Structural and surface and acid-base properties of thermal power plant ash and slag
D.V. Mayorov, T.T. Gorbacheva
Section: Ecologization of industry
The ash slags formed at thermal power plants operating in the industrially developed northern region of the Russian Federation (Murmansk region) were investigated with the methods of BET (S. Brunauer, T. Emmett, and E. Teller) and BJH (Barrett-Joyner-Highland). It was found that the material has a predominantly mesoporous structure with a pore volume in the diameter range of 1.7–300 nm equal to 0.051 cm3/g and a specific surface area of 17.8 m2/g, which corresponds to the maximum levels observed at European thermal power plants of average power. It is established that the studied ash slag samples are characterized by a bimodal distribution of particles with a predominance of a fraction
of 40–64 micrometers. It is shown that by its physico-chemical and structural-surface properties, the ash-slag mixture belongs to type F according to the international classification ASTM C 618, according to which it can be recommended for direct use as a sorbent in the treatment of domestic wastewater, and the pH value of the iso-ion point (7.63) indicates a predominant sorption of cationic forms of biogenic elements on the studied sample.
Keywords: ash and slag mix, thermal power plant, structural and surface properties, acid-base properties, sorption
Article published in number 4 for 2022 DOI: 10.25750/1995-4301-2022-4-104-110