A Sustainable Method for Chromium Recovery from Synthesized Stainless Steel Slags

Qiu, Feng; Wang, Wenshuai; Chen, Geng; Hu, Donghai; Wang, Rong; Liang, Jinshan; Li, Guoxuan; Zhong, Yi; Dong, Guangming; Li, Juncheng

doi:10.1007/s40831-023-00656-7

Cited by 4 publications

(1 citation statement)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over time, Cr 6+ and Ni 2+ can gradually leach out, infiltrating underground and polluting soil and water, which can severely damage the ecological environment [5]. Therefore, the comprehensive utilization of stainless steel slag has been a subject of concern [6,7]. China's harmless and resource-based treatment of stainless steel slag is still in the initial stage, mainly focusing on building materials, preparation of microcrystalline glass, ceramic materials, and other fields.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Calcination of Portland Cement Clinker Using Different Contents of Stainless Steel Slag

Ju,

Cao,

Guo

et al. 2024

Materials

View full text Add to dashboard Cite

In order to increase the utilization rate of stainless steel slag, reduce storage needs, and mitigate environmental impacts, this study replaces a portion of limestone with varying amounts of stainless steel slag in the calcination of Portland cement clinker. The study primarily examines the influence of stainless steel slag on the phase composition, microstructure, compressive strength, and free calcium oxide (ƒ-CaO) content of Portland cement clinker. The results show the following: (1) Using stainless steel slag to calcine Portland cement clinker can lower the calcination temperature, reducing industrial production costs and energy consumption. (2) With an increase in the amount of stainless steel slag, the dicalcium silicate (C2S) and tricalcium silicate (C3S) phases in Portland cement clinker initially increase and then decrease; the C3S crystals gradually transform into continuous hexagonal plate-shaped distributions, while the tricalcium aluminate (C3A) and tetracalcium aluminoferrite (C4AF) crystal structures become denser. When the stainless steel slag content is 15%, the dicalcium silicate and tricalcium silicate phases are at their peak; the C3S crystals are continuously distributed with a relatively dense structure, and C3A and C4AF crystals melt and sinter together, becoming distributed around C3S. (3) As stainless steel slag content increases, the compressive strength of Portland cement clinker at 3 days, 7 days, and 28 days increases and then decreases, while ƒ-CaO content decreases and then increases. When the stainless steel slag content is 15%, the compressive strength at 28 days is at its highest, 64.4 MPa, with the lowest ƒ-CaO content, 0.78%. The test results provide a basis for the utilization of stainless steel slag in the calcination of Portland cement clinker.

show abstract

Section: Introductionmentioning

confidence: 99%