Physicochemical property and chromium leaching behavior in different environments of glass ceramics prepared from AOD stainless steel slag

Herein, we prepare Cr-containing glass ceramics from argon-oxygen-decarburization stainless steel slag and characterize their physicochemical properties (e.g., Cr stability), revealing the occurrence of a diopside solid solution -> akermanite-gehlenite solid solution phase transition with increasing slag content. The properties of all ceramics (slag content = 40-80 wt%) met the requirements of the construction industry for building materials, with the highest flexural strength (137.83 MPa) as well as good acid and alkali resistance achieved at a slag content of 50 wt%. Moreover, the prepared ceramics were subjected to Cr leaching tests, which revealed that (i) Cr leached into aqueous solution was mainly present in the form of Cr3+ and largely precipitated as Cr(OH)(3) and (ii) the layered structure of akermanite-gehlenite glass ceramics can partially bind Cr and thus facilitate its effective immobilization. (C) 2019 Elsevier B.V. All rights reserved.