Guilin Research Institute of Geology for Mineral Resources

Guilin, China

Guilin Research Institute of Geology for Mineral Resources

Guilin, China

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Yu J.,CAS Technical Institute of Physics and Chemistry | Yu J.,University of Chinese Academy of Sciences | Liu L.,CAS Technical Institute of Physics and Chemistry | Jin S.,CAS Institute of Physics | And 7 more authors.
Journal of Solid State Chemistry | Year: 2011

The structure of the hydrothermal-grown nonlinear optical crystal KBe 2BO3F2 was investigated. A new structure of the R3c space group with cell parameters of a=4.422(1) Å and c=37.524(3) Å was obtained by powder X-ray diffraction and Rietveld refinement. The new structure is a 1×1×2 superstructure of the previously reported R32 structure with a different stacking sequence of (Be2BO 3F2)∞ layers along the c axis. The relationship between the refined structure and the experimental results is discussed. A stacking fault mechanism is proposed for the formation of the superstructure as well as the nonuniformity of the hydrothermal-grown KBBF crystals. © 2011 Elsevier Inc. All rights reserved.


Zhang H.,East China Institute of Technology | Cao J.,Guilin Research Institute of Geology for Mineral Resources | Sun H.,East China Institute of Technology
Dizhen Dizhi | Year: 2010

Using experimental techniques, the paper investigates the transmitted magnetic moment, the turnoff time, and the change of induced signal with the turns of the transmitter and receiver loops of multiturn small coincident configuration, respectively. Comparison is made between the two experimental methods, i. e. changing the receiver loop turns with fixed transmitter loop turns and vice versa, to find out the turns more suitable to geological response. Meanwhile, comparative test is done using the wire frame of loop length of 0. 5m × 0.5m and 1m ×1m, respectively. Through the analyses on the transmitted magnetic moment, the turn-off time, the relations of induced signal intensity with the loop turns and the length, we find the reasonable small multi-turn coincident loop configuration. The result indicates that the transmitted magnetic moment increases with the increased transmitter loop turns and length; the turn-off time increases proportionally with the transmitter loop turns, but has nothing to do with the receiver loop; and the induced signal intensity has a proportional relation with loop turns, with the receiver loop turn to be dominant, comparatively.


Zhao L.,CAS Nanjing Institute of Geography and Limnology | Zhao L.,University of Chinese Academy of Sciences | Deng Y.-R.,CAS Nanjing Institute of Geography and Limnology | Deng Y.-R.,Guilin Research Institute of Geology for Mineral Resources | And 3 more authors.
Huanjing Kexue/Environmental Science | Year: 2012

In this study, N-doped Ta2O5 samples which have strong absorption in visible domain, were prepared by the nitridation of Ta2O5 under NH4 flow and then added into photo-Fenton-like system to enhance Fe3+ reduction and atrazine degradation under visible light irradiation. The sample prepared at 700°C under a NH3 flow rate of 0.3 L·min-1 for 6 h showed the highest level of photocatalytic activity for Fe3+reduction. The influence of various operational parameters such as the light intensity, input of N-doped Ta2O5, pH and initial concentrations of Fe3+, H2O2 and atrazine were investigated. And the changesof H2O2 during the degradation were measured to explain the effect of the operational parameters. The degradation ratio of atrazine reached 97% after 60 min irradiation by 500 W Xe lamp under the conditions of pH=2.6, [atrazine]0=18 mg·L-1, [H2O2]0=2.5 mmol·L-1, [Fe3+]0=0.5 mmol·L-1 and the input of N-doped Ta2O5=0.6 g·L-1.


Jin C.-G.,Wuhan University | Li Z.,Wuhan University | Zhang C.-L.,Guilin Research Institute of Geology for Mineral Resources | Huang L.-X.,CAS Fujian Institute of Research on the Structure of Matter | Xie H.,Wuhan University
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2011

The content and distribution of niobium, crystal structure and the characteristic peaks of chemical bond in the Nb: KTP crystals grown by flux and hydrothermal method were investigated by LA-ICP-MS, X-ray diffraction analysis, micro laser Raman spectroscopy. The effects of niobium doped and crystal growth methods on structure and Raman spectrum of Nb:KTP crystals were analyzed. The results show that the stoichiometry of potassium reduced as niobium doped content increasing in Nb:KTP crystals. The unit cell volume is under the control of synergistic reaction by blockage effect and expansion effect. The unit cell volume in crystals grown by flux method is bigger than those grown by hydrothermal method when the raw material mixture ratio is same, so the growth method could be distinguished by unit cell volume. The interaction of TiO 6 octahedral and PO 4 tetrahedral is changing after Nb entered crystal lattice, thus, a few of characteristic peaks are drift.


Li X.,Chinese Academy of science | Wang C.,University of Maine at Presque Isle | Mao W.,Chinese Academy of science | Xu Q.,Guilin Research Institute of Geology for Mineral Resources | Liu Y.,Guilin Research Institute of Geology for Mineral Resources
Ore Geology Reviews | Year: 2014

The Hahaigang W-Mo polymetallic skarn deposit is located in the central-eastern part of Gangdese tectono-magmatic belt in Lhasa terrane, Tibet. The deposit was discovered in 2007 with currently proven 46milliontons of WO3 ores, 12milliontons of Mo ores, and 1.31milliontons of combined Cu-Pb-Zn ores, at an average grade of 0.20% WO3, 0.07% Mo, 0.026% Cu, 0.49% Pb, and 3.1% Zn. Ore bodies occur in veins or disseminations, and are confined within the NE-striking Dalong fault zone which is hosted by the Lower-Permian Pangna Group of dominantly quartz sandstone and slate. Several granitic plutons are exposed in the area or known from drill-holes. Ages of these granitic plutons are determined by using zircon U-Pb LA-ICP-MS method. For example, the biotite monzogranite yields a 206Pb/238U-207Pb/238U concordia age of 58.66±0.90Ma and a weighted mean 206Pb/238U age of 57.02±0.42Ma. The granite porphyry yields a 206Pb/238U-207Pb/238U concordia age of 109.1±8.9Ma and a weighted mean 206Pb/238U age of 114.0±2.6Ma. The biotite monzogranite yields a weighted mean 206Pb/238U age of 56.1±1.1Ma. Re-Os isochron age of 63.2±3.2Ma from 5 molybdenite samples collected from the W-Mo skarn ores is also obtained in this study. The zircon U-Pb and molybdenite Re-Os geochronological data suggest that the W-Mo mineralization was not temporally associated with any of the dated igneous plutons. However, the molybdenite Re-Os age of 63.2±3.2Ma indicates that the W-Mo mineralization might have occurred during the main India-Eurasia collision that was initiated around 65Ma. Microprobe analysis of ilvaite that occurs in two generations in the W-Mo skarn ores reveals a close relationship to Ca-Fe-F-rich hydrothermal fluids, which were probably derived from deeply-seated magmas. We suggest that ascent of the fluids was strictly controlled by the ore-controlling Dalong fault zone, and that chemical interaction and metasomatism between the fluids and the Lower-Permian Pangna quartz-feldspathic host rocks produced the ilvaite and the W-Mo polymetallic skarn deposit during the main India-Eurasia collision. Although the majority of the polymetallic deposits in the Gangdese belt are reported to be either pre- or post-main collision, it is evident from this study that the main collision also produced W-Mo polymetallic mineralization within the belt. © 2013 Elsevier B.V.


Yang S.-X.,JiShou University | Yuan Z.-Z.,JiShou University | Li Z.-Y.,JiShou University | Long H.,JiShou University | Tang W.-J.,Guilin Research Institute of Geology for Mineral Resources
Huanjing Kexue/Environmental Science | Year: 2012

An extensive sampling was conducted from 4 Manganese mine sites and 5 Lead/Zinc mine sites in Huayuan, Xiangxi. The total and diethylenetriaminepentaacetic (DTPA)-extractable heavy metal (Mn, Pb, Zn, Cu and Cd) concentrations were determined and the heavy metal contamination of mine soils was assessed with pollution index. A principal component analysis (PCA) was performed to identify the key parameters and a simple linear regression was employed to evaluate the relationships between the total and DTPA-extractable heavy metals. The results showed the following: (1) The mine soils were characterized by elevated levels of Mn, Pb and Cd in terms of Hunan soil background concentrations, being 8.7, 21.5 and 2.9 times of their local soil background values, respectively. According to China Environmental Quality Standard for Soils (GB 15618-1995), most Pb and Cd exceeded the threshold values of Class III. (2) Pollution index showed the mine soil was slightly polluted by Pb and moderately to severely polluted by Cd. Comprehensive pollution index indicated slight to moderate pollution for Manganese mine and moderate to severe pollution for Lead/Zinc mine, respectively. (3) The DTPA-extractable Pb and Cd concentrations were relatively high in Manganese and Lead/zinc mine soils and their fractions in comparison to the total metal concentrations exceeded 10%. A significant positive correlation was observed between DTPA-extractable and total concentrations of soil Mn, Pb, Zn and Cd (P<0.01). The principal component analysis showed the total and DTPA-extractable Mn, Pb, Zn and Cd were the key factors resulting heavy metal contamination of mine soils. Therefore, various protective measures should be taken to avoid heavy metal contamination.


He X.,Guilin Research Institute of Geology for Mineral Resources | Zhou H.,Guilin Research Institute of Geology for Mineral Resources | Zhou W.,Guilin Research Institute of Geology for Mineral Resources | Hu Z.,CAS Technical Institute of Physics and Chemistry | And 5 more authors.
Journal of Crystal Growth | Year: 2012

In this paper the solubility and optical activity of Bi 12SiO 20 (BSO) single crystals grown in aqueous NaOH under hydrothermal conditions were reported. BSO was found to have a positive solubility coefficient from 350 to 400 °C in 0.5-3 M NaOH, as well as a positive dependence on mineralizer concentration. The reason why additional SiO 2 should be introduced in the mineralizer to grow high quality BSO was analyzed. High quality and colorless BSO crystals were grown using 4 M NaOH as a mineralizer and additional 3 wt% SiO 2 introduced in the mineralizer. Results showed that the optical activity of hydrothermal colorless BSO was superior to that of BSO grown by the Czochralski (Cz) method. © 2012 ElsevierB.V. All rights reserved.


Mou X.-S.,CAS Technical Institute of Physics and Chemistry | Mou X.-S.,University of Chinese Academy of Sciences | Hu Z.-G.,CAS Technical Institute of Physics and Chemistry | Zhang C.-L.,Guilin Research Institute of Geology for Mineral Resources
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2010

CaB8O11(OH)4 crystal was synthesized within hydrothermal system of CaO-H3BO3-H2O during 280-350 °C using H3BO3 and CaO as raw materials. It was characterized by the following tests-XRD, TG-DSC, FT-IR, SHG and UV-Vis-NIR. The output of SHG equals to 1-2 times of KDP with the same size of grain and the structural aspects was discussed. The transmittance between 320 and 750 nm was up to 80%.


Yu J.,CAS Technical Institute of Physics and Chemistry | Yu J.,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 5 more authors.
Journal of Crystal Growth | Year: 2011

Sizeable crystals of KBe2BO3F2 (KBBF) were successfully grown by the hydrothermal method, but their conversion efficiency of second harmonic generation (SHG) was much lower than that of the flux grown crystals. In order to find the reason, extensive studies on defects in hydrothermal-grown KBBF crystals were carried out for the first time. Dislocations, grain boundaries and twins were revealed and observed on the (0 0 1) plane of hydrothermal-grown KBBF crystals by chemical etching and microscopy. X-ray rocking curves indicate the hydrothermal-grown crystals are of poor crystalline quality. Moreover, powder X-ray diffraction measurements show some small unidentified peaks for hydrothermal-grown KBBF crystals. Powder SHG intensities of hydrothermal-grown KBBF crystals were found to be several times lower than those of the flux grown ones. These indicate the hydrothermal-grown KBBF crystals may contain structural defects. © 2010 Elsevier B.V. All rights reserved.


Li X.,CAS Technical Institute of Physics and Chemistry | Li X.,University of Chinese Academy of Sciences | Hu Z.,CAS Technical Institute of Physics and Chemistry | Lu T.,CAS Technical Institute of Physics and Chemistry | And 2 more authors.
Optical Engineering | Year: 2012

Potassium titanyl phosphate (KTP) is mostly used in all-solidstatelasers as a good nonlinear optical crystal. Knowledge of variations inthe weak absorption of different types of KTP crystals is important forthe application. In this study, the flux-grown KTP crystals with titanium from TiO2, TiCl 4, and Ti(OC4H9)4, respectively, and the hydrothermal grown KTP crystal were investigated. The weak absorption values of the KTP crystals were measured at 1064 nm and 532 nm by photothermal common-path interferometer. The weak absorption values of four samples were 100 ppm cm-1, 800 ppm cm-1, 45 ppm cm-1,1064 ppm cm-1 at 1064 nm, and 2.6 × 104 ppm cm-1, 1.6× 105 ppm cm-1, 1.2 × 104 ppm cm-1, 2.25 × 102 ppm cm-1 at 532 nm, respectively. The results showed that the weak absorption values of the flux-grown KTP with titanium from Ti(OC4H9)4 and the hydrothermal-grown KTP were low values at 1064 nm. In addition, the weak absorption value of the hydrothermal-grown KTP was at least two orders of magnitude lower than that of the flux-grown KTP at 532 nm. From the results, we concluded that the KTP grown by titanium from Ti(OC4H 9)4 represented a better quality than the other two flux-grown KTP crystals. The quality of the hydrothermal-grown KTP was obviously better than the flux-grown KTP. © 2012 Society of Photo-Optical Instrumentation Engineers (SPIE).

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