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.792. 北京科技大学学报 第29卷 Refining process analysis of clean pipe steel LIU Jianhua,BAO Yanping,LI Taiquan,HAN Lina,DONG Xian,YANG Lingli Metallurgical and Ecological Engineering School.University of Science and Technology Beijing.Beijing 100083.China ABSTRACT Serious sampling and integrated analysis were carried out in the production of pipe steel with LF- VD.RH LF and LF-RH refining processes.It is shown that high grade pipe steel can be produced with the three refining processes,but the purity and cleanness of the steel produced with LF-RH process are higher:the functions of different refining instruments are distinct,but they are affected effected by up and dow n working procedures because of the conjunction and restriction of the quantity and composition of refining slag and other factors. KEY WORDS pipe steel;refining:purity;cleanliness (上接第765页) An algorithm of disappearing figure based on 3D visualization of ore deposit SU Haiyun,LI Zhongxue Key Laboratory of Chinese Ministry of Education for High-Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing Beijing 100083,China ABSTRACI A painter algorithm was proposed to better solve the disappearing problem of ore body when ore body was displayed in a graphics equipment.After taking four steps of merging plane polygon,decomposing polygon graphics into triangle graphics,sorting triangular surface treatment and building up triangle graphics for depth,ore body was disposed by the painter algorithm,and hidden line or body warded off by opaque body or other entities in original entities would be not output.When ore body was showed and printed by the graphics e- quipment,underground mining engineering body would be more realistic. KEY WORDS underground mining engineering:disappearing figure:painter algorithm;3D visualizationRefining process analysis of clean pipe steel LIU JianhuaBAO Y anpingLI T aiquanHA N L inaDONG XianY A NG L ingli Metallurgical and Ecological Engineering SchoolUniversity of Science and Technology BeijingBeijing100083China ABSTRACT Serious sampling and integrated analysis were carried out in the production of pipe steel with LF－ VDRH－LF and LF－RH refining processes．It is shown that high grade pipe steel can be produced with the three refining processesbut the purity and cleanness of the steel produced with LF－RH process are higher；the functions of different refining instruments are distinctbut they are affected effected by up and down working procedures because of the conjunction and restriction of the quantity and composition of refining slag and other factors． KEY WORDS pipe steel；refining；purity；cleanliness （上接第765页） An algorithm of disappearing figure based on3D visualization of ore deposit SU HaiyunLI Zhongxue Key Laboratory of Chinese Ministry of Education for High-Efficient Mining and Safety of Metal MinesUniversity of Science and Technology Beijing Beijing100083China ABSTRACT A painter algorithm was proposed to better solve the disappearing problem of ore body when ore body was displayed in a graphics equipment．After taking four steps of merging plane polygondecomposing polygon graphics into triangle graphicssorting triangular surface treatment and building up triangle graphics for depthore body was disposed by the painter algorithmand hidden line or body warded off by opaque body or other entities in original entities would be not output．When ore body was showed and printed by the graphics equipmentunderground mining engineering body would be more realistic． KEY WORDS underground mining engineering；disappearing figure；painter algorithm；3D visualization ·792· 北 京 科 技 大 学 学 报 第29卷