·352 北京科技大学学报 2004年第4期 铁矿表面作用的ESCA分析)北京科技大学学报， 2002,245):483 Action Mechanism of Floatation Reagent BET to Coal and Pyrite HU Jun',KANG Wenze' 1)College of Resource and Environment,Heilongjiang Institute of Science and Technology,Harbin 150027,China 2)College of Chemical and Environmental Engineering,China University of Mining and Technology,Beijing 100083,China ABSTRACT The study on the effect of floatation reagent BET on coal and pyrite,which mainly concemed the respects such as surface potential,wettability,ESCA analysis and absorption measurement of coal and pyrite,rev- ealed the mechanism of BET to coal and pyrite.The separation tests of practical samples were carried out.The re- sults manifested that the floatation effect of BET is better than that of other common floatation reagents and has a higher selectivity especially in high-sulfur coal sample floatation. KEY WORDS flotation;reagent:selectivity:desulfuration 里6Y堂5堂6Ts望6望理sYa%里6Ye6望e6a6望e6望6堂est望eeo望6望6望s堂6Y6Yo堂a6堂a堂eYeo堂e堂eo7o望e2e6望6望as业s2as亚es望e6堂c6望as空a6o From Journal of University of Science and Technology Beijing,2004,11(4):289 Cut Slope Reinforcement Technique in Open-pit Mines GAO Yongtao",SUN Jianbo,WU Shunchuan",JIN Aibing" 1)Civil and Environmental Engineering School,University of Science and Technology Beijing,Beijing 100083,China 2)Highway Development Limited Company of Henan Province,Zhengzhou 450052,China ABSTRACT The design and practice in supporting the cut slope of an open-pit mine were introduced,in which the high pressure grouting method was used in reinforcing the weak formation in the slopes.Based on a detailed ge- ological survey of the slope,a theoretical analysis was carried out,and the design parameters were proposed,where the Tresca or Mohr-Coulomb yield criteria was employed.A patent technology,named"Technology of high pres- sure and multiple grouting in different levels within a single hole",was employed in the construction.Anchor bars were also installed as grouting proceeds.This method combines anchoring and grouting comprehensively and was found successful in practice. KEY WORDS mining engineering,open-pit slope;weak formation;supporting;high pressure grouting犯 北 京 科 技 大 学 学 报 年 第 期 铁 矿 表 面作 用 的 分 析 北京科技 大 学 学 报 ， ， ‘ 》 ， 犬刀万 环仓 ‘ ， ’ 七 周 批 抽 ， ， 业 钊 爵 吨 ， 澎勿 ， ， 山 ， ， 口 ， 耐 幻 们 佃 田补 。 鱿 肠赞肠货药协 印 ” ， ， 夕 一 刀 ， 乙 刀， 砰 ， 刀 衅 ， 们 ， ， ， ， ， ， 厅 ， 以 ， 一 ， ’‘ 月贻 而 ，，， 城 扔助 ， 一 吧