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Fang Z.-H.,Central South University | Wang L.-G.,Central South University | Xiong Z.-Y.,Zhongye Changtian International Engineering Co.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

To analyze the mining disturbance influence scope in underground metal mine and its influence degree on ground structures more reasonably and quantitatively, combined with engineering practice in Hualinggou iron mine, we proposed that using Micromine to create true three-dimensional geological model in this paper, using hexahedral discrete technology to mesh the corresponding geological model, and using coupling technology and C language to reconstruct the numerical model in FLAC3D. On this basis, we analysed the influence scope of underground mining disturbance and its influence degree on ground tailings dam. The results show that, first, using coupling technology can create more complex three-dimensional geological model. Second, using numerical calculation method can de-lineate mining influence scope accurately. Finally, using this technology can analyze underground mining disturbance influence on ground structures in the quantitative view.

Fang Z.,Central South University | Wang L.,Central South University | Peng N.,Zhongye Changtian International Engineering Co. | Jiang Q.,Zhongye Changtian International Engineering Co.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2015

In order to accurately analyze high and steep arc slope security and stability in whole and in part, and provide references for high and steep slope design in open pit, finite difference strength reduction method is used to analyze slope stability and the whole slope safety coefficient is obtained. And calculation element safety degree is used to get the part slope safety coefficient. Convergence of maximum nodal displacement with time-step curves are adopted as slope stability failure criterion, and thus big errors caused by artificially specified tolerance when other criteria are used are avoided. Taking an iron mine southwest slope for example, we write strength reduction method, failure criterion and safety degree programme with FISH language and use the programme to calculate the problem. The results show that the methods of finite difference strength reduction, the failure criteria based on convergence of maximum nodal displacement with time-step curves and safety degree of calculation element is fit for studying stability of high and steep arc slope stability. At the same time, the method put forward a new idea for designing high and steep arc slope. © 2015, Chongqing Medical University. All right reserved.

Zhang J.-Y.,Central South University | Zhang X.-H.,Central South University | Zhou J.-M.,Central South University | Dai C.-D.,Zhongye Changtian International Engineering Co. | Xie D.-J.,Central South University
Kang T'ieh/Iron and Steel (Peking) | Year: 2011

The sinter size, mass flow of inlet, material height, porosity and inlet temperature are the main parameters in affecting the waste heat recovery efficiency. Through researching a 360 m2 sinter cooler in an iron and steel company and heat transfer characteristics in sinter cooling process, the mathematical models of heat transfer were established. Based on the FLUENT 6.3, the two-equation energy model of non-equilibrium thermodynamics in porous media was built up by user-defined-scalar and user-defined-function. The five parameters were optimized to improve the waste heat recovery efficiency of the sinter cooler, and the optimal combination of these parameters was approved by orthogonal experimental method. Comparing the test data and the model prediction, it is shown that the model prediction and the real operation are in good agreement, this study provides a reliable theoretical basis in waste heat recovery efficiency in sinter.

Gong S.,Xiangtan University | He F.,Xiangtan University | Liu K.,Zhongye Changtian International Engineering Co. | Long X.,Xiangtan University
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2015

Aiming at the problem of using high-speed air jet to impact granular material layer, the parameter simulation model of high speed air jet is built by using realizable κ-ε turbulence model. The influence of nozzle diameter, jet distance on center axial velocity of jet is discussed on the basic of verifying the presented model feasibility, and the relations between jet distances, nozzle diameter and stagnation point pressure are obtained. The truck scale test platform of single-hole is established, and the experimental tests have been finished to obtain the relation curve between impacting mass and spray distance under different jet pressure. The process of using air jet to impact the iron granular layer is simulated by using the best spray distance length, which is obtained by experimental test. The mass distribution around the hole formed by jet impact is achieved by simulating method, and the variation of depth and diameter of hole with jet pressure is given. The results obtained by simulating are agreement with the test ones. It can provide guidance to use high-speed air jet to penetrate the granular material layer in the practical application. ©, 2015, Journal of Mechanical Engineering. All right reserved.

Qin W.,Central South University | Yang C.,Central South University | Lai S.,Zhongye Changtian International Engineering Co. | Wang J.,Central South University | And 2 more authors.
Bioresource Technology | Year: 2013

The leaching of chalcopyrite by moderately thermophilic microorganisms was investigated by employing cyclic voltammetry (CV), accompanying with the leaching behavior elucidation. Leaching experiment showed that there was clear benefit in leaching chalcopyrite within the low solution potential (below 400. mV vs. SCE), compared to the high potential leach (above 550. mV vs. SCE). Simultaneous maintenance of an appropriate concentration of total dissolved iron was necessary and also beneficial to leach chalcopyrite. The leaching results showed the existence of an optimum pH in the leaching of chalcopyrite by the moderately thermophilic microorganisms. The analysis of CV results revealed that the chalcopyrite was reduced to a series of intermediate products (such as talnakhite, bornite and chalcocite) in the cathodic, and then the intermediate product (chalcocite) was oxidized in the anodic. © 2012 Elsevier Ltd.

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