Conversion of Metallurgical Waste: The Impact of Reduction Ferrum Extraction on the Phase Composition and Cementitious Materials Reactivity of Jinchuan Ferronickel Slag

Abstract

In order to avoid the waste of iron caused by the direct use of ferronickel slag (FNS) in building materials, the effects of reduction iron extraction on the physical and chemical properties, cementitious reactivity and hydration reaction characteristics of FNS and ferrum extraction tailing of nickel slag (FETNS) were studied. The experimental results show that the reduction ferrum extraction method changes the mineral phase composition of the waste slag, breaks the Si-O-Si bond, forms the tetrahedral structure of Si-O-NBO or Si-O-2NBO, and increases the content of active components such as Ca, Si, Mg, and Al. Compared with FNS, the 28 d compressive strength of pastes prepared by FETNS increases by 16.12%, 22.57%, 33.13%, 44.26%, and 57.65%, respectively. The degree of hydration reaction of the composite cementitious systems in the FETNS group is higher than that in the FNS group at different ages, and the content of hydration products such as C-S-H gel and ettringite (AFt) is also higher than that in the FNS group. More hydration products can improve the curing ability to Cr and Mn of the composite cementitious systems in the FETNS group, and reduce the leaching value of Cr and Mn.

RIGHTS & PERMISSIONS

Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature