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Xining, China

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

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. Source

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

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. Source

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

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. Source

Kang Y.-L.,Central South University | Kang Y.-L.,Western Mining Co. | Liu J.-S.,Central South University | Cao Y.-H.,Central South University
Northwestern Geology

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. Source

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.

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. Source

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