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Ehsan Salehi

Ehsan Salehi

Academic rank: Professor
ORCID: https://orcid.org/0000-0003-4409-1242
Education: PhD.
ScopusId: 25643697300
Faculty: Engineering
Address: Arak University
Phone: 086-32625020

Research

Title
An efficient method for recycling spent residue cat-cracking catalysts (SRC) to prepare broadly-applicable mullite-based wear-resistant ceramics
Type
JournalPaper
Keywords
Spent residue catalysts (SRC); Mullite; Sintering; Wear-resistant ceramics
Year
2020
Journal Applied Clay Science
DOI
Researchers Babak Eidi ، Ehsan Salehi ، Azadeh Mohammadi ، Hadiseh Aghazadeh ، Abbas Ramezani

Abstract

Spent residue catalysts (SRC) of fluid cat-cracking were used as raw materials for the preparation of wearresistant ceramics. The starting material was wet-milled and then dried to obtain semi-dried powders. The resultant powder was pressed into various shapes and sintered at various temperatures (1300 to 1450 °C). The bulk density and linear shrinkage of the samples increased as the temperatures rose, while the apparent porosity and water absorption behaved in a reverse manner. Based on the results, the specimens sintered at 1450 °C appeared to be the best alternatives for the preparation of the wear-resistant ceramics. The results also revealed that pre-calcination has no significant effect on the final properties of the ceramic products. The XRD results approved that mullite is the only crystallized phase in the specimens sintered at 1450 °C. Moreover, the absence of vanadium and nickel-based phases in the XRD pattern indicated that these elements had been stabilized in the glassy phase. SEM images displayed the presence of needle-like mullite grains, in agreement with the XRD results. Additionally, SEM images illustrated that the fractures, appeared after the wear test, were inter-granular and may have been resulted from the well-controlled sintering conditions. Generally, the results of this study suggest a cleaner method for converting the SRCs to wear-resistant mullite-based ceramics with a wide range of industrial applications.