Guangxi, China
Guangxi, China

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Guo Y.,East China University of Technology | Guo Y.,China Tin Group Co. | Yu W.,East China University of Technology | Chen J.,China Tin Group Co. | And 3 more authors.
Ultrasonics Sonochemistry | Year: 2017

To overcome the drawback of low stable brought by the transformation of Ag+ into Ag, a highly efficient and stable photocatalyst Ag3PO4/rectorite composite was successfully synthesized by ultrasound-assisted precipitation method. The as-prepared samples were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, N2 adsorption-desorption, room-temperature photoluminescence spectra, Fourier transform infrared spectrum measurements and UV–vis diffuse reflectance spectra. The absorption edges of the Ag3PO4/rectorite display a noticeable shift to the visible light region as compared to that of the Ag3PO4. Compared with bare Ag3PO4, the Ag3PO4/rectorite composite by ultrasound-assisted precipitation process exhibits significantly enhanced photocatalytic activity and stable for methyl orange (MO) degradation under visible light irradiation. The improved activity of the Ag3PO4/rectorite photocatalyst could be attributed to the expanded visible light absorption, the enhanced interfacial charge transfer and the inhibited recombination of electron-hole pairs. Therefore, the facile ultrasound-assisted preparation process provides some insight into the application of Ag3PO4/rectorite nanocomposites in photocatalytic degradation of organic pollutants. © 2016 Elsevier B.V.

Liu Y.,Wuhan University of Technology | Peng H.,Wuhan University of Technology | Hu M.,China Tin Group Co.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2013

A new permanent magnetic separator was introduced to treat the ores with the characteristics of weak magnetic iron minerals and in a fine size range. The new machine was applied to the iron removal from potash feldspar. The effects of the magnetic field intensity,pulp density and grinding fineness on the iron removal were investigated. The optimized operation parameters were achieved and listed as follows: the -0.074 mm content is 85%, the pulp density is 45% and the magnetic field strength is 2T. A close test of middles regrinding was also carried out to improve concentrate yield. The data show that the grade of TFe(total iron) in potash feldspar product decreased from 1.31% to 0.21% and the concentrate yield reached 85.32%. All the results indicated that the traditonal high-intensity electromagnetic separators can be betterly substituted by the new permanent magnetic separator. This study may provide the theoretical evidence for iron removal from potash feldspar. © Wuhan University of Technology and SpringerVerlag Berlin Heidelberg 2013.

Zhao C.-H.,Guangxi University | Zhao C.-H.,China Tin Group Co. | Wu B.-Z.,China Tin Group Co. | Chen J.-H.,Guangxi University | And 2 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2013

The electronic structure and properties of FeS2 with the space groups of Pa3 and P1 were studied by the density functional theory. The generalized-gradient approximation exchange-correlation functional was used in conjunction with a plane wave-ultrasoft pseudopotential representation. Calculation results show that differences are observed in electronic structures and properties between Pa3 and P1 crystals. The band gap and energy loss of P1 are smaller than those of Pa3 crystal, while the dielectric constant, conductivity, refractive index, extinction coefficient, and intensity of optical absorption of P1 are larger than those of Pa3. These behaviors are attributed to the differences in symmetry, atomic arrangement, and Mulliken bond population of each unit for Pa3 and P1 crystals. © 2013 University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

Huang G.-Z.,University of Science and Technology Beijing | Li D.-K.,University of Science and Technology Beijing | Luo X.-W.,China Tin Group Co. | Yang W.-Z.,China Tin Group Co. | And 3 more authors.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2013

The influence of polyacrylamide (PAM) conditioning combined with Al2(SO4)3 coagulant on Tongkeng mine slurry dewatering behavior was investigated by capillary water absorption time (CST) measurements. The dependence of the slurry dewatering behavior on interval time of adding chemicals, stirring time, stir intensity, total dosage of chemicals, and chemicals ratio were analyzed in detail. When adding PAM alone in the slurry, the CST reaches its minimum value of 17.4 s at the PAM dosage of 3 mg·g-1. But when simultaneously adding Al2(SO4)3 coagulant and 3 mg·g-1 PAM in the slurry, the CST decreases to 16.9 s at the Al2(SO4)3 dosage of 1.5 ·g-1. The appropriate operating conditions were experimentally determined as the interval time of adding chemicals of 45 s, the stirring time of 120 s, and the stirring intensity of 40 r·min-1. By means of orthogonal experiment design, the significance of parameters influencing the slurry dewatering behavior is in the order of total dosage of chemicals > chemicals ratios, and the optimal total dosage of chemicals is 4 mg·g-1, with the mass ratio of PAM and Al2(SO4)3 of 1:3.

Huang G.,University of Science and Technology Beijing | Su H.,University of Science and Technology Beijing | Yang W.,China Tin Group Co. | Wei F.,China Tin Group Co. | Yu Y.,China Tin Group Co.
2011 International Conference on Electric Technology and Civil Engineering, ICETCE 2011 - Proceedings | Year: 2011

According to quality of raw water from tongkeng mine, analyzed the factors in the process of coagulation-sediment-filter on the Zn2+ions removal effect in wastewater treatment. Based on static test results, take the dynamic tests on water quantity, dosage of PAC and PAM, dosing way etc. The results show that through experimental parameters optimization, the removal rate can achieve 90.25% by the process of coagulation- sediment-filter to treat mine water with Zn2+ions. The effluent quality can satisfy national integrated wastewater discharge standard requirement. © 2011 IEEE.

Huang G.-Z.,University of Science and Technology Beijing | Zhang Z.-Y.,University of Science and Technology Beijing | Yu Y.-X.,China Tin Group Co. | Yang W.-Z.,China Tin Group Co. | And 3 more authors.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2012

Based on the distinguishing feature of mine water from Tongkeng Mine in south China, a complex coagulation method was selected to treat the mine water. Through single-factor and orthogonal tests, the effects of some factors, such as coagulants, coagulant aid content, pH values, stirring speed, and stirring time, on removing Zn2+ in the mine water were studied and the best level of each factor was determined. The best synergistic effect can be achieved when the volume ratio of polyaluminium chloride (PAC) to polyacrylamide (PAM) is 2:1, and the best treatment effect is obtained when the pH value is 9, the stirring speed is 80 r·min-1 and the stirring time is 10 min. The results of actual water treatment tests show that the removal rate of Zn2+ reaches 93.9%, and the mass concentration of Zn2+ in the discharged water can meet the national emission standards of China.

Cheng Y.,Central South University | Cheng Y.,China Tin Group Co.
Advanced Materials Research | Year: 2012

In the Danchi mineralization belt of Guangxi province, south China, the Dachang tinpolymetallic ore deposit is one of the largest Sn ore deposits in this world. But about the genesis and the ore source, there have been some disputes. In terms of the Dafulou deposit, the mineralization model and deposit mechanism is rather illegibility. By analysing and comparing the lead isotope of three ore deposit (the Changpo, the Lamo and the Dafulou), it show that the correlations of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb of sulfide minerals demonstrate obvious excellent linear relation. So, it is also suggested that the eastern mineralization belt, the middle mineralization belt and the western mineralization belt shared the same ore source. And, according to the features of no.22 ore body, the Dafulou deposit is characterized with the characteristics of the Sedimentary Exhalative Deposit (SEDEX). © (2012) Trans Tech Publications, Switzerland.

Bu X.,Xi'an University of Architecture and Technology | Wang Y.,Xi'an University of Architecture and Technology | Chen J.,China Tin Group Co. | Hu M.,China Tin Group Co.
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2016

A new coordination polymer, namely [Cd2(tdc)2(bpp)(DMA)]n (1, H2tdc = 2, 5-thiophenedicarboxylic acid, bpp = 1,3-bis(4-pyridyl)propane, DMA = N,N-dimethylacetamide), has been successfully obtained via solvothermal reactions of Cd(NO3)2, H2tdc, and bpp. Single-crystal X-ray structural analysis reveals that compound 1 is a twofold interpenetrated three-dimensional (3D) framework with four-connected pcu topology. Moreover, the luminescent properties and thermal stability of 1 were also studied in this work. © 2016 Taylor & Francis Group, LLC.

Bu X.,Xi'an University of Architecture and Technology | Chen J.,China Tin Group Co. | Hu M.,China Tin Group Co.
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2016

A new Zn(II) coordination polymer, namely [Zn2(datrz)2(nic)2]n (1 Hdatrz = 3,5-diamino-1,2,4-triazole, Hnic = nicotinic acid), has been obtained through solvothermal reactions of Zn(NO3)2, Hdatrz and Hnic. The crystal crystallizes in triclinic P-1 space group, a = 9.4379(6) Å, b = 10.0180(6) Å, c = 11.9812(8) Å, α = 73.711(6)°, b = 72.646(6)°, γ = 88.515(5)°, Z = 2. The title compound features a 2D layer structure, which further extends into a 3D supramolecular framework via intermolecular hydrogen bonds. In addition, the luminescent properties of 1 were also investigated at room temperature. Copyright © Taylor & Francis Group, LLC 2016.

Applied Mechanics and Materials | Year: 2013

For flotation characteristics of complex sulfide mineral of low-tin in Guangxi Dachang mine, fluid dynamics software FLUENT was applied to simulate the turbulence intensity of slurry fluid in flotation machine at different inflation pressures. The effect of flow field characteristics was gotten for flotation machine. Simulation results show that the best inflation pressure was 120000 Pa. © (2013) Trans Tech Publications, Switzerland.

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