Influence of TiO2 on viscosity, phase composition and structure of chromium-containing high-titanium blast furnace slag

Yang, Ding; Zhou, Hanghang; Wang, Jian; Pang, Zhengde; Pei, Guishang; Yan, Zhiming; Mao, Hongxia; Qiu, Guibao; Lv, Xuewei

doi:10.1016/j.jmrt.2021.03.069

Cited by 36 publications

(6 citation statements)

References 16 publications

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“…The lower value of X 2 /X 3 means the more bridging oxygen in a tetrahedral structure, that is, the higher polymerization degree of slag 34 . According to Equation and combined with the calculation of the spectral peak areas in Figure 5(b‐e), the effect of the variation of SiO 2 addition on the mole ratio of Q 2 to Q 3 structural units was obtained, as shown in Figure 5f.…”

Section: Resultsmentioning

confidence: 95%

“…The lower value of X 2 /X 3 means the more bridging oxygen in a tetrahedral structure, that is, the higher polymerization degree of slag. 34 According to Equation 2 and combined with the calculation of the spectral peak areas in Figure 5(b-e), the effect of the variation of SiO 2 addition on the mole ratio of Q 2 to Q 3 structural units was obtained, as shown in Figure 5f. The results show that the molar ratio of Q 2 to Q 3 decreased from 1.98 (S100 sample) to 0.83 (S85 sample), meaning that the addition of SiO 2 results in a more stable glass network, further making melt crystallization more difficult.…”

Section: Structure Evolution Of Parent Glassesmentioning

confidence: 99%

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Preparation of micro‐crystal stones from molten titanium slag by “one‐step” cooling method

Ding

Zhang

Qiu

et al. 2023

Int J Applied Ceramic Tech

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Medium-titanium blast furnace slag (MTS) is a major solid waste in the smelting process of vanadium and titanium magnetite. The moderate TiO 2 content in MTS makes it unsuitable for titanium extraction and difficult to be used as cement mixing material in large quantities. In this study, the molten MTS was utilized to prepare micro-crystal stones by a "one-step" cooling method, and the TiO 2 in the slag was used as a nucleating agent. The effects of the cooling process and MTS utilization on the slag structure, crystallization characteristics, and physical properties of the micro-crystal stones were investigated. The results show that when the utilization of MTS is 100 wt%, the main crystalline phase of the microcrystal stones is akermanite, the compressive strength and micro-hardness are 142.5 MPa and 696.9 kgf⋅mm −2 . When the utilization of MTS is 90 wt%, the main phases of microcrystalline stone are augite and akermanite, and the compressive strength rises to 194.8 MPa. Hence, through proper cooling control, the preparation of micro-crystal stones with good performance by using molten MTS as raw material will have considerable economic value.

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Section: Resultsmentioning

confidence: 95%

Section: Structure Evolution Of Parent Glassesmentioning

confidence: 99%

Preparation of micro‐crystal stones from molten titanium slag by “one‐step” cooling method

Ding

Zhang

Qiu

et al. 2023

Int J Applied Ceramic Tech

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“…With further TiO 2 addition, the number of nanograins per unit area decreases, and the average size increases to approximately 60 nm. Relevant literature studies have shown that with the increase of TiO 2 content, increase in oxygen ions provided by TiO 2 , the increase of O 2− will disrupt the silicate network, promote the formation of non‐bridging oxygen, and cause a decrease of viscosity 24,25 . Therefore, as the TiO 2 content increases, the glass viscosity decreases and the diffusion ability of ions is enhanced, promoting spinel grains containing Cr nucleation.…”

Section: Resultsmentioning

confidence: 99%

“…Relevant literature studies have shown that with the increase of TiO 2 content, increase in oxygen ions provided by TiO 2 , the increase of O 2− will disrupt the silicate network, promote the formation of non-bridging oxygen, and cause a decrease of viscosity. 24,25 Therefore, as the TiO 2 content increases, the glass viscosity decreases and the diffusion ability of ions is enhanced, promoting spinel grains containing Cr nucleation. For a TiO 2 content of 3.4 wt.% (T3), the largest number of grains was observed.…”

Section: 2mentioning

confidence: 99%

Effect of TiO₂ on the occurrence and distribution of chromium in stainless‐steel slag glass ceramics

Tong

Wang

Cheng³

et al. 2023

Int J of Appl Glass Sci

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Stainless steel slag waste can be used to prepare value‐added glass ceramics, which can fix potentially toxic Cr from the slag within the crystalline phase. The occurrence and distribution of Cr during the preparation of glass ceramics has a great influence on the final Cr fixation effect. In this study, the effects of the TiO2 content on the occurrence and distribution of Cr during the nucleation and crystallization steps and on the final properties of the glass ceramics were systematically studied. In the nucleation stage, with increasing TiO2 content, the Cr distributed in the spinel containing chromium nuclei first increases and then decreases. In the crystallization stage, Diopside crystal phase nucleates and grows with spinel containing chromium nanocrystals as heterogeneous nuclei. X‐ray photoelectron spectroscopy analysis showed that the chromium distributed in the diopside crystals first increased and then slightly decreased as the TiO2 content increased. The optimal TiO2 content is 3.4 wt.%, which resulted in 97 wt.% of the total Cr being fixed in the diopside crystalline phase (with a very low Cr leaching concentration of 0.009 mg/L), and a high compressive strength of the final glass ceramic of 267.4 MPa, and a Vickers hardness of 1211.8 HV. The research results provide theoretical and technical support for strengthening Cr fixation to enable harmless and high‐value utilization of stainless steel slag for fabricating glass ceramics.

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“…Concentrating Ti by previously developed strategies, such as acid leaching [3], alkali molten salt calcining [4], carbonizationchlorination [5] and high-temperature enrichment [6], suffers from low efficiency and high cost. Currently, the mostly available route for Ti-BFS utilization is used as a whole for building materials considering its high content of CaO and SiO 2 , but excessive TiO 2 (>10%) in Ti-BFS would suppress the polymerization degree of building materials and result in a negative effect on its volume stability [7]. As such, most of the Ti-BFS is disposed directly without further treatment, which causes the waste of Ti-containing secondary resource and poses a risk to the environment; thus, developing facile and efficient approaches to recycle Ti-BFS has become a critical issue needing to be seriously considered.…”

Section: Introductionmentioning

confidence: 99%

Efficient Recycling Blast Furnace Slag by Constructing Ti-Embedded Layered Double Hydroxide as Visible-Light-Driven Photocatalyst

et al. 2022

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In this work, a strategy of heat treatment-precipitation has been developed to recycle Ti-containing metallurgical solid waste by forming Ti-embedded MgAl layered double hydroxide (TMA-LDH). This facile and simple route is featured by the dedicated utilization of the composition of slag with high overall recovery efficiency. Importantly, as-obtained product exhibits visible light response distinctly different from that of pristine MA-LDH ascribed to the Fe doping inherited from initial slag. Its mesoporous nanostructure also provides more microchannels for mass and carrier transfer. As such, excellent photocatalytic activity towards degradation of tetracycline hydrochloride is achieved, and 88% removal could be obtained in 60 min. Furthermore, 44% increase in efficiency than that of Ti-excluded LDH also indicates the synergistically promoting effect of Ti incorporation. Mechanism investigation suggests that Ti incorporation regulates the electronic structure of pristine LDH with more active sites, and favors the formation of radicals with improved oxidative ability for photocatalysis.

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Influence of TiO2 on viscosity, phase composition and structure of chromium-containing high-titanium blast furnace slag

Cited by 36 publications

References 16 publications

Preparation of micro‐crystal stones from molten titanium slag by “one‐step” cooling method

Preparation of micro‐crystal stones from molten titanium slag by “one‐step” cooling method

Effect of TiO₂ on the occurrence and distribution of chromium in stainless‐steel slag glass ceramics

Efficient Recycling Blast Furnace Slag by Constructing Ti-Embedded Layered Double Hydroxide as Visible-Light-Driven Photocatalyst

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Influence of TiO2 on viscosity, phase composition and structure of chromium-containing high-titanium blast furnace slag

Cited by 36 publications

References 16 publications

Preparation of micro‐crystal stones from molten titanium slag by “one‐step” cooling method

Preparation of micro‐crystal stones from molten titanium slag by “one‐step” cooling method

Effect of TiO2 on the occurrence and distribution of chromium in stainless‐steel slag glass ceramics

Efficient Recycling Blast Furnace Slag by Constructing Ti-Embedded Layered Double Hydroxide as Visible-Light-Driven Photocatalyst

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Effect of TiO₂ on the occurrence and distribution of chromium in stainless‐steel slag glass ceramics