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Biooxidation Pretreatment Cyanide Leaching of a Flotation Gold Concentrate Chao Zhu1, a, Baoliang Ge 1, b, Zhaoyi Lu1, c, Wen Zhu 2, d 1Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China 2China United Northwest Institute for Engineering Design and Research,xi`an 710082.
In recent years, utilizing biological oxidation process before cyanidation is more and more popular because it’s obvious effect and superiorities such as: low investment, low consumption, simple production process, convenient operation, no pollution, energy resources high efficient utilization[5].Though roasting oxidation and pressure oxidation also favorable for gold leaching, roasting method will produce harmful gas of the environment, and pressure oxidation due to the oxygen equipment and acid autoclave to infrastructure investment is too large, which limits their use[6].This article researched a pretreatment method for a gold flotation concentrate, then recover the gold by cyanide leaching. 2.Materials and Methods The representative ore sample used for this study was obtained from a deposit in southern Sichuan.After ore sample prepared, the medium for bacterium surviving also prepared, the methods are: (NH4)2SO40.15g，KCl0.05g，K2HPO40.10g，MgSO4·7H2O0.5g，Ca(NO3)2·4H2O0.01 g mixed with
International Journal of Mineral Processing 94(2010)28-34 [5] Jiang Tao, Li Qian,Yang Yongbin, Li Guanghui,QiuGuanzhou.Trans.

The Existence of Positive Solutions for Boundary Value Problems of Fractional Differential Equation Jie Gao School of Mathematics and Information Sciences,Weifang University, Weifang, Shandong 261061, China email:gaojie71@126.com Keywords: fractional differential equation; boundary value problem; infinite interval; completely continuous Abstract In this paper, by using Leggett-Williams fixed point theorem, we will study the existence of positive solutions for a class of multi-point boundary value problems of fractional differential equation on infinite interval. 1.
It has been shown that new fractional-order models are more adequate than previously used integer-order models, e.g. fractional derivatives provided an excellent instrument for the description of memory and hereditary properties of various materials and processes.
[6] Xiangkui Zhao, Weigao Ge, Existence of at least three positive solutions for multi-point boundary value problem on infinite intervals with p- Laplacian operator, Journal of Applied Mathematics and Computing, 28(2008), pp. 391-403.

Acknowledgements This work was financially supported by the Anhui Natural Science Foundation (1308085ME80) and Equipment Advanced Research Foundation under (914A17050312JB91202).
Advanced Materials Research, 2013
Journal of Power Sources. 2005, 144: 418-25

It illustrates that the elements that in the oversaturated state begin dissolve out in quantity during one hour insulation, (1) process is dominated, the strength of materials is rising up quickly.
To improve the strength and its uniformity, the coiled steel will be stacked together and cooled slowly. 4 Acknowledge Project supported by the National Natural Science Foundation of China (Grant No. 51074062) and Supported by Educational Commission of Hebei Province, China(Grant No. 12212122D).
Zhou, et al: Microstructure and Property of 700MPa Grade Hot Rolled Dual Phase Steel, Journal of Iron and Steel Research. 21(2009) No 8, p. 24-27 [5].

Materials Acetonitrile and ethyl acetate were HPLC grade and purchased from J.T.Baker (USA).
References [1] Chen Yunyun, Ding Yi, Wang Wei,et,al.Tsinghua science and technology Vol. 12(2007), P389-393 [2] The Pharmacopoeia Comittee of People’s Republic of China .
Journal of Ethnopharmacology, 111, 265–270.

The initial and boundary conditions are for ，； for and，； for and，； for and ，； for and ， for and ，； for and，； 2.3 The parameters for calculation Table 1 Technical features of the calculation Year-round weather information Average temperature （℃） 20.7 Highest temperature （℃） 38.9 Lowest temperature （℃） -10 Average relative humidity （%） 45 Soil physical parameters average temperature in the soil in underground 1m（℃） 22.4 Soil coefficient of thermal conductivity（w/mk） 1.3 Soil density（kg/m3） 1695 Underground heat exchanger parameters Buried tube type horizontal Pipe materials px-b Buried tube chief（m） 50 Pipe diameter（m） 0.016 distance of two tube （m） 0.3 Thecalculation results and analysis Fig2 Changes of Ground temperature Fig3Changes of Ground temperature （Mass Flow as 0.041 kg/s） （Mass Flow as 0.018 kg/s） In the numerical calculation, the average temperature of water–anti-freeze solution is12.4
Acknowledgements: This work was financially supported by the Fluid machinery and engineering provincial key subjects (507907), Thermal energy and power engineering characteristics professional(508057) , The school Key subject (509927);Natural Science Foundation of He Nan Province Department of Education（2010B460011）,He Nan Province Key Research Project(112102210105) .
[3] Zhi Wei Tang,Xiao Yan Shi.]the numerical simulation of the ground source heat pump to U-tube heat exchanger[J] Journal of Beijing university of technology,2006（1）:62-63 [4] Yawzturk C, Andrew D.

The Solution of Problems in Cast Iron Dryer End Covers Designing Hongyu Lu1 2, a, Runhua Tan1, b, Xuexun Bian2, c 1Department of Mechanical Engineering, Hebei University of Technology, Tianjin, China 2Department of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin, China alhy1993@126.com,brhtan@hebut.edu.cn,cxxbian@126.com Keywords: Cast Iron Dryer, End Covers Designing, Moment Shear Force Abstract: Some researches have been done to solve the important problems, such as the shape of end cover and consequence part shear force and bending moment calculation.
High-temperature on the cylinder surface can be used to dry materials, and then condensation of water formed during the drying process is expelled from the other side of the end cover by using a siphon system.
In Chinese [3] Dongjun Zhang, Zhiping Liu: Journal of machine design, Vol. 20, No.20 (2003),P.53-54.

., Metals Science and Heat Treatment, 43(2001), p. 363
L., Journal of Materials Processing Technology. 84(1998), p. 90

Triangular Dislocation Loop Model for Surface Displacement in Indented Thin Films Shinji Muraishi a, Hiromitsu Chinenb , Masaaki Takayac, Kousuke Hara d Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552, Japan a muraishi.s.aa@m.titech.ac.jp,b Chinen.h.aa@m.titech.ac.jp,ctakaya.m.aa@m.titech.ac.jp, d hara.k.aa@m.titech.ac.jp Keywords: Indentation, dislocation, TEM, AFM Abstract.
The applied pressure needed for Vickers indentation was investigated by Tanaka [3], where the elastic recovery associated with the circular prismatic loop arrays were numerically solved by summing an analytical solution for a single prismatic loop field in two phase material [4].
implies that the annihilation of the internal stress is necesally at the bonded interface with Si and its process depneds on the plasticity of the indented material because the tractions and displacements should be conserved for the hard Si substrate.
Vol.1 (1989), p. 11 [4] N.J.Salamon and J.Dundurs, Journal of Elasticity Vol.1 (1971), p. 153 [5] S.Muraishi: submitted to Acta Materialia (2010) Figure 3 Cross-section views of indented Al-4wt%Cu film (a), Al2Cu film (b)

Cerium oxide and CeO2-containing materials have been studied as structural and electronic promoters used for catalysts.
Alam: The Arabian Journal for Science and Engineering.