Xining, China
Xining, China

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Yu X.Y.,Jiangxi University of Science and Technology | Yu X.Y.,Western Mining Co. | Wei X.A.,Jiangxi University of Science and Technology | Zeng A.,Jiangxi University of Science and Technology | And 2 more authors.
Minerals and Metallurgical Processing | Year: 2015

The flotation behaviors of diaspore and three kinds of silicate minerals - kaolinite, illite and pyrophyllite - using an organosilicon cationic surfactant as collector were investigated as functions of reagent concentration and pulp pH. The results show that the organosilicon cationic collector QAS122 is a suitable collector for the flotation of aluminosilicate minerals but has weak collecting ability with regard to diaspore, enabling the flotation separation of diaspore from silicate minerals using QAS122 as collector. The flotation of a bauxite ore was then studied in detail. Finally, a reverse flotation separation process was used to process a low-grade bauxite ore. It was concluded that use of the organosilicon cationic collector is effective. A concentrate with aluminum oxide (Al2O3) to silicon dioxide (SiO2) mass ratio, or A/S, of 9.67 was obtained from natural bauxite ore with A/S of 6.07 at pH of around 11. The Al2O3 recovery rate was 81.72 percent. Copyright 2015, Society for Mining, Metallurgy & Exploration Inc.

Bo F.,Jiangxi University of Science and Technology | Bo F.,Western Mining Co. | Xianping L.,Jiangxi University of Science and Technology | Xianping L.,Western Mining Co. | And 2 more authors.
Minerals Engineering | Year: 2015

Abstract The flotation separation of scheelite from calcite using sodium oleate as collector and acidified sodium silicate as depressant has been studied. The results show that sodium oleate has collecting ability to both scheelite and calcite and the flotation separation of scheelite from calcite cannot be realized if collector is used only. The depressant acidified sodium silicate has selective depression effect on calcite and the optimum ratio of sodium silicate to oxalic is 3:1. The use of acidified sodium silicate as depressant can achieve the flotation separation of scheelite from calcite. Infrared studies and zeta potential measurements showed that the pre-adsorption of acidified sodium silicate interferes with the adsorption of sodium oleate on calcite surface while does not interfere with its adsorption on scheelite surface. © 2015 Elsevier Ltd.

Chen P.-P.,Southwest University of Science and Technology | Zhang H.-P.,Southwest University of Science and Technology | Liu H.-D.,Western Mining Co. | Luo X.-G.,Southwest University of Science and Technology | And 3 more authors.
RSC Advances | Year: 2016

A novel material, the biochar of a konjac-based material (KGMB), was prepared conveniently and economically with chemical activation of hydrothermally synthesized carbon nanospheres. Those carbon nanospheres have small sizes and high surface areas due to the high temperature sintering, which could be used for efficient adsorption of heavy metal ions such as Pb2+ and Cd2+. Detailed adsorption behaviors of the optimized biochar including adsorption isotherms and adsorption kinetics were investigated. The results indicated that the adsorption process is spontaneous, exothermic and pseudo-second-order chemisorption. When the temperature was 298 K, the KGMB dose was 5 mg, the initial concentration of Pb2+ and Cd2+ was both 50 mg L-1, the contact time was 24 h and pH of the ion solution was 5.5, the adsorption capacity reached up to 186.56 mg g-1 for Pb2+ and 129.67 mg g-1 for Cd2+, respectively. What's more, the adsorption capacities of Pb2+ and Cd2+ were 69.34 and 71.06 mg g-1, respectively, after adsorption-desorption process happened three times. Comparisons of the adsorption capacity of various adsorbents for Pb2+ and Cd2+, showed that this biochar is superior to many other adsorbents in terms of adsorption capacity and it is a cheap, efficient and accessible biochar. Thus, KGMB is a promising candidate for wastewater treatment. © 2016 The Royal Society of Chemistry.

Zhang H.-P.,Southwest University of Science and Technology | Zhang H.-P.,Western Mining Co. | Luo X.-G.,Southwest University of Science and Technology | Lin X.-Y.,Southwest University of Science and Technology | And 4 more authors.
Desalination | Year: 2016

Carboxymethyl inulin (CMI) is one of the most promising biomass materials for scale inhibition. Its potential applications as a scale inhibitor have attracted much research attention. Understanding the interactions between CMI and calcite surfaces is very important for the design of scale inhibitors. In this study, molecular dynamics simulations were carried out to investigate effects of temperature, CMI chain length, and calcite cleavage on the interactions between CMI and calcite. The results indicate that for the same mass of CMI (with different degrees of polymerization, n = 1, 3, 5), CMI exhibits different abilities in inhibiting the growth of calcite crystal in the order of CMI (n = 5) > CMI (n = 3) >. CMI (n = 1) for calcite (012), (104), 11{combining overline}0, and (110) surfaces. For the calcite (012) surface, the inhibition ability is similar for CMI (n = 3) and CMI (n = 5). For the aqueous environment, comparison of the results of water effects with the results for the CMI-calcite surfaces without water showed a similar trend: the interaction between the CMI and the calcite (012) surface was greater than that of the CMI with the other calcite surfaces (104), (110), and 11{combining overline}0. However, the interactions between the CMI and the other calcite surfaces (104), (110), and 11{combining overline}0 were apparently weakened by the water environment. The results also show that temperature influences the interactions between CMI and calcite surfaces. This study provides important information for CMI potential applications as calcite inhibitor. © 2015 Elsevier B.V.

Fu J.,CAS Guangzhou Institute of Geochemistry | Fu J.,University of Chinese Academy of Sciences | Liang X.,CAS Guangzhou Institute of Geochemistry | Zhou Y.,Guilin University of Technology | And 5 more authors.
Precambrian Research | Year: 2015

Neoproterozoic granitic rocks in the Dakendaban Group are widely distributed throughout the Xitieshan area as the old basement in North Qaidam, NW China. The granitic rocks are composed predominantly of K-feldspar, plagioclase, quartz, muscovite and biotite, with subordinate zircon, garnet, titanite and sillimanite. Two granitic rock samples yielded ages of 930 ± 6. Ma and 918 ± 6. Ma using LA-ICPMS zircon U-Pb dating, which are interpreted as the protolith formation age of the granitic rocks, and reflecting an important Neoproterozoic magmatic event in the Xitieshan area. Geochemical data suggest that the granitic rocks are characterized by high SiO2, K2O, and CaO/Na2O ratios (0.48-1.04), with LREE enrichment and strong Eu negative anomalies (Eu/Eu*=0.44-0.51), and negative anomalies of Nb, Ta, Ti, Zr, and Hf. These rocks have consistent Nd isotope compositions with εNd(t) values ranging from -4.83 to -4.27, while the sample 2011ZJ18-3 yielded the negative εHf(t) values ranging from -6.7 to -1.3, and tDM2(Hf) model ages ranging from 1.9 to 2.2Ga. These geochemical and zircon Lu-Hf isotopic features suggest that the granitic rocks in the Xitieshan area belong to the S-type granite, which were mainly derived from the partial melting of the Paleoproterozoic continental crust material (1.9-2.2Ga) that were predominantly composed of metagreywackes and subordinate metapelitic sources. Based on the regional tectonic reconstruction, we propose that the studied rocks occurred as syn-orogeny on an active continental margin in a compressional environment, which resulted from the Neoproterozoic arc-continent collision and subsequently continent-continent collision, leading to the significant continental growth. The Early Neoproterozoic tectonothermal event in North Qaidam shares many affinities with that of the Tarim block and South China block (Yangtze block) that were associated with the final consolidation of block at the Jinning orogeny, showing an agreement with the formation of Rodinia. The Early Neoproterozoic S-type granitic magmatism in NW China, including the Qaidam and adjacent blocks, is an important episode of continental crust reworking. © 2015 Elsevier B.V.

Jiang H.,Central South University | Xiao Y.,Western Mining Co.
Advanced Materials Research | Year: 2012

In this paper, based on the experiment on pure minerals, namely, galena, sphalerite and pyrite, it is concluded that the appropriate pH range for galena flotation is 8.5-10.5, that for sphalerite flotation is 7-10.5 and for pyrite is 2.5-6.5. For galena, sphalerite and pyrite, butyl xanthate has a better collecting performance than ammonium dibutyl dithiophosphate. Both Na 2SO3 and ZnSO4 have a relatively weak inhibitory effect on galena. As for sphalerite, the mixing of Na 2SO3 and ZnSO4 has a better inhibitory effect than when they are used alone, with the best inhibitory effect obtained when the proportion of Na2SO3 and ZnSO4 is 1:2 and their dosages are respectively 100mg/L and 200mg/L. In zinc flotation, CuSO 4 demonstrates an apparent activating effect on the inhibited sphalerite with its appropriate dosage at 2*10 -4 mol/L. In actual separation and selection of ore, when the grades of lead, zinc and silver in cyanide tailings are respectively 2.41%, 3.77% and 272g/t, a fairly good index is obtained where the Pb concentrate is of a grade of 33.41% with its silver grade of 4051.57g/t and the grade of Zn concentrate is 59.67% with its silver grade of 798.08g/t. © (2012) Trans Tech Publications, Switzerland.

Xu B.,Central South University | Xu B.,Western Mining Co. | Zhong H.,Central South University | Jiang T.,Central South University
Minerals Engineering | Year: 2011

Two-stage countercurrent oxygen pressure acid leaching process was developed to recover valuable metals from Gacun complex copper concentrate. It is unusual that tetrahedrite, whose treatment has been rarely studied, is the primary copper mineral of a concentrate. Most of silver also occurs in the mineral. The optimum operating parameters of the first stage and the second stage were established by conditional tests. Pilot scale tests ran smoothly, and the average overall leaching percentages of copper and zinc were as high as 96.2% and 97.5% respectively while the average overall leaching percentages of Fe, As and Sb as impurities were only 8.5%, 6.5% and 0.8%. Pb and Ag were not dissolved and stayed in the second stage leaching residue. © 2011 Elsevier Ltd. All rights reserved.

Hu J.,University of Science and Technology Beijing | Chen Y.,University of Science and Technology Beijing | Huang Q.,Western Mining Co.
ICSESS 2011 - Proceedings: 2011 IEEE 2nd International Conference on Software Engineering and Service Science | Year: 2011

A synchronization algorithm for FBMC is proposed by combination of CAZAC sequence. Using the CAZAC sequence as the pilot symbols, timing synchronization and frequency synchronization of the FBMC system are realized. Considering the effect of fading on the synchronization, the algorithm combining the CAZAC sequence is rational. Computer simulations verify that the estimation error is about 1e-4 under ordinary signal to noise ratio conditions. © 2011 IEEE.

Kang Y.-L.,Central South University | Kang Y.-L.,Western Mining Company | Liu J.-S.,Central South University | Cao Y.-H.,Central South University
Northwestern Geology | Year: 2013

Dehelongwa copper-gold deposit is a typical porphyry-type copper-gold deposit in the west Qinling mineralization belt, occurring mainly in fracture zone. Studies on quartz fluid inclusions show three main types of inclusions, namely H2O-rich, CO2-rich and saline daughter mineral inclusions. Microthermometry data suggests that prior to mineralization, the inclusion is powerful intrusion magmatic fluid, rich in Na+, K + and so on. In the metallogenic period, the inclusion is NaCl-unsaturated magmatic fluid of high temperature and high salinity, with a boiling feature. After mineralizaion, the inclusion is a H2O-NaCl-KCl system with moderate temperature, medium-low salinity and low density. The study shows that the ore-forming of copper and gold is mainly caused by the changes in temperature, salinity and pressure, the open formation, the increasing oxygen fugacity, and the declining fluid pH value.

Wang C.,University of Science and Technology Beijing | Wang M.,University of Science and Technology Beijing | Li Y.,Western Mining Co. | Shi S.,University of Science and Technology Beijing
Shuju Caiji Yu Chuli/Journal of Data Acquisition and Processing | Year: 2011

A cognitive radio spectrum detecting method based on compressed sensing is proposed. The method adopts the parallel segmented compressed sampling method and the reconstruction algorithm based on indices back-tracing. After analyzing the performance difference of different reconstruction algorithms, parallel segmented compressed sampling method is described. The influence between segment number and reconstruction probability of CoSaMP and OMP is analyzed by simulation. Moreover, estimation method of frequency division is also described.

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