钢铁钒钛

SECONDARY COOLING TECHNOLOGY OF HIGH EFFICIENT SLAB CONTINUOUS CASTING MACHINE

Zhao Kewen, Zhao Daiqiong, Wu Bing, Chen Yong, Li Maolin, Zhang Daming

1999, 20(2): 1-6.

Abstract(19) PDF(1)

Abstract:
On the basis of the related basic investigation on secondary cooling technology of high efficient slab continuous casting, the casting speed of 1.8m/min is realized by the optimization of secondary cooling water schedule, which meet the need of improvement on slab quality and extension of steel grade cast.

INVESTIGATION OF COOLING ABILITY FOR PANGANG CONTINUOUS CASTING MOULD

Wu Bing, Chen Yong, Zhao Kewen, Wang Dijun, Li Maolin

1999, 20(2): 7-11.

Abstract(28) PDF(1)

Abstract:
Variations in the solidification coefficient of molten steel with in mold were investigated by means of measuring the solidified shell thickness of molten steel in mold-The comprehensive cooling ability for the existing continuous casting mold is reviewed in combination with dissectional test on solidified shell in molten steel leakage, which provides an important basis for high speed continuous casting of slabs.

MOLTEN STEEL TEMPERATURE CONTROL DURING HIGH SPEED CONTINUOUS CASTING

Yao Qiuyang, Chen Yong, Huang Daoxin

1999, 20(2): 12-16.

Abstract(33) PDF(1)

Abstract:
Improved molten steel temperature control at high casting speed of 1.8 m/min for Pangang casteris introduced.A lot of measures such as ladle insulation, preheating ladle, heating molten steel in LF and molten steel temperature adjustment with slab scrap, tundish insulation, used for controlling temperature drop are adopted.Tapping temperature of molten steel is decreased by 10~15℃ in comparison with conventional one.A satisfied result with ≤ 25℃ overheating degree of molten steel in tundish is achieved.

IMPROVEMENT OF CONCENTRATE GRADE OF VANADIC TITANOMAGNETITE AND ITS EFFECTON OPERATION OF BLAST FURNACE

Zhang Jianshu, Feng Chengjian

1999, 20(2): 17-23,36.

Abstract(23) PDF(1)

Abstract:
Experimental results of improvement of Panzhihua vanadic titanomagnetite concentrate grade and reduction of TiO₂ grade indicate that the concentrate grade of vanadic titanomagnetite can be increased to over 55% TFe, while TiO₂ grade is only increased by 0.16% and total amount of TiO₂ into blast furnace is decreased by 7% through demagnetization-regrinding-magnetic separation for the existing Panzhihua vanadic titanomagnetite concentrate.Under the conditions of TiO₂ content < 25% in blast furnace slag sinter grade can be increased to 49% with ore matching by means of calculation, which has some outstanding effects on the reduction of slag volume, the improvement of blast furnace productivity and the reduction of coke rate.

APPLICATION OF ARGON BLOWING TECHNIQUE WITH TUNDISH STOPPER

Zeng Jianhua, Li Zhongchao, Chen Tianming, Zhang Guocai, Li Maolin, Huang Jihong, Li Guangzheng, Wang Dijun

1999, 20(2): 24-29.

Abstract(13) PDF(1)

Abstract:
The main reasons for nozzle blocking are analyzed through an investigation of plugged nozzle and morphology of accretion. The nozzle is prevented from blocking by means of argon blowing technique with tundish stopper.Industrial experiments show that the technology not only can efficiently prevent the nozzle blocking and increase the numbers of continuous casting heats of low carbon aluminium-killed steel, but also improve steel cleanliness.

LONG LIFE TECHNOLOGY FOR STEEL TAPPING HOLEIN CONVERTER

Wang Jian, Ge Wensun, Chen Yu, Xiong Kaiwei, Yang Senxiang, Peng Tao, Wang Bo

1999, 20(2): 30-36.

Abstract(27) PDF(1)

Abstract:
The results of integral change of steel tapping hole, extending service life of it, stably tapping time and tapping temperature drop, reduction of slag carring over and increase of alloy recovery are achieved by the establishment of long life technology of tapping hole in 120 ton converter at Pangang and the application of boring technique.It is of particular advantage to reduce labor strength, stabilize technological operation and improve steel quality.

REASONS AND COUNTER MEASURES FOR APV LOSS AFTER VANADIUM PRECIPITATION

Wang Jinchao, Zeng Zhiyong, Li Guisheng, Li Qianwen, Wang Xiaojiang

1999, 20(2): 37-41,56.

Abstract(16) PDF(1)

Abstract:
The solubility of ammonium polyvanadate (APV) in various solvents is investigated according as the large loss of vanadium under the production of it in precipitation section at vanadium pentoxide shop.Resolution loss of APV issolved once and for all and vanadium recovery in precipitation section is increase with the improved technology.

LINING REPAIR PRACTICE INPANGANG NO.1 BLAST FURNACE

Sun Xiwen, Fan Yundong, Li Pingwei, Chen Mingquan, Zhang Shankun, Diao Risheng

1999, 20(2): 42-45.

Abstract(24) PDF(1)

Abstract:
The upper shaft lining of No. 1 blast furnace for smelting high TiO₂ bearing vanadic titanomagnetite is repaired by forcing and gunning methods. The results show that the gas flow distribution, the gas utilization and the economic index of blast furnace were improved after lining repair. Lining repaired by forcing process has the poor homogeneity and short service life in comparison with that by gunning process.

DEVELOPMENTS OF QUALITY STEEL SUSED FOR MOTOR VEHICLES AT PANGANG

Tang Li, Wang Ruiquan, Zhao Anyin

1999, 20(2): 46-51.

Abstract(21) PDF(1)

Abstract:
The technological process and the properties of 20CrMnTi, 40MnB, 60Si2Mn, and 55SiMnVB steels smelted in Pangang 120 ton converter are described. The problem of control of chemical compositions of steels is solved through the technical measures of ladle refining, i.e. calciumbase Pre-doxidizer addition, aluminium wire feeding and complex cored wire feeding into molten steel in ladle before steel tapping and the technical improvement of Fe-Cr alloying process.As aresult, the required harden ability and cleanness of steels are ensured.The 20CrMnTi, 40MnB, 60Si2Mn, steels are perfectly suitable to use in automobile industry.

STRAND SURFACE TEMPERATURE MEASUREMENT IN SECONDARY COOLING ZONES OF CASTER

Chen Yong, Wu Bing, Zhao Kewen, Li Maolin, Wang Dijun

1999, 20(2): 52-56.

Abstract(29) PDF(1)

Abstract:
Technological features of CIT-M infrared-radiation temperature measuring system are described. The strand surface temperatures of typical steel grade cast at various casting speeds are measured by use of it. The effect of the withdrawing speed and the cooling intensity on the strand surface temperature is discussed. The results obtainted form an important basis for the optimization of water distribution in secondary cooling zones at Pangang slab continuous caster.

MEASURES FOR REDUCTION OF COKE RATE OF BF IRONMAKING AT PANGANG

Zhong Yong, Zhao Daiqiong, Jiang Sheng

1999, 20(2): 57-62.

Abstract(19) PDF(1)

Abstract:
Coke saving measuresin the recent, years at Pangang are summarized according to various ways of beneficiated materials, high blast temperature, oxygen-enriched blast, pulverized coal injection rate and improvement of blast furnace operation, The effect of related smelting factors on coke rate is investigated in combination with the production data and moreover further measures for reduction of coke rate are proposed.

ECONOMIC EVALUATION INDEX SYSTEM OF DRIFT-OREPASS TRANSPORTATION IN OPEN PIT MINE

Xie Dianchun

1999, 20(2): 63-68.

Abstract(21) PDF(1)

Abstract:
Economical principle of the drift-orepass transportation is explained and thirteen economical indexes of drift-orepass are proposed.The ways to modify these passes are demonstrated as the examples of twelve Pangang mine passes.It is considered that the increment of ore and rock transportation volume throughout passes, the extension of service life of adits and passes and the improvement of economical benefits to mining can be achieved by means of modification.

1999 Vol. 20, No. 2