Recycling and comprehensive utilization of ferronickel slag in concrete

Han, Fengbo; Li, Yuchen; Zhang, Zengqi

doi:10.1016/j.jclepro.2023.137633

Cited by 21 publications

(3 citation statements)

References 70 publications

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“…Ferronickel slag, ranked as the fourth most abundant industrial solid waste slag in China, following iron slag, steel slag and red mud [1], has gained significant attention in recent years due to its ecofriendly status, efficiency, and resource utilization. Numerous studies have focused on the utilization of ferronickel slag as a raw material for crafting building materials [2], glass ceramics [3] and refractory materials [4].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Silicon Carbide Powder from Amorphous Silica and Investigation of Synthesis Mechanism

Duan,

Lu,

Jiang

et al. 2024

Minerals

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An innovative process for preparing silicon carbide (SiC) from acid leaching residue of ferronickel slag through a carbon–thermal reduction process was proposed in this study. The results indicate that the acid leaching residue is an ideal silicon source for SiC preparation according to its high amorphous silica content of 84.20% and fine particle size of d50 = 29.16 μm. Compared with carbon black, activated carbon, and graphite, coke is the more appropriate carbon source for SiC preparation. A micron-size SiC powder with grade of 88.90% and an average particle size (d50) of 44.68 μm can be obtained under the following conditions: the mass ratio of coke to leaching residue as 1.2:1, in an air atmosphere, reducing at 1600 °C for 3 h, following by decarbonizing at 700 °C for 4 h. The XRD, SEM and FTIR analyses show that the prepared powder is 3C-SiC and belongs to the β-SiC crystal type. Based on thermodynamic analysis and micromorphology observation, it can be concluded that with amorphous silica as the silicon source, the carbon–thermal synthesis of SiC powder follows both the solid–solid reaction mechanism and the gas–solid mechanism. The SiC created through solid–solid reaction is primarily nucleated in situ on amorphous SiO2, with a size close to that of the original acid-leaching slag, while the SiC generated according to the gas–solid mechanism mainly nucleates heterogeneously on the surface of carbon particles, resulting in a smaller particle size and mostly adhering to the surface of solid–solid nucleated SiC particles. This study provides a feasible method for the effective utilization of amorphous silica, which is also significant for the efficient consumption of the vast acid leaching residue.

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Section: Introductionmentioning

confidence: 99%

Preparation of Silicon Carbide Powder from Amorphous Silica and Investigation of Synthesis Mechanism

Duan,

Lu,

Jiang

et al. 2024

Minerals

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“…Ferronickel slag (FNS) is a kind of industrial solid waste created during the production of nickel alloys and stainless steel [ 1 , 2 ]. Generally, 14 tons of FNS may be generated for producing one-ton ferronickel.…”

Section: Introductionmentioning

confidence: 99%

Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue

Duan,

Zhang,

et al. 2024

Molecules

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A novel process for the synthesis of hydrated silica derived from ferronickel slag (FNS)-leaching residue was proposed in this study. The products of the purification of hydrated silica with 99.68% grade and 95.11% recovery can be obtained through ammonium fluoride (NH4F) roasting, followed by the process of water leaching, ammonia precipitating, and acid cleaning under the optimized conditions. The effects of NH4F mass ratio, roasting temperature, and roasting time on the water-leaching efficiency were investigated in detail. The thermodynamic and X-ray diffraction analyses indicated that the amorphous silica in FNS-leaching residue was converted to water-soluble fluoride salts ((NH4)2SiF6) during the roasting process, which are also supported by the scanning electron microscopy and thermogravimetry analyses. The Si–O bonds in amorphous silica could be effectively broken through the ammonium fluoride activation during a low-temperature roasting process. This work provides a meaningful reference for further studies on the facile synthesis of hydrated silica with similar mineral compositions.

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“…On the other hand, the Indonesian government classified slag as hazardous waste by following Basel's Convention regulation [9], so it is a potential challenge for taking advantage of ferronickel slag as a useful waste material. In the construction materials area, this problem may be resolved by directly utilizing the granular ferronickel slag as both fine and coarse aggregates [10][11][12][13] or transferring granular ferronickel slag into ground ferronickel slag (GFS) powder. GFS powder, as one of the industrial waste by-products, showed pozzolanic properties with chemical compositions of GFS mainly including quicklime (CaO), magnesia (MgO), alumina (Al2O3), silica (SiO2), and iron (III) oxide (Fe2O3) [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Abrams’ Law Formulation for Blended Cement Paste Incorporated with Ground Ferronickel Slag

Djayaprabha,

Fatharani

2024

U Karst

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Ground ferronickel slag (GFS) is a form of an industrial waste by-product generated during the smelting process of nickel ore that has been crushed and ground into fine powder. GFS is a pozzolanic substance that may be employed as an environmentally beneficial binding agent when blended with Portland cement. This research aims to apply the Abrams Law formulation to blended cement combined with GFS. GFS was utilized as a Portland cement composite (PCC) replacement at varying percentages of 0, 10, 20, 30, 40, and 50 wt.%. The blended cement paste incorporated with GFS was tested at three water to cementitious material ratio (w/cm) levels of 0.4, 0.5, and 0.6. After samples have been made, a compressive strength test is carried out. The research results showed that at 28 days, the optimum amount of GFS was found in the percentage of 20 wt.% induced the compressive strength by 40.41 MPa with a w/cm of 0.4. The equations based on Abrams’ Law have been proposed for estimating the correlation of 28-day compressive strength with w/cm in the range from 0.4 to 0.6. In addition, the hardened densities of binary blended cement paste were investigated. It was found that the density decreased with an increase of w/cm. The proposed equations provide the beneficial interpretation for estimating the compressive strength of blended cement paste based on the w/cm..

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Recycling and comprehensive utilization of ferronickel slag in concrete

Cited by 21 publications

References 70 publications

Preparation of Silicon Carbide Powder from Amorphous Silica and Investigation of Synthesis Mechanism

Preparation of Silicon Carbide Powder from Amorphous Silica and Investigation of Synthesis Mechanism

Activation Mechanism of Ammonium Fluoride in Facile Synthesis of Hydrated Silica Derived from Ferronickel Slag-Leaching Residue

Abrams’ Law Formulation for Blended Cement Paste Incorporated with Ground Ferronickel Slag

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