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1
Content available High Concentration of Arsenic Removal from Acid Leaching Solution of Zinc Oxide Dust by Water-Quenched Slag
Sun H. Y., Sen W., Kong X., Liu G. Y.
Archives of Metallurgy and Materials
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2018
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Vol. 63, iss. 1
425--430
EN
The present work provides a study on high concentration of arsenic removal from acid leaching solution of zinc oxide dust by water-quenched slag. The water-quenched slag is a waste slag produced from fuming furnace of lead pyrometallurgical process and used as a substitute of ferrous sulfate heptahydrate to precipitate arsenic at purification section. The effects of reaction temperature, reaction time, the addition of H2O2 and the addition of water-quenched slag on arsenic removal rate were systematically investigated. The reaction temperature of 70°C, reaction time of 1h, H2O2 addition of 10.8 mL/L and water-quenched slag addition of 17.8 g/L are identified as the best technical parameters. At the optimum conditions, the arsenic (III) with high concentration (As 4.13 g/L) is efficiently removed (arsenic removal rate > 99%). The filtrate (Fe 1.21 mg/L, As 1.53 mg/L) with low concentrations of arsenic and iron and the stable filter residue are also obtained successfully. The United States EPA Toxicity Characteristic Leaching Procedure (TCLP) test shows that the As leachability never exceeds the regulatory limit of 5 mg/L As. The results suggest that the water-quenched slag shows potential for removing high concentration of arsenic from acid leaching solution of zinc oxide dust.
2
Content available remote Effects of different Sn contents on formation of Ti2SnC by self-propagating high-temperature synthesis method in Ti-Sn-C and Ti-Sn-C-TiC systems
Sun H Y, Kong X, Sen W, Yi Z Z, Wang B S, Liu G Y
Materials Science Poland
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2014
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Vol. 32, No. 4
696--701
EN
Effect of different Sn contents on combustion synthesis of Ti2SnC was studied using elemental Ti, Sn, C and TiC powders as raw materials in the Ti–Sn–C and Ti–Sn–C–TiC system, in which the molar ratio of Ti/C was set as 2:1. The reaction mechanism for the formation of Ti2SnC was also investigated. The results showed that the amount of Ti2SnC in combustion products firstly increased with increasing of Sn content (0.6 to 0.8 mol), and then decreased with further increasing of Sn content (1.0 to 1.2 mol). Upon addition of 15 % TiC instead of Ti and C, the optimum addition of Sn decreased to 0.7 mol and a higher purity of Ti2SnC was obtained. The Ti2SnC powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD).
3
Content available Experimental Investigation on the Stab Resistance of Warp Knitted Fabrics
Miao X, Jiang G, Kong X, Zhao S
Fibres & Textiles in Eastern Europe
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2014
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Vol. 22, no. 5 (107)
65--70
EN
The stab resistance of two guide bar warp knitted fabric made from ultra-high molecular weight polyethylene was characterised by a maximum load, and energy at the maximum load and load versus displacement curves under quasi-static test conditions are presented. Penetration angles and side were designed. Samples with different lapping, densities and layers were tested, with a woven fabric used as the original reference. The results showed that warp knitted fabric with a moderate density and longer underlaps on the front guide bar performed better. The penetration angle and side have no observable influence on warp knitted fabrics’ stab resistance. Furthermore the performance of warp knitted fabrics during a knife penetration shows the difference from woven fabric in the damage process.
PL
W artykule stwierdzono, że odporność na przebicie specjalnych dzianin osnowowych wykonanych z włókien polietylenowych o ultra wysokim ciężarze cząsteczkowym można charakteryzować poprzez maksymalne obciążenie przy przebiciu, energię w chwili maksymalnego obciążenia i krzywymi obciążenia w funkcji przemieszczenia w warunkach testowych quasi statycznych. Między innymi określono kąty penetracji . Przygotowano próbki o różnej strukturze, masie liniowej i ilości warstw. Wyniki porównywano w stosunku do wyników uzyskanych dla tkaniny. Wyniki wskazują, że dzianiny osnowowe o średniej masie liniowej i dłuższych łącznikach oczek są bardziej odporne na przebicie. Natomiast nie stwierdzono wyraźnego wpływu kąta przebicia. Ogólnie stwierdzono wyraźną różnicę zachowania się dzianin w stosunku do tkanin przy penetracji nożem.
4
Content available remote Application of Hilbert-Huang Transformation for Identifying the Fault Location on Series Compensated Lines
Kong X., Zhang Z, Yin X., Deng X.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 5
135-140
EN
With the study on the transient state of series compensated lines under symmetrical and asymmetrical fault conditions, it’s obtained that low frequency component is much larger than aperiodic component of the measured transient current if the fault location is behind the series compensated capacitor. Due to the non-linear volt-ampere characteristics of MOV, the equivalent capacitive of series compensated device changes with time. Hence, the frequency of low frequency component caused by series compensated capacitor is time-varying. Hilbert-Huang Transformation is applied to analyze the instantaneous frequency and amplitude of the low frequency component to identify the fault location. The simulation results prove this method works.
PL
W artykule przedstawiono metodę lokalizacji awarii symetrycznych i niesymetrycznych w układach kompensacji szeregowej. Określono wpływ charakterystyki napięciowo-prądowej łącznika warystorowego na wartość harmonicznych niższego stopnia, wprowadzanych do sieci. Zastosowano transformację Hilbert-Huang w celu analizy chwilowej częstotliwości i amplitudy składowej niskiej częstotliwości oraz określenia miejsca awarii. Wykonano badania symulacyjne.
5
Content available remote Research and Implementation of CATIA Tool Integration Technology Based on CAA
Kong X., Qiu Y., Chang J.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 7b
300--302
EN
In order to implement the integration of the tool libraries from CATIA and the tool database, CATIA software was further developed using CAA. CAA macro-based integration project about the two libraries is proposed, and the development process is presented. In CAA environment provided by CATIA, though further developed using CAA, calling for information, converting information and valuating information of CATIA and TOOLMANAGER were researched. Finally, the dynamic calling, association and driving of CATIA-based tool information were implemented successfully.
PL
W artykule analizuje się możliwości oprogramowania CATIA służącego do projektowania typu CAD/CAE/CAM. W analizie wykorzystano architekturę typu CAA (component application architecture).
6
Content available remote Spectral Energy and Age Distributions for 51 Globular Cluster Candidates
Ma J., Zhou X., Chen J., Wu H., Kong X., Jiang Z., Zhu J., Xue S.
Acta Astronomica
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2002
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Vol. 52, No. 4
453--470
EN
This paper is the fourth in a series presenting spectrophotometry of 51 globular cluster candidates, that were detected by Mochejska et al. in the nearby galaxy M33 using the data collected by the DIRECT project. The frames of M33 in this study were taken as a part of the BATC Multicolor Sky Survey. We obtained the spectral energy distributions of these candidates in 13 intermediate-band filters. By comparing the integrated photometric measurements with theoretical stellar population synthesis models of Bruzual and Charlot, we estimated their ages. The BC96 models provide the evolution in time of the spectrophotometric properties of simple stellar populations for a wide range of stellar metallicity. Our results show that half of the candidates are younger than 108 years. We also find that globular clusters formed continuously in M33 from ≈4×106 to 1010 years. Our results are in agreement with Chandar et al. who estimated ages for 35 globular clusters candidates from our list by comparing the photometric measurements to integrated colors from theoretical models by Bertelli et al. The Kolmogorov-Smirnov test shows that the maximum value of the absolute difference of estimated ages between Chandar et al. and us is 0.48, and the significance level probability is 100.00%.
7
Synthesis, Characterization and Magnetic properties of tetracarboxylato-Bridged Binuclear Cobalt (II) Complexes
Li Y., Yan C., Kong X.
Polish Journal of Chemistry
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1999
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Vol. 73, nr 10
1665-1671
EN
It is proposed that these complexes have PTMA-bridged structures and consist of two cobalt(II) ions, each in a distorted octahedral environment. The complexes were further characterized by variable temperature magnetic susceptibility measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator. The result indicates that there is a very weak antiferromagnetic spinexchange interaction between the two Co(II) ions within each molecule.
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