Synthesis of Calcium Magnesium Acetate (CMA) Deicer from Dolomite


Creative Commons License

Kurşunoğlu S. , Köken E. , Top S.

6 th International Conference on Materials Science and Nanotechnology For Next Generation (MSNG2019), Niğde, Türkiye, 16 - 18 Kasım 2019, ss.357-363

  • Basıldığı Şehir: Niğde
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.357-363

Özet

Calcium magnesium acetate (CMA) is an environmentally friendly alternative to sodium and/or calcium chloride for the use of de-icing salt on highways. Owing to the several advantages such as low corrosion for asphalt and concrete structures and multi-purpose availability, it is highly preferred for the use of road-salt. In this study, dolomitic rocks were investigated to synthesize the CMA in laboratory conditions. For this purpose, the initial size of rocks was manually reduced and the dolomitic materials with a particle size range of less than 0.5 mm were prepared for experimental studies. The prepared materials were utilized in leaching tests where dilute acetic acid (CH3COOH) solutions at a specific concentration of 40% were used for the dissolution of dolomite minerals. During leaching tests, the effects of leaching time (T, min), temperature (t, °C) as well as the ratio of solid to liquid (S/L) on the variations in dolomite dissolution were investigated. As a result of these investigations, it was determined that the average of dolomite dissolution rate were found to be 74.60% under the conditions of T = 180 min, t = 80 °C and S/L = 10%. The chemical constituents of the CMA as a final product was determined by crystallizing and evaporating of leach solutions at 80 ‒ 90 °C with a heating control procedure. X-Ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) analyses were used for the characterization of CMA products and the results showed that the CMA mainly comprises three main phases with different quantities: calcium magnesium acetate (59.7% ‒ 66.1%), calcium acetate (25.7% ‒ 31.5%) and magnesium acetate (8.2% ‒ 9.3%).