Secondary Processing of Metallurgical Production Waste to Obtain Refractory Materials

Asainova, D. A.; Merkulov, V. V.; Akhmetova, G. E.; Ulyeva, G. A.

doi:10.1134/s2075113321040031

Cited by 5 publications

(6 citation statements)

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“…However, the traditional reinforced fibers are expensive, which makes high cost of the cement concrete. The refractory fibers are solid wastes without reasonable treatment [ 22 , 23 ]. This kind of fiber is mainly composed of alumina and zirconia, which shows good high temperature resistance.…”

Section: Introductionmentioning

confidence: 99%

The Influence of CaO and MgO on the Mechanical Properties of Alkali-Activated Blast Furnace Slag Powder

et al. 2022

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CaO and MgO are both reported as effective activators for blast furnace slag. However, the synergistic effect of these two components on the mechanical properties of alkali-activated blast furnace slag remains unclear. In this study, the flexural and compressive strengths of alkali-activated blast furnace slag powder with MgO and CaO range from 0% to 30% by the mass ratio of alkali-activated blast furnace slag powder are investigated. Moreover, the dry shrinkage rate of alkali-activated blast furnace slag powder is measured. One percent refractory fibers by volume of binder materials are added in the alkali-activated blast furnace slag. Some refractory fibers are treated with water flushing, meanwhile, some refractory fibers are directly used without any treatment. Finally, the scanning electron microscope, the thermogravimetric analysis curves and the XRD diffraction spectrums are obtained to reflect the inner mechanism of the alkali-activated blast furnace slag powder’s mechanical properties. The water-binder ratios of the alkali-activated blast furnace slag powder are 0.35 and 0.42. The curing ages are 3 d, 7 d and 28 d. The measuring temperature for the specimens ranges from 20 °C to 800 °C. Results show that the flexural and compressive strengths increase with the increased curing age, the decreased water-binder ratio and the addition of refractory fibers. The water-treated refractory fibers can improve the mechanical strengths. The mechanical strengths increase in the form of a quadratic function with the mass ratio of MgO and CaO, when the curing age is 3 d, the increasing effect is the most obvious. A higher water-binder ratio leads to an increasing the drying shrinkage rate. The activated blast furnace slag powder with CaO shows a higher drying shrinkage rate. The mechanical strengths decrease with the increasing testing temperature.

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Section: Introductionmentioning

confidence: 99%

The Influence of CaO and MgO on the Mechanical Properties of Alkali-Activated Blast Furnace Slag Powder

et al. 2022

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“…the authors recommend an electroless plating method for producing CNtbased metal composites (for insulators such as ceramics) by optimizing the MWCNt concentration and phosphorus content. Maqbool et al [43] have studied the mechanical properties of Cu coated CNt reinforced aluminium matrix composite fabricated by an electroless plating process. the microhardness and tensile properties of the uncoated and Cucoated CNt/Al composites were compared with pure Al.…”

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“…the ESA process with graphite electrodes is also used to reduce the microhardness and increase the plasticity of the surfaces of nonferrous alloys, for example, the surface layer of beryllium bronze BrB2 [43,48]. In this case, the time of alloying with carbon is determined by the re quired depth and microhardness of the surface layer.…”

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confidence: 99%

“…In some cases, the ESA process with graphite electrodes is used as a preliminary treatment to prevent the seizure (sticking) of electrodes during subsequently processing and, thus, to increase the continuities of the coatings [43].…”

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“…this is due to the fact that overheat ing of the quenched alloy above the temperature T k already at 10-15 °C leads to the development of relaxation processes and a corresponding decrease in the degree of phase hardening. In the Febased alloys, the Mt is sensitive to plastic deformation of initial austenite [41][42][43]. during the plastic deformation of austenite, it can both activate and inhibit subsequent Mt [44][45][46][47].…”

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