Castable systems designed with powders reclaimed from dismantled steel induction furnace refractory linings

Silva, Abílio P.; Segadães, Ana M.; Lopes, Rogério

doi:10.1016/j.ceramint.2017.01.012

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…In the European Union (EU), the production of spent refractories is estimated between 1.42 and 2.66 million tons per year. Although many efforts are being conducted, these debris are an economic and environmental concern as they lack effective ways of valorizing the huge volumes generated [14][15][16]. Of these wastes, 26% are doloma and magnesia recycled refractory materials (DMRR) from the steel industry [17].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

et al. 2021

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Nowadays, huge amounts of refractory materials are generated around the world. The majority of them lack valorization methods. This study analyzes the ability of a doloma and two magnesia spent refractory wastes as soil stabilizers on their own, as well as when combined with Ground-Granulated Blast Furnace Slags (GGBS). These materials showed a limited ability for the soil’s plasticity modification from a plasticity index of 15.6 to a minimum of 12.7. The high pH of the additives increased the soil’s pH from 7.88 to values in the range of 10.94–11.25 before the 28 days, allowing the development of the pozzolanic reactions. Unconfined compressive strength (UCS) increased along the curing time, reaching a maximum value of 5.68 MPa after 90 days. Based on the UCS, the optimum refractory GGBS ratios oscillate between 30:70 and 50:50. The UCS values after soaking samples reduced the unsoaked results between 68.70% to 94.41%. The binders considered showed a low effect against the soil swelling and the lack of delayed expansive effects because of the MgO hydration. Finally, X Ray Diffraction (XRD) tests showed that the stabilization only slightly modified the combinations of mineralogy and the formation of Magnesium Silicate Hydrate (MSH) gels.

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Section: Introductionmentioning

confidence: 99%

Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

et al. 2021

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“…It also focuses on these cyber threats in action and analyses how best to achieve successful cyber security in material/metallurgical manufacturing. Sintering systems, arc furnace and induction furnace systems are commonly used in metallurgical or material engineering and in factories [5], [6], [15]- [24], [7], [25]- [31], [8]- [14].…”

Section: Introductionmentioning

confidence: 99%

Malzeme Üretiminde Siber Güvenlik

Yener¹,

Yener²,

Mutlu³

2020

El-Cezeri Fen Ve Mühendislik Dergisi

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Industry 4.0, a new industry revolution, is happening now and several developed countries are leading the path. Internet of things (IoT) is also encompassed by Industry 4.0. In the future, more devices in factories are to be connected to Ethernet or Internet. However, this makes the companies, devices and researchers vulnerable to cyber-attacks. Recently, some cyber-attacks which have happened to some companies or countries verify the danger. Sintering systems and furnaces are used for research by universities and for series manufacturing by factories. Arc furnaces and induction furnaces are also commonly used devices in metal factories. A sintering system, an arc furnace or an induction furnace which is connected to Internet or Ethernet may also be under cyber-attack threat. The danger may be prevented by taking necessary precautions. In this study, these threeproduction systems are first briefly introduced and then inspected assuming that they have been connected to internet and examined with considering cyber-attack point of view. Some basic solutions against cyber-attacks to the aforementioned devices are suggested.

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“…For example, Al 2 O 3 has high strength and erosion resistance; the SiC and carbon have high thermal conductivity, low thermal expansion and nonwettability of molten liquid. Therefore, Al 2 O 3 –SiC–C composites are widely used in the iron–making process, particularly in iron runner . However, with the progress of smelting technology, the using conditions of Al 2 O 3 –SiC–C composites are becoming more and more demanding, such as the high efficiency, low cost, higher iron influx, long service life and so on.…”

Section: Introductionmentioning

confidence: 99%

Effects of in situ synthesis of CNTs/SiC_w on microstructure and properties of Al₂O₃–SiC–C composites

Gong

Chen

et al. 2019

Int J Applied Ceramic Tech

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Al 2 O 3 -SiC-C composites were prepared using tabular corundum, ball pitch and silicon carbide as the main raw materials. The carbon nanotubes (CNTs) and SiC whiskers (SiC w ) were in situ synthesized and their effects on the thermo-mechanical properties of Al 2 O 3 -SiC-C composites have been studied. The experimental results indicated that the high yield of SiC w and CNTs with large aspect ratio could be obtained due to addition of Ni(NO 3 ) 2 ·6H 2 O as catalyst in the composites. The cold modulus of rupture values were increased by 24% to 7.2 MPa, and the flexural modulus was increased from 19 GPa to 24 GPa. Additionally, the hot modulus of rupture reached a maximum value of 3.6 MPa, which presented a 71% increase over that of composites without catalyst. After three thermal shock cycles, the residual cold crush strength was improved from 57.1% to 76.9%. It is believed that the enhancement in the thermo-mechanical properties of Al 2 O 3 -SiC-C composites could be attributed to the reinforcement effect of SiC w and CNTs.

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Castable systems designed with powders reclaimed from dismantled steel induction furnace refractory linings

Cited by 5 publications

References 20 publications

Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

Malzeme Üretiminde Siber Güvenlik

Effects of in situ synthesis of CNTs/SiC_w on microstructure and properties of Al₂O₃–SiC–C composites

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Castable systems designed with powders reclaimed from dismantled steel induction furnace refractory linings

Cited by 5 publications

References 20 publications

Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

Stabilization of a Clay Soil Using Cementing Material from Spent Refractories and Ground-Granulated Blast Furnace Slag

Malzeme Üretiminde Siber Güvenlik

Effects of in situ synthesis of CNTs/SiCw on microstructure and properties of Al2O3–SiC–C composites

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Product

Resources

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Effects of in situ synthesis of CNTs/SiC_w on microstructure and properties of Al₂O₃–SiC–C composites