of MgO on these cement systems is investigated herein.
Furthermore, an alternative use of this type of cements in waste cementation is studied. Stabilisation of industrial solid wastes converts hazardous substances to more stable chemical forms, which are much less soluble, mobile and toxic. Treatment of wastes, such as Electric Arc Furnace Dust (EAFD) using formulations based on MgO could significantly decrease the leaching of heavy metals in the environment, providing an economically viable solution. MgO acts as a buffering agent within the pH 9–10.5 range, minimizing heavy metals solubility and thus avoiding the redissolution that occurs in high pH values using lime or sodium hydroxide. Additionaly, the immobilisation of ions whose solubility/leaching behaviour is not pH dependant was studied. In accordance to the results, MgO formulations were found to be suitable for heavy metal stabilisation.
Go read more about the use of magnesia cement in industrial waste cementation to the following link: http://grecianmagnesite.com/content/use-magnesia-cement-industrial-waste...
This research has been co-financed by the European Union (European Social Fund - ESF) and Greek national funds through the Program "PAVET" – Project: Environmental applications of magnesia and utilization of produced by-products.