Abstract
This paper reports the characteristics of ferrochrome slag and its feasibility as aggregate in refractories aiming to substitute virgin refractory raw materials. Refractory castable specimens were formulated with ferrochrome slag as an aggregate and commercial calcium aluminate cement as a binder. Objective was to prepare refractory specimens with a maximum slag utilization but simultaneously to sustain good properties, comparable to those of virgin raw material refractory products. Mechanical and thermo-physical properties of the cured, dried and sintered specimens were characterized. Cold crushing strengths of best performing ferrochrome slag containing specimens were higher than 90 MPa and compressive strength values measured at 1200 °C were over 9 MPa. Thermal insulation properties were even better than those of commercial refractory reference, showing thermal conductivity values as low as λRT−1000 °C = 1.3 − 0.9 W/m K. The liquid phase formation above 1200 °C limits the ferrochrome slag use for refractory applications. Results suggest ferrochrome slag’s feasibility as an aggregate raw material for refractory materials up to temperatures of 1200 °C in air and up to temperatures of 700 °C in acidic gaseous atmosphere. Possible applications for this kind of novel refractory materials are, e.g., insulating secondary layers or bottom zones in metallurgical processes to substitute virgin refractories. A direct contact to molten metal must be avoided, but they are applicable as, e.g. floorings when exposed only to occasional melt droplets.Graphic
Highlights
1.6 Gt of steel was produced in 2014 creating 250 Mt of steel slag as residue [1]
This paper reports the characteristics of ferrochrome slag and its feasibility as aggregate in refractories aiming to substitute virgin raw materials
As this study aimed to determine the feasibility of ferrochrome slag to substitute the virgin raw materials in refractories, the effect of slag on refractory specimen properties was investigated and compared with conventional, commercial reference material targeted for similar applications
Summary
1.6 Gt of steel was produced in 2014 creating 250 Mt of steel slag as residue [1]. Kumar et al [13, 14] have reported FeCr slag use as aggregate in refractory castables replacing partly commercial aggregates use. They reported 50 wt% of slag use together with 35 wt% of calcined bauxite in [13] and 45 wt% of slag and 40 wt% of calcined bauxite use in [14]. To authors’ knowlewdge, there is a lack of information of ferrochrome slag utilizing refractory materials behaviour at elevated temperatures. For this reason, mechanical and thermal properties of ferrochrome slag based refractories were evaluates at high temperatures, resulting novel information about their high temperature behaviour
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
