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The factors which influence the quality of grinding surface are related with low-temperature compressed air, specimen materials, grinding wheel, et al.
In this paper, self-developed cooling-air generator is used to test green grinding performances: specimen material is 40Cr.
In this experiment, the material of specimen for the test is 40Cr.
The material for the test is 40Cr.
[8]M.Rahman, A.Senthil Kumar and M.U.Salam: International Journal of Machine Tools & Manufacture.Vol. 42(2002),p. 539 [9] Itoigawa, F., Childs, T.H.C., Nakamuraa, T., Belluco, W in:Wear,Vol.260(2005),p.339 [10]Dhar, N.R., Islam, M.W., Islam, S., Mithu, M.A.H in: Journal of Materials Processing Technology, Vol.171(2006),p.93

China, 410083 2 State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences，P.
SLS is superior to other RP techniques because of the wide range of materials it can process.
[4] Cijun Shuai, Chengde Gao：Journal of Biomedical Nanotechnology, Vol. 6, 2010, pp. 1-5
Steven：Journal of Sound and vibration, Vol. 230, No. 2, 2000, pp. 357-378
Journal of Materials Science: Materials in Medicine, Vol. 17, 2006, pp. 517-521.

Materials and Methods Obtaining steel.
Molaei and A, Ekrami: Materials Science and Engineering A Vol. 527 (1-2) (2009), p. 235
Wilkinson: Materials Science & Engineering A Vol. 516 (1-2) (2009)
Tumuluru: Welding Journal (2006), p. 31
Erdogan: Journal: Scripta Materialia Vol. 48 (5) (2003), p. 501

In the choice of materials, this paper presented a method for the re-combination of recycled materials.
Some scholars describe green product life cycle includes a collection of raw material, preparation of raw materials, manufacturing, packaging, transportation, sales, use, recycling (recycle) closed chain ring.
Chinese Journal of management science, 2009, 12 (4) [2] Liu Zhifeng, Liu Guangfu.
Science & technology, 1997 (4): 48-50
Environmental science, 1999,19 (1): 63 -66

Mechanical Materials and Manufacturing Engineering II, 2013, 248: 316-319
Advanced Engineering Materials and Technology Ⅲ, 2013, 750-752: 2150-2155
Journal of Lanzhou University (Natural Sciences).
Karger-Kocsis: Journal of Applied Polymer Science Vol. 115(3) (2010), p.1651 [8] A.
Saffar: Journal of Materials Science Vol. (2010), p.1 [9] Wen Shizhu, Huang Pin.

The inner and outer molds are of two different materials.
[2] Nadella R, Eskin D G, Du Q, Katgerman L, Macrosegregation in direct-chill casting of aluminium alloys, Progress in Materials Science. 53 (2008) 421–480
[8] Steinbach S, Ratke L, The effect of rotating magnetic fields on the microstructure of directionally solidified Al–Si–Mg alloys, Materials Science & Engineering A. 413-414 (2005) :200-204
[9] Zoqui E J, Paes M, Es-Sadiqi E, Macro- and microstructure analysis of SSM A356 produced by electromagnetic stirring, Journal of Materials Processing Technology. 120 (2002) 365-373
The effect of grain refining on macrosegregation and dendrite arm spacing of direct chill cast AA5182, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 34 A (2003) 1513–1523.

Current Situation and Outlook on Biological Treatment of Wastewater in Metallic Mine Siqing Liu1,a, Baoxu Song 1,*, Min Zhang1,b,Wanping Wang1,c 1 Department of Mineral Processing Engineering, Kunming University of Science and Technology, Kunming 650093, China a690880140@qq.com, *Corresponding author: 647647@163.com, b282179895@qq.com, c578607690@qq.com Keywords: Mining industry; Wastewater; Biological treatment Abstract: Wastewater in mining and concentration operations is of high acidity, and contains a vast array of heavy metal ions, and some organic compounds.
Biosorption can be defined as the removal of metal or metalloid species, compounds and particulates from solution by biological material [9].
[5] Johnson and Hallberg: submitted to Reviews in Environmental Science and Biotechnology (2002) [6] Volesky, Bohumil in: Biosorption of Heavy Metals.
Florida (1990) [7] Velásquez, Lina, Dussan, Jenny: submitted to Journal of Hazardous Materials (2009)
[9] GaddGM: submitted to New Phytologist (1993) [10] Diaz E, in: Microbial biodegradation: Genomics and Molecular Biology, Caister Academic, Norfolk, UK (2008) [11] Baojun Wang, Huifang Yang: submitted to Journal of Chongqing Environmental Science (1996) (in Chinese) [12] Pin Wang, Fude Li: submitted to Journal of Environmental Science (1994) [13] Candy M p: submitted to Journal of Foreign Metal Mine (2000) (in Chinese) [14] Sergey Kalyuzhnyi, Claudia de Leon Fragoso, Jesug Rodriguez Martinez: Proc. 8th International Conf. on Anaerobic Digestion, 3, Sendai, Japan (1997) [15] Aoyu Tian, Jichun Chen: submitted to Journal of Environmental Technology (2003) (in Chinese)

Acknowledgements This work was financially supported by the national natural science fund of China (51075345).
Literature References [1]Bing Wang, Bingyuan Han: submitted to Journal of Forest Engineering In Chinese(2008)
[2]Zhehe Yao, Deqing Mei: submitted to Journal of Mechnical & Electrical Engineering Magazine In Chinese (2006)
[5]Ling Zheng,Yinong Li,Yong Hu,Xu Tan:submitted to Journal of Vibration Enginerring In Chinese (2008)
[6]Chao Xiong, Xiaohai Shen, Jian Zheng, Chunting Ma, Xunlai He: submitted to Journal Magnetic Materials and Devices In Chinese (2008)

However, some disadvantages, such as longer construction cycle , lower construction quality, serious waste of materials or labours and lower economic benefits, and so on, still exist in different degree.
Journal of Chongqing Inst.
Of Architecture & Engineering, 1994, 16(3); 72-76 [2] ZHANG Peihui, YE Shaoyou Journal of Hefei University of Technology(Natural Science Edition), 2007, 30(1): 100-103 [3] FENG Yong, HE Jianxin.
Journal of Chang’an University (Natural Science Edition), 2004, 24(6): 67-70 [5] FENG Yong.
Beijing: Science Press, 2003: 220-230 [7] XU Jiuping, WU Wei.

Experimental materials and methods Mg-8.9wt%Al-0.53wt%Zn alloy cast ingots (direct casting and air cooling) with an outer diameter of 160mm are adopted as the materials for experiment.
So, the tensile strength of the material becomes less than that when the temperature is 390 ºC, the plasticity of the material decreases continuously.
References [1] H.T.Zhou, C.J.Ma, X.Q.Zeng, W.J.Ding: Materials Review, Vol.17-11 (2003), p.16 [2] T.
Diaka: Materials Science and Engineering A, Vol.496 (2008), p.247 [7] Q.Guo, H.G.Yan, Z.H.Chen, H.Zhang: Journal of Plasticity Engineering, Vol.7 (2006), p.739 [8] P.
Uchida: Materials Science and Engineering, Vol.434 (2006), p.131 [10] M.Shahzad, L.Wagner: Materials Science and Engineering A, Vol.506 (2009), p.141