钢铁钒钛

FACTORS INFLUENCING HIGH TEMPERATURE THERMOPLASTICITY OF LOW ALLOY VANADIUM STEEL AT TEMPERATURES RANGING FROM 600 TO 1200℃

XIAO Feng, XU Chushao, ZHAO Kewen, WU Bin

1998, 19(2): 1-5.

Abstract(20) PDF(1)

Abstract:
The effect of four factors. i. e. vanadium content in steel,deformation temperature,deformation rate,cooling rate,on high temperature thermoplasticity of low alloy vanadium steel was quantitatively investigated on GLEEBLE-1500 thermal-mechanical simulator by means of orthogonal design test. A mathmatical models describing the relation between four factors and thermoplasticity of steel have been developed by the use of mathmatical regression method,which will provide an important basis for making reasonable vanadium steel continuous casting technology.

APPLICATION OF FOAMING AGENT IN MOLTEN LF SLAG

YANG Jian, LI Zhongchao, LI Yangzhou, ZHANG Xiaoling, LI Maolin, SONG Guoju, CHEN Shuyuan, YAN Guangting, TANG Ping

1998, 19(2): 6-8.

Abstract(18) PDF(1)

Abstract:
The tests of submerged arc heating in foamy slag were conducted by the use of the carbonate foaming agent in 120t ladle furnace. The test results show the foaming property of the foaming agent can meet the requirements of submerged arc heating process in foamy slag,When 120kg foaming agent is added,the relative foaming height of the molten slag is about 100%,the foaming of molten slag continue over 8 min. The average temperature rise rate of molten steel by means of submerged arc heating in foamy slag is increased by 18. 6 % when the heating time is 11~15min.

STUDY OF SALT SYSTEM COMPONENTS FOR PANZHIHUA TITANIUM BEARING SLAG FUSED SALT CHLORINATION

CHENG Guorong

1998, 19(2): 9-12,19.

Abstract(18) PDF(2)

Abstract:
Based on the mechanism of fused salt chlorination and the features of Panzhihua titanium bearing slag,the process conditions and components of salt system were systematically investigated in industrial test of fused salt chlorination. The feasibility to use self-forming salt system was discussed. The potassium and sodium salts are not consumed with self-forming salt system,which is beneficial to comprehensively utilize magnesium in Panzhihua titanium bearing slag.

DEVELOPMENT OF HIGH PURITY ULTRAFINE TiO₂ POWDER BY TiCl₄ HYDROLYSIS

HU Hongfei, XI Gan, XU Shulin, HUANG Shouhua, LI Dacheng, QUAN Xuejun

1998, 19(2): 13-19.

Abstract(26) PDF(2)

Abstract:
The process for preparation of high purity ultrafine TiO₂ powder by means of neutralization of hydrolyzed TiCl₄ solution with ammonia in the presence of organic dispersant was developed. The effects of the dispersant type and its consumption, concentration of reactants, feeding mode,maturing temperature and time on the properties of TiO₂ were investigated.The spheroidal TiO₂ powder was prepared whose purity is over 99.5%,particle diameter is less than 1.0μ,The results of 100kg grade test show the physicochemical properties of the ultrafine TiO₂ powder and the characteristics of PTC electronic component made from the TiO₂ powder approach the technical index of similar products of TDK Co. in Japan.

VANADIUM DISTRIBUTlON IN VANADIUM RECOVERY PROCESS FROM HOT METAL IN CONVERTER AT PANGANG

YANG Subo, GE Wensun, WANG Jian, YE Xiangfei, LI Gangwei, CHEN Wanli

1998, 19(2): 20-23,27.

Abstract(13) PDF(2)

Abstract:
The vanadium distribution in vanadium recovery process from hot metal in converter at Pangang was investigated. Based on test results, vanadium balance was obtained. The technical measures to increase vanadium ratio in vanadium recovery from hot metal in converter were put forward.

IMPROVED SKIMMING TECHNOLOGY FOR DESULPHURIZED HOT METAL AT PANGANG

YIN Xijun, CHEN Ronggui, JIANG Guoxing, CHEN Wanli

1998, 19(2): 24-27.

Abstract(22) PDF(1)

Abstract:
Based on the actual state of hot metal and pretreatment processess at pangang.the measures are proposed to improve skimming method through a series of experiments,The experimental results show the use of two in one brick for skimming is feasible. The skimming efficiency and flow rate of hot metal are 97.6% and 14. 9t/min respectively so as to meet the reguirements of vanadium recovery from hot metal. The content of calcium oxide in vanadium slag decreases to 1.28%.

APPLICATION OF STRIP PROFILE CONTROL

WANG Dan, SHEN Xiuping, PENG Huifeng, YANG Mingjie

1998, 19(2): 28-34,42.

Abstract(18) PDF(1)

Abstract:
Based on profile equation,shape cone and roll gap equation for strip rolling,the profile control requirements and control ideas were analyzed. The technical issues with regard to selection of the mode of profile control were considered. In addition,Profile index of hot rolled transfer bar and material used for cold rolling and optimization of load distribution under conventional hot rolling condition were quantitatively analyzed.

RECOVERY METHODS OF COBALT FROM COBALT PYRITE CONCENTRATE AND TECHNICAL AND ECONOMIC ANALYSIS

YANG Baoxiang, PENG Yi, ZHOU Youquan, ZHU Jun

1998, 19(2): 35-38.

Abstract(19) PDF(2)

Abstract:
The recovery methods of cobalt from cobalt pyrite concentrate at home and abroad were introduced. Based on previous experimental results,the proposal is made for selection of recovery method of cobalt from Panzhihua cobalt pyrite concentrate and technical and economic index.

ANALYSIS OF FERROTITANIUM SMELTING PROCESS USING PANZHIHUA TITANIUM CONCENTRATE

YANG Yangjun, SUN Chaohui, ZHANG Fan

1998, 19(2): 39-42.

Abstract(16) PDF(2)

Abstract:
Based on the features of Panzhihua titanium concentrate,the reasons why titanium recovery is low and aluminum consumption is high when ferrotitanium is smelted in alumino-thermic process were analyzed. The measures to solve those problems are put forward.

CONTROLLING NETWORK SYSTEM FOR COLD TANDEM MILL AT PANGANG

ZHANG Zhongyuan, JIANG Jianjun, LIU Ji

1998, 19(2): 43-46.

Abstract(26) PDF(1)

Abstract:
The function distribution,network structure,network configuration and network interconnection of two-level computer network system for cold tandem mill at Pangang are introduced. The features of hierarchical and distributed controlling system are described, which is of great importance to control system design in future.

PRESENT STATE OF DEVELOPMENT AND RESEARCH OF ULTRA-FINE TITANIUM OXIDE

DUAN Minghua, JIANG Zhigang, XIE Bing

1998, 19(2): 47-51,58.

Abstract(39) PDF(3)

Abstract:
The properties, uses and manufacturing processes of ultra-fine titanium oxide are described. The current situation of production and research of ultra-fine titanium oxide at home and abroad is introduced.

CHEMICAL PHASE ANALYSIS FOR CALCIUM COMPOUNDS IN COMBINED DESULPHURIZING AGENT

HE Zhiming

1998, 19(2): 52-58.

Abstract(20) PDF(1)

Abstract:
The acetylene produced in reaction of the sample of combined desulphurizing agent to water is burned in oxygen gas. The amount of CO₂ formed is determined in soda asbestos absorption gravimetric method so as to calculate CaC₂ content. The free CaO and CaC₂ in the sample are leached in glycerol-glycol-sucrose-water mixed leaching liquor. The total amount of Cao and CaC₂ is determined in EGTA complexometric titration at pH> 12. The amount of CaC₂ subtracted from the total amount of CaC₂ and CaO leaves the amount of free CaO. The CaCO₃ in residue after leaching is leached in acetic acid. The calcium acetate is determined in EGTA complexometric titration so as to calculate CaCO₃ content. The CaF₂ in the final residue leached in sulphuric acid chlorhydric acid-boracic acid-water is analyzed.

A. Itman, K. R. Cardoso, H. J. Kestenbach

1998, 19(2): 59-62.

Abstract(17) PDF(2)

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Chiang Mingsiang

1998, 19(2): 62-62.

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Lee Sang Woo

1998, 19(2): 63-64.

Abstract(18) PDF(1)

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Mark S Fenton

1998, 19(2): 65-66.

Abstract(16) PDF(1)

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S·K·Saxena

1998, 19(2): 67-70,64.

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1998 Vol. 19, No. 2