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Cheng F.,Central South University | Cheng F.,China Nonferrous Metal Guilin Geology and Mining Co. | Wang X.-H.,Central South University | Mo S.-X.,China Nonferrous Metal Guilin Geology and Mining Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2014

Based on the acid-base proton theory, the erosion mechanism after heavy metal pollutants infiltrating into rock is discussed. The extension performances of lead (Pb), cadmium (Cd), copper (Cu), zinc (Zn) are analyzed by using the convection-diffusion model. By way of combining the viscoelastic model and the damage monomer model, a 3D extended-fissile model is established for heavy metal contaminated rock. The deformation rules of invaded surface are discussed under different extension rates. The model fitting results are verified by the data of axial static load tests. The results show that different heavy metal pollutants have different invasion and extension performances in rock, and there is a good agreement between the experimental stress-strain curves of contaminated rock with different lithologies in the same test conditions and the fitting results of the combination model.


Ren M.-D.,China Nonferrous Metal Guilin Geology and Mining Co. | Zhou H.-T.,China Nonferrous Metal Guilin Geology and Mining Co. | He X.-L.,China Nonferrous Metal Guilin Geology and Mining Co. | Zhang C.-L.,China Nonferrous Metal Guilin Geology and Mining Co.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

In this paper, A pure LiFePO4 single crystals was grown by hydrothermal method using carbon coated LiFePO4 as precursor and LiH2PO4 as mineralizer. The crystal is six prism morphology and consisted of three main growth face (010), (101) and (100). The crystal structure was analyzed and the results show that cell structure is D2h 16, Pbnm space group and the parameter include: a=1.03217 nm, b=0.60042 nm, c=0.46889 nm, α=β=γ=90°. Raman spectra of LiFePO4 crystal showed three strong peaks at 949 cm-1, 996 cm-1 and 1068 cm-1 and it can be used as characteristic peaks to distinguish FePO4.


Li C.,Beihang University | Zeng Z.,Beihang University | He X.,China Nonferrous Metal Guilin Geology and Mining Co.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2014

A novel optical sensor for simultaneous measurement of voltage and current is proposed and demonstrated in experiment. The optical sensing unit is only composed of single bismuth silicate (Bi12SiO20, BSO) crystal and two prism polarizers. The BSO crystal exhibits both Pockels electrooptic effect and Faraday magnetooptic effect, thus voltage and current to be measured can simultaneously modulate the probing light wave when transparent axes of the two polarizers are parallel or perpendicular with each other. The frequency of current sensing signal is the same as that of the original current to be measured, meanwhile, that of voltage sensing signal is doubled. Thus current and voltage sensing signals can be simultaneously separated and measured by using two band pass filters. AC current and voltage with industrial frequency in the ranges of 6 A and 200 V were simultaneously measured in experiment by use of single BSO crystal with a size of 6.0×4.0×2.9 mm3.


Shi Y.-H.,Wuhan University | Shi Y.-H.,China Nonferrous Metal Guilin Geology and Mining Co. | Yang Z.-P.,China Nonferrous Metal Guilin Geology and Mining Co. | Song C.-A.,Guilin University of Technology | And 2 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2012

The preconcentration and determination of gold and silver in twenty plants from the copper mining area by ICP-MS was described. The plant samples were decomposed by dry-ashing and aqua regia. 107Ag, 109Ag and 197Au were chosen as determining isotopes and 103Rh and 203Tl were chosen as interna1 standards. The conditions of sample digestion were elected and the interferences on instrument measurement were eliminated through the experiments. The detection limits of method were 0.048 and 1.06 ng·g -1 for Au and Ag. The precisions (n=5) were between 0.85% and 9.05% RSD, and the recoveries were between 93.6%~101.6% (Au, Ag). The method is sensitive quick, simple and has been applied to the analysis of gold and silver in plants from the copper mining area. Under the given analytical conditions, the results showed that the contents of the Au and Ag varied in these diferent plants, the ranging between 0.181~0.99 ng·g -1 for Au and 280~2150 ng·g -1 for Ag respectively. The geochemical anomalies on Ag were discovered in Pteris, Dicranopteris pedata and Bolbitis heteroclita, which can be regarded as prospecting effective indicator plants.


Xu T.,CAS Technical Institute of Physics and Chemistry | Xu T.,University of Chinese Academy of Sciences | Liu L.,CAS Technical Institute of Physics and Chemistry | Wang X.,CAS Technical Institute of Physics and Chemistry | And 4 more authors.
Journal of Alloys and Compounds | Year: 2015

Deep-UV nonlinear optical crystal RbBe2BO3F2 (RBBF) grown by the hydrothermal method was found to have a centrosymmetric structure of R3¯c by powder X-ray diffraction. The structure of R3¯c has cell parameters of a = 4.44223(11) Å and c = 39.6696(12) Å in the lattice where the (BO3)3 - groups turn 60° along each (Be2BO3F2)∞ layer in the a-b plane and it is double size along the c-axis compared with standard R32 structure. As the examined RBBF shows a very low second harmonic generation capability, a stacking fault model was proposed that the hydrothermal RBBF is nonuniform with a mixture of both R32 and R3¯c structures using the DIFFaX program. © 2014 Elsevier B.V. All rights reserved.


Liu Y.,China Nonferrous Metal Guilin Geology and Mining Co. | Zhou Y.,Guangdong University of Technology | Zhang F.,Guangdong University of Technology | Guo C.,Guangdong University of Technology
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2015

Diamond dental tools with diamond particles of 251 μm and 107 μm were fabricated by brazing separately, and used to grind zirconia ceramic. The effect of feed rate and spindle speed on grinding force and the comparison between the diamond tools were studied. Results showed that with the increase of feed rate and spindle speed, the normal grinding force and tangential grinding force increased linearly. The grinding force of brazed dental tool with particle size of 107 μm was less than that of brazed dental tool with particle size of 251 μm. As feed rate increased, brittle fracture expanded to a larger area on the surface of processed zirconia ceramic and chip size increased with a trend of bigger forms. As spindle speed increased, apparent plastic deformations appeared on the surface of processed zirconia ceramic with thinning chips. ©, 2015, Zhengzhou Institute of Abrasives Grinding. All right reserved.


Yuan Y.-H.,China Nonferrous Metal Guilin Geology and Mining Co. | Yin C.-H.,China Nonferrous Metal Guilin Geology and Mining Co. | Yuan Z.-H.,China Nonferrous Metal Guilin Geology and Mining Co. | Xu H.,China Nonferrous Metal Guilin Geology and Mining Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2016

The determination method of arsenic and antimony in tin ore usually adopts spectrophotometry. A new determination method of arsenic and antimony in tin ore by hydride generation-atomic fluorescence spectrometry was established after the sample was dissolved in hydrochloric acid-nitric acid by microwave digestion. The results showed that the sample could be dissolved by microwave digestion with 8 mL of mixed hydrochloric acid-nitric acid (5+3) as solvent. When the concentration of hydrochloric acid was about 0.96 mol/L, the mass concentration of both thiourea and ascorbic acid were 10 g/L, HCl (1+9) was used as carrier liquid, and 20 g/L potassium borohydride solution was used as reducing agent, the calibration curves were plotted based on the fluorescence intensity of arsenic and antimony against the corresponding mass concentration. The linear correlation coefficients were both not less than 0.999 8. The detection limit of arsenic and antimony was 0.044 2 μg/L and 0.020 4 μg/L, respectively. The interference test showed that the coexisting elements in tin ore sample did not interfere with the determination. The proposed method was applied to the determination of arsenic and antimony in tin ore actual samples. The relative standard deviation(RSD, n=6) was 1.1%-1.3% and 0.99%-1.4%, respectively. The recoveries were 99%-104% and 98%-104%, respectively. The certified reference materials of tin ore were determined by the experimental method. The results were basically consistent with the certified values. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Li C.-S.,Beihang University | Zeng Z.,Beihang University | He X.-L.,China Nonferrous Metal Guilin Geology and Mining Co.
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2014

An optical voltage sensor is proposed which uses one single bismuth silicate (Bi12SiO20, BSO) crystal grown by hydrothermal method. The voltage sensing unit is only composed of one block of BSO crystal and two prism polarizers. Experimental results demonstrate that the used BSO crystal sample exhibits obvious linear electro-optic Pockels effect, and can be used for the measurement of alternating voltage. By use of the inherent natural optical activity in the BSO crystal, monotonous and linear voltage measurement ranges of the proposed voltage sensor are larger than those of the conventional voltage sensors using electro-optic crystals without optical activity. The size of the used BSO crystal sample is 6.0 mm×4.0 mm×2.9 mm3. The angle, through which the plane-of-vibration rotates in the BSO crystal due to its optical activity, is about 132° for light wavelength of 633 nm. The measurand voltage is the alternating voltage with industrial frequency of 50 Hz, and is monotonously and nonlinearly measured in the range of 108-1 300 V (root-mean-square amplitude). The output voltage of the sensor is still monotonously changed with measured voltage when the corresponding electro-optic phase retardation reaches 2π. In addition, under the application of a proper stress-induced birefringence in the BSO crystal, the output voltage is linearly changed with measured voltage in a certain voltage range, e. g., 900 V, corresponding voltage measurement sensitivity is 0.027 6 mV/V and nonlinear error is less than 3.1%.


Zhang C.-L.,China Nonferrous Metal Guilin Geology and Mining Co. | Zuo Y.-B.,China Nonferrous Metal Guilin Geology and Mining Co. | He X.-L.,China Nonferrous Metal Guilin Geology and Mining Co. | Zhou H.-T.,China Nonferrous Metal Guilin Geology and Mining Co. | And 3 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2012

The new progress of hydrothermal crystal growth in Guilin were reviewed in this paper. Much has been focused on the growth of KTP, ZnO, BSO, KBBF and RBBF crystals. The difficulties of the crystals grown by hydrothermal method encountered were pointed out and some corresponding solutions were given.


Xie D.,Hunan University | Wan L.,Hunan University | Song D.,Hunan University | Wang S.,China Nonferrous Metal Guilin Geology and Mining Co | And 11 more authors.
Materials and Design | Year: 2015

The kinetic characteristics of Fe-Co-Cu pre-alloyed powders in the pressureless sintering process have been investigated. The expansion ratio, linear shrinkage, densification rate and effect of heating rate on the sintering have been analyzed. Based on the classical Arrhenius curve, the sintering activation energy has been calculated. Results show that the samples have a smaller expansion ratio before contracting when the Fe content is higher, and the final linear shrinkage ratio is larger too. The sintering carries out more efficiently and the final linear shrinkage ratio is larger when the samples at a lower heating rate. In the initial and final stage of sintering, the Arrhenius curve is suitable for the Fe-Co-Cu pre-alloyed powders and diffusion is the main transport mechanism. At the initial stage of sintering the sintering activation energy of Fe25%-Co15%-Cu60% powder is 453.11. kJ/mol, Fe45%-Co15%-Cu40% powder is 638.28. kJ/mol and Fe65%-Co15%-Cu20% powder is 504.6. kJ/mol, respectively. At the final stage of sintering the sintering activation energy of Fe25%-Co15%-Cu60% powder is 31.17. kJ/mol, Fe45%-Co15%-Cu40% powder is 20.09. kJ/mol and Fe65%-Co15%-Cu20% powder is 35.13. kJ/mol, respectively. The sintering activation energy in the middle stage is dominated by not only one diffusion mechanism so it is not suitable for the Arrhenius curve. © 2015 Elsevier Ltd.

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