钢铁钒钛

INTEGRAL DECISION ON MINING BOUNDARY OF OPENCUT MINE

Xie DianChun

1996, 17(2): 1-8.

Abstract(46) PDF(0)

Abstract:
The mining boundary integral decision at the west Lanshan Mine is taken as an engineering example to introduce the procedures and methods for providing qualitative and quantitative indices for the five subordinate mining boundary decision objectives by establishing the deposit geological model, rock and earth work model, mining process model and economic appraisal model.Priority is given to the implementation of multi-objective decision based on the utility theory and utility function so as to select the optimized open mine mining boundary programme characterized by safety production,stable side slope,operational mining technology,maximized recovery of mineral resources and best economic benefits.

RESEARCH ON THE BURDEN STRUCTURE OF SMELTING THE PANZHIHUA'S VANADIUM-BEARING TITANOMAGNETITE

Ma Jiayuan, Diao Risheng

1996, 17(2): 9-14.

Abstract(34) PDF(0)

Abstract:
There exists a certain kind of difficulty to smelt the vanadium-bearing titanomagnetite in a conventional blast furnace. The overwhelming important condition to smelt such kind of the magnetite is to choose reasonable burden structure so as to control the reduction of TiO₂. The result obtained from the research works and the praetices e.g. the burden reduction in the lump zone, the smelting at high temperature, the forming of the first slag as well as the reaction of the slag with iron showed that the smelting properties of the sinter can be improved by addition of SiO₂ and adding some fluor-spar, ferriferous manganese ore or some irreducible ores.

REDUCTION KINETICS OF V₂O₅ AND VANADIUM DIFFUSION IN MOLTEN IRON DURING SMELTING V-BEARING TITANIFEROUS MAGNFTITE

Liu Qingcai, Lin Jing

1996, 17(2): 15-19.

Abstract(55) PDF(0)

Abstract:
The diffusion of vanadium in molten iron and V₂O₅ reduction kinetics are the key factors affecting V₂O₅ reduction and recovery of vanadium during smelting vanadium-bearing titaniferous magnetite. In this paper,diffusion and kinetics features of vanadium,influence of temperature and titanium in molten iron on vanadium diffusion and interaction of vanadium and titanium diffusion have been examined. Additionally,the kinetics of V₂O₅ reduction and rate controlling step to smelting V-bearing titaniferous magnetite are also investigated. It is shown that the diffusion coeffcient increases with temperature,and increasing titanium content in molten iron will promote the diffusion ability of vanadium. However,titanium diffusion decreases as vanadium concentration increases. The kinetics feature of V₂O₅ reduction is that the diffusion of vnandium in molten iron is rate controlling step.

PHYSICAL AND CHEMICAL PROPERTIES OF PRE-REDUCED PELLETS OF V-BEARING TITANIFEROUS MAGNETITE AND MOLTED SLAG AFTER THE PELLET SMELTING

Shi YuHong

1996, 17(2): 20-24.

Abstract(64) PDF(1)

Abstract:
Test results with regard to electric conductivity and viscosity of the pre-reduced pellets and molten slag are given. In the meanwhile, corresponding data are processed and the mechanism is investigated. In addition, their materialogical structures are respectively examined.

STUDY ON PHASE COMPOSITION OF THE COHESIVE DROPING ZONE IN BF DURING SMELTING V-BEARING TITANIFEROUS MAGNETITE SINTER

Song Guocai, Yuan Tianyu, Chen Xiaowu

1996, 17(2): 25-27.

Abstract(72) PDF(1)

Abstract:
The characteristic feature of the cohesive dropping zone in BF during smelting V-bearing titaniferous magnetite sinter is examined. Samples prepared from the laboratory cohesive dropping apparatus simulating the blast furnace conditions were studied and the phase composition of this zone was investigated.

EFFECT OF VANADIUM ON THE MICROSTRUCTURE AND PROPERTIES OF WHITE CAST IRON

Wang KeFei

1996, 17(2): 28-32.

Abstract(46) PDF(0)

Abstract:
The white cast iron of four different vanadium contents was treated by four heat treatment processes. The mechanical properties and wear resistance were determined. The morphology of V in white cast iron and its effect on the microstructure and properties of white cast iron were analysed.

MANUFACTURING AND APPLICATION OF SURFACE ALLOYED GUIDE

Fu Hanguang, Yang Zhijun

1996, 17(2): 33-36.

Abstract(48) PDF(0)

Abstract:
The characteristics of the surface alloying process and the demand of mill guides on the material properties are investigated. It is suggested that using surface alloying process for manufacturing mill guides is feasible.The effects of casting temperature, material constitutes and size of alloy powder on the quality of surface alloyed layer are studied. Test results show that desired surface alloyed layer is expected to be obtained provided suitable casting temperature, alloy powder size and materials are chosen. Trial production use suggests the surface alloyed guide enjoys a service life four times that of the wholy alloyed guide.

INVESTIGATION ON RECOVERY OF FINE SIZE ILMENITE

Zhou JianGuo

1996, 17(2): 37-41.

Abstract(52) PDF(1)

Abstract:
An investigation has been made into the characteristic feature of the fine size materials at the Panzhihua Titanium Concentration Plant. Production steps involving water-sealed cyclone thickening, tailings disposal by high gradient magnetic separation and floatation of sulphur and titanium compound are introduced. The process flow regarding recovery of fine size ilmenite is proposed.

A REVIEW FROM WORLD-WIDE PERSPECTIVE ON HIGH SPEED SLAB CONTINUOUS CASTING TECHNOLOGY

Zhao XingWu

1996, 17(2): 42-50.

Abstract(37) PDF(0)

Abstract:
The properties of casting powder used for high-speed slab continuous casting technologies developed by overseas steelmakers in the recent years and their effects on high speed casting are reviewed. Other principal technologies such as the vibration mode, optimized parameters for submerged nozzle,low overheat degree and minimized bulging etc are also investigated.

SECONDARY REFINING AND CONTINUOUS CASTING OF HEAVY RAIL STEEL

Shan LinTian

1996, 17(2): 51-57.

Abstract(58) PDF(1)

Abstract:
The necessity to apply vaccum degassing to heavy rail steelmaker is examined,and overseas heavy rail manufacturers using vaccum degassing are introduced. The advantage of producing heavy rails from continuous cast blooms and the characteristic feature of the continuous cast process for rail steel is briefly reviewed. Finally, measures adopted world-wide to improve the quality of continuous cast blooms are investigated and major overseas manufacturers producing heavy rails from continuous cast blooms are given.

STATE-OF-ART OF FOREIGN TITANIUM WHITE INDUSTRY

Hu KeJun

1996, 17(2): 58-65.

Abstract(51) PDF(1)

Abstract:
The state-of-the arts of sulphating and chlorinating processes,production capacity, market situation and new product developments in overseas titanium white(titania) industry are described in the article.

QUANTITATIVE ANALYSIS ON RUTILE AND ANATASE TYPE TiO₂USING X-RAY DIFFRACTION

Yi LiJun

1996, 17(2): 66-68.

Abstract(52) PDF(4)

Abstract:
The factors affecting accuracy and tolerance of quantitative analysis on rutile and anatase type TiO₂ using D/max-RC rotating anode type X-ray diffracto-meter are investigated. It is suggested that the reference specimen method should be combined with K-value method to conduct quantitative analysis on rutile and anatase type TiO₂. Under Cu-K_α radiation conditions, the diffraction peak background elimination △2θ is in the range of 0.7~1.2°,scanning rate ≤ 5°/min, the content of rutile or anatase type TiO₂ is above 15% in sample and quantitative tolerance is<5%.

1996 Vol. 17, No. 2