Synthesis and applications of black ceramic from recycled industrial wastes

Yang, Yuguo; Xu, Jianhua; Cai, Bin; Wang, Q C; Xiu, Dapeng; Zhao, Zhe; Sun, Qinghong; Cao, Shuliang

doi:10.1179/1743676112y.0000000047

Cited by 24 publications

(8 citation statements)

References 20 publications

(28 reference statements)

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“…Moreover, VTBC collectors have been used in construction projects, such as residences, greenhouses, and educational buildings (Figure 3). Under these practical conditions, the efficiency values range from 24% to 57% [12,[19][20][21][22][23]. Among these, more than 80% of the testing results are within the range of 40%-50%.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling and Optimization of Vanadium-Titanium Black Ceramic Solar Collectors

Ding

Liu

2021

Energies

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The vanadium-titanium black ceramic (VTBC) coating on all-ceramic solar collectors has both high absorptance (0.94) and high emissivity (90%). However, the thermal conductivity of ceramic is very low (1.256 W/mK). To improve the heat collection efficiency of VTBC solar collectors, this paper establishes a mathematical model based on the energy-conservation relationships under steady-state conditions and creates a corresponding computer program. Key parameters for VTBC solar collectors include the heat-removal factor, effective transmittance-absorptance product for the absorber, total heat loss coefficient, etc. Then, via experimental testing, this study proposes a reference model for domestic VTBC solar collectors in a cold location (η = 0.89 − 2.20Tm*). Last, this work analyzes the influences of fin design and transparent cover design on VTBC solar collectors individually, using the created computer program. Results show that the most effective optimization method is to increase the transmittance of the transparent cover. By increasing the transmittance from 0.93 to 0.96, this study creates an optimized VTBC solar collector theoretical model (η = 0.92 − 2.20Tm*).

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Section: Introductionmentioning

confidence: 99%

Mathematical Modeling and Optimization of Vanadium-Titanium Black Ceramic Solar Collectors

Ding

Liu

2021

Energies

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“…Our intention is not to provide best fitting models to the observed IR SEDs; rather, we aim to show that a population of newly-produced supernovae grains, subject to the extreme prevailing conditions in young massive clusters, is able to explain the NIR-MIR excesses observed in such objects. We selected these four regions, because they all have reliable estimates of their stellar masses (Relaño et al 2010) and have experienced recent supernova activity as can be inferred from their relatively flat spectral indexes (Tabatabaei et al 2007;Yang et al 1996;Gordon et al 1993, see Table 1), which is interpreted as non-thermal (synchrotron) emission from supernova remnants.…”

Section: The Star Clusters In M33mentioning

confidence: 99%

Can Dust Injected by SNe Explain the NIR–MIR Excess in Young Massive Stellar Clusters?

Martínez-González

Wünsch

Palouš

2017

ApJ

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We present a physically-motivated model involving the different processes affecting supernova dust grains as they are incorporated into the thermalized medium within young massive star clusters. The model is used to explain the near-to mid-infrared (NIR-MIR) excess found in such clusters and usually modeled as a blackbody with temperature ∼ (400 − 1000) K. In our approach, dust grains are efficiently produced in the clumpy ejecta of core-collapse supernovae, fragmented into small pieces ( 0.05 µm) as they are incorporated into the hot and dense ISM, heated via frequent collisions with electrons and the absorption of energetic photons. Grains with small sizes can more easily acquire the high temperatures (∼ 1000 K) required to produce a NIR-MIR excess with respect to the emission of foreground PAHs and starlight. However, the extreme conditions inside young massive clusters make difficult for these small grains to have a persistent manifestation at NIR-MIR wavelengths as they are destroyed by efficient thermal sputtering. Nevertheless, the chances for a persistent manifestation are increased by taking into account that small grains become increasingly transparent to their impinging ions as their size decreases. For an individual SN event, we find that the NIR-MIR excess last longer if the time required to incorporate all the grains into the thermalized medium is also longer, and in some cases, comparable to the characteristic interval between supernova explosions. Our models, can successfully explain the near-infrared excesses found in the star clusters observed in M33 (Relaño et al. 2016) assuming a low heating efficiency and mass-loading. In this scenario, the presence of the NIR-MIR excess is an indication of efficient dust production in SNe and its subsequent destruction.

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“…To avoid further contamination by chromium-slag, the proper technologies should be applied to treat such chromium wastes before their simple deposit. Currently, most available technologies, such as detoxification treatment 2 7 8 9 10 11 and utilization 12 13 14 , are often energy consuming. Calcinations of chromium-slag with cinder had been used for the reduction of Cr(VI), but this technique requires special equipment and produces secondary pollution, such as waste gas 9 .…”

mentioning

confidence: 99%

“…However, the current bio-remediation techniques could hardly be widely used due to limitations such as the microbial species, microbial sensitivity to environment, and long remediation time 7 . Moreover, chromium-slag could be used for the preparation of cement, glass, brick, and concrete aggregate material 12 13 14 . However, current technologies are required to use the existing equipment and nearby resources to reduce cost.…”

mentioning

confidence: 99%

Remediation of chromium-slag leakage with electricity cogeneration via a urea-Cr(VI) cell

Zhang

et al. 2014

Sci Rep

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Chromium pollution has been historically widespread throughout the world. Most available remediation technologies often require energy consumption. This study is aimed to develop electrochemical remediation for Cr(VI) in chromium-slag leakage with self-generated electricity. Dynamic leaching experiments of chromium-slag samples were conducted to survey the release and leaching behavior of Cr(VI). Based on previous work, a unique urea-Cr(VI) was designed, in which urea was employed as the fuel and Cr(VI) from the leakage of the dichromate slag served as the oxidant. Furthermore, the electrochemical results showed that the removal percent of Cr(VI) was more than 96% after 18 h with the leakage Cr(VI) concentration of 2.69 mM. The open circuit potential (OCP) varied in the range of 1.56 ~ 1.59 V under different initial Cr(VI) leakage concentrations. The approach explores the feasibility of the promising technique without the need of energy input for simultaneous chromium-slag remediation and generation of electricity.

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Synthesis and applications of black ceramic from recycled industrial wastes

Cited by 24 publications

References 20 publications

Mathematical Modeling and Optimization of Vanadium-Titanium Black Ceramic Solar Collectors

Mathematical Modeling and Optimization of Vanadium-Titanium Black Ceramic Solar Collectors

Can Dust Injected by SNe Explain the NIR–MIR Excess in Young Massive Stellar Clusters?

Remediation of chromium-slag leakage with electricity cogeneration via a urea-Cr(VI) cell

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