The pretreatment of non-ferrous metallurgical waste slag and its research progress in the preparation of glass-ceramics

Liu, Xiaomin; Li, Bin; Wu, Yongbo

doi:10.1016/j.jclepro.2023.136930

Cited by 14 publications

(1 citation statement)

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“…Fe element increases significantly, while the Ca element decreased, indicating that most Ca 2+ in diopside is replaced by Fe 3+ at this stage, and diopside changes to augite, making augite the main crystalline phase. Ti element in Figure 6D is the "nucleating agent" of high-temperature fired products Zhang et al, 2021;Liu et al, 2023). The presence of Ti element can effectively promote the nucleation of the fired product system, which is conducive to the preparation of high-strength fired products, which also verifies the formation of micron-sized grains in Figure 5D.…”

Section: Eds Analysismentioning

confidence: 85%

Firing mechanism and benefit evaluation of high-strength fired water permeable brick containing vanadium-titanium iron ore tailings

Bao

Jing

et al. 2023

Front. Earth Sci.

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Introduction: The vanadium-titanium iron ore tailings (VTIOTs) has a significant amount of discharge, and serious pollution, which makes it difficult to use directly as a resources resource.Methods: High-strength fired water permeable brick (HSFWPB) was prepared using VTIOTs as the main raw material. The orthogonal test, X-ray diffraction analysis (XRD), scanning electron microscope (SEM), energy dispersive spectrometry (EDS), and synthetic precipitation leaching procedure (SPLP) were obtained to study the basic properties and firing mechanism of HSFWPB containing VTIOTs, and an economic benefit evaluation was conducted on the project investment of HSFWPB containing VTIOTs.Results: The results show that when the content of VTIOTs in HSFWPB is 78%, the firing temperature (FT) is 1080°C and the holding time is 120 min, the compressive strength and permeability coefficient of the fired product reach 70.4 MPa and 0.055 cmˑs−1, respectively, which meet the requirements of Cc60 grade products in Water permeable brick (JC/T 945–2005). The products of HSFWPB containing VTIOTs after firing are diopside (CaMgSi2O6) and augite (Ca (Mg, Fe, Al) (Si, Al)2O6), with the increase of FT and the extension of HT, the low melting point elements of P, Na, K dissolve out, and the content of Fe and Al in the firing products increases, most of Ca2+ in diopside is replaced by Fe3+, so that augite becomes the main crystal phase. With the increase of FT, the pores in the fired products are changed from: closed pores with different sizes→ connected pores with irregular diameters→ irregular collapse pores→ small and uniform circular pores, which provides a guarantee for the permeability of HSFWPB containing VTIOTs.Discussion: The full investment payback period of the project of HSFWPB containing VTIOTs is 1.77 years. When the production reaches 48.585% of the design output, it reaches a breakeven point, and the project has strong risk resistance ability. The research has improved the utilization rate of VTIOTs and provided a new approach for the large-scale application of VTIOTs.

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Section: Eds Analysismentioning

confidence: 85%