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	1. Flotation seperation of low grade and complex rutile ore in Zaoyang and interaction of rutile with octyl hydroxamic acid
	WANG Jun,LIU Bei,CHENG hongwei,LI Kaiyun,QIN Wenqing,QIU Guanzhou
	Mine Engineering and Technology 19 March 2015
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	Abstract:The flotation separation of rutile ore in Zaoyang was investigated by raw ore experiments and pure mineral tests. The mechanism of rutile with octyl hydroxamic acid (OHA) as collector was further studied by Zeta potential measurement and Infrared spectrum measurement. Raw ore experiment results indicate that rutile can be recycled effectually by using C5~9 hydroxamic acid as collector. The rutile grading of flotation concentrate can reach to 43.25% with the recovery of 69.10%.The pure mineral tests indicate that octyl hydroxamic acid(OHA) is an effective collecter of rutile and andradite, and rutile can be activated remarkably by lead nitrate while andradite not. Sodium fluosilicate was found to be an effective selective depressor for andradite. Zeta potential measurements and Infrared spectrum measurements indicate chemisorption and physically absorption are occured on the surface of rutile with OHA and stable pentabasic chelate are formed.
	TO cite this article:WANG Jun,LIU Bei,CHENG hongwei, et al. Flotation seperation of low grade and complex rutile ore in Zaoyang and interaction of rutile with octyl hydroxamic acid[OL].[19 March 2015] http://en.paper.edu.cn/en_releasepaper/content/4634162


	2. The Research on Teeth Invade Bottomhole Rock Basing on Unified Strength Theory
	LI Wei,YAN Tie,Li Siqi
	Mine Engineering and Technology 18 March 2013
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	Abstract:Considering the condition of the bottom hole pressure, basing on unified strength theory to analyze the mechanical process of teeth invade rock, build bottomhole rock intrusive equation with unified strength parameters and give intrusive coefficient without the impact of axial load, invasion depth and bit angle. The equation considers the impacts of intermediate stress on intrusive coefficient. The results of the equation and Mohr-Coulomb strength theory are identical when b equals to 0. Analyze the impact of angle of internal friction, fluid column pressure, pore pressure and bit angle on intrusive coefficient. The results show that with b, angle of internal friction and bit angle, fluid column pressure and pore pressure increasing, the intrusive coefficient increases, increases exponentially, increases linearly and decreases linearly respectively.
	TO cite this article:LI Wei,YAN Tie,Li Siqi. The Research on Teeth Invade Bottomhole Rock Basing on Unified Strength Theory[OL].[18 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4528766


	3. The Research on Smart Drill-in Fluid Design
	Li Zhiyong,Jiang Guancheng,Xie Shuixiang,He Nengju
	Mine Engineering and Technology 02 July 2010
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	Abstract:There are continuous high concerns on formation protection technology in international petroleum engineering field. The reservoir drill-in fluid (RDF) is the first non-native fluid to contact formation, and which influences directly the ultimate capacity of oil and gas well. The paper discusses the smart RDF design method based on conventional drilling fluid. The designed RDF system is characterized as good formation damage control, as well as the performance easily adjusted for field application. The technology combines ideal packing technology with active calcium carbonate to obtain low permeability filter cake, high return permeability and low initial flowing pressure. The sized calcium carbonates contribute to develop sealing zone for preventing filtrate and solids from invading into formation, and the organophilic passageway in filter cake (the active calcium carbonate) is favorable to open automatically passageway for oil and gas during production. Different modifiers used to ground calcium carbonate surface modification are evaluated in laboratory. And the laboratory results show modified calcium carbonates are comfortable with conventional drilling fluids additives such as XC(Xanthan ), potassium polyacrylate(K-PAM), sodium carboxymethyl cellulose(Na-CMC).
	TO cite this article:Li Zhiyong,Jiang Guancheng,Xie Shuixiang, et al. The Research on Smart Drill-in Fluid Design[OL].[ 2 July 2010] http://en.paper.edu.cn/en_releasepaper/content/4377817


	4. Numerical simulation of coal seam joints and stiffness effects on coal bumps
	Jiang Yaodong,Zhao Yixin,Zhu Jie
	Mine Engineering and Technology 23 March 2006
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	Abstract:The numerical approach to translatory coal bumps analysis is used to examine the effects of joint and coal seam stiffness on the outburst velocity, deformation magnitude of the opening wall and plastic zone length in the coal seam. A series of tests are performed by varying the joint dip angles, spacing normal to joint tracks, joint block size and coal seam stiffness ratio to the surrounding rock. Results of joint and coal seam stiffness effects analysis indicate that joint dip angle, interval spacing, block size and coal seam stiffness ratio have profound influences on coal bumps. The increasing of interval spacing and joint block size can generate larger roadway deformation, lower roadway deformation velocity and longer plastic region in the coal seam. Higher stiffness ratio can also result in larger deformation, higher deformation velocity of opening wall. Coal bumps conditions deteriorate as the dip angle rotated to 90 degree or the elastic zones disappear in the whole active zone of coal seam for different spacing distributions.
	TO cite this article:Jiang Yaodong,Zhao Yixin,Zhu Jie . Numerical simulation of coal seam joints and stiffness effects on coal bumps[OL].[23 March 2006] http://en.paper.edu.cn/en_releasepaper/content/5876


	5. Reliability Analysis of Production System of Fully-Mechanized Face Based on Output Statistic
	Cai Qingxiang,Li Nailiang
	Mine Engineering and Technology 29 November 2005
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	Abstract:Production system of fully-mechanized face is a complicated system composed of human, machine and environment, meantime influenced by various random factors. Analyzing the reliability of system needs plentiful data by means of system faults statistic. Based on the viewpoint that shift output of fully-mechanized face is the result of various random factors’ synthetic influence, the process of how to analyze its reliability was deduced by using probability theory, symbolic statistics theory and systematic reliability theory combined with the concrete case study in this paper. And it has been proved that this method is feasible and valuable.
	TO cite this article:Cai Qingxiang,Li Nailiang. Reliability Analysis of Production System of Fully-Mechanized Face Based on Output Statistic[OL].[29 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3829

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