Sponsored by: EPD Pyrometallurgy Committee
Program Organizer: Jerome P. Downey, Hazen Research, Inc., Golden, CO 80403; Ed Mounsey, Ausmelt Limited, 2/13 Kitchen Road, Dandenong, Victoria 3175 Australia
Thursday, AM Room: A16-17
February 8, 1996 Location: Anaheim Convention Center
Session Chairmen: L. G. Twidwell, Professor, Montana College of Mineral Science & Technology, Department of Metallurgy, Butte, MT 59701; Osamu Ishikawa, Bechtel Corporation, 50 Beale Street, San Francisco, CA 94119-3965
8:30 am
MANGANESE BEHAVIOR AT MINIMAL SLAG OPERATION IN A COMBINED BLOWING CONVERTER: Ikuhiro Sumi, Tomoo Isawa, Toshio Takaoka, Materials and Processing Research Center, NKK, 1 Kokan-Cho, Fukuyama, 721 Japan
A new steel making process, in which manganese ore was intentionally reduced, was developed to achieve a higher manganese yield using a combined blowing converter. In this study, manganese behavior was discussed through the introduction of a model. The model consists of two terms; one represents reduction rate of manganese ore and the other represents oxidizing rate of manganese by oxygen supply from top lance. Apparent reduction rates of manganese were calculated by the two terms. These terms were determined experimentally, with 50 kg and 250 ton combined blowing converters. The model calculated manganese changes in a short duration and the integration of these changes gave an estimation of total manganese content change for the operation. We applied the model to the actual operation and found that manganese behavior was predicted fairly well by this model.
8:55 am
MELTING BEHAVIOR OF SILICA FLUX IN THE COPPER CONVERTER: GUO Xian Jian, DING Wei An, Beijing General Research Institute for Nonferrous Metals, Beijing, 100088, China; James L. Hendrix, University of Nevada, Reno, Mackay School of Mines, Reno, Nevada
In this paper, the effects of matte grade, flux grain size, blast flowrate and blast O2 content on the melting process of silica flux in a copper converter were investigated. The results showed that the blast flowrate and the blast O2 content were not significant factors in the melting process. However, with an increase in grain size of flux and grade of matte, the amount of the flux molten decreased. The data on the rate of the melting process correspond well with the mathematical model used which simulates the chemical reactions occurring at the interface. The kinetic equations of melting are as follows: X = 1 - (1 - 0.0206t/ro)3 (matte grade = 69.57% Cu); X = 1 - (1 - 0.0169t/ro)3 (matte grade = 74.95% Cu); X = melted fraction, t = time, ro = initial radius of grain.
9:45 am BREAK
10:15 am
CURRENT OPERATIONS IN SMM'S SLIME TREATMENT: C. Segawa, T. Kusakabe, Niihama Copper Refinery, Sumitomo Metal Mining Co. Ltd., Niihama, Ehime - 792, Japan
SMM operates an original slime treatment process for recovering precious metals and other metals (Te, Se, Sb, Bi) from the copper and the lead anode tankhouse slimes. In recent years, the amount of slimes had increased and the pyrometallurgical processing units capacity became the bottleneck of the entire plants. For the expansion of the plant, new pyrometallurgical facilities, incorporating a BBOC, was commissioned in 1992 and has now been successfully operated. In addition, unit operations were optimized to increase recovery and reduce operating cost. The results of modifications made in the plant are discussed in this paper.
10:40 am
V-Al ALLOYS BY ALUMINOTHERMIC REDUCTION OF V2O5: Carlos A. Nunes, Univ. of Wisconsin - Madison, 1500 Eng. Drive, Madison, WI 53706 and Hugo R. Z. Sandim, FAENQUIL - DEMAR, Polo Urbo-Industrial s/no, 12600-00, Lorena, SP, Brazil
V-Al alloys have been used commercially for the production of pure vanadium by
Electron Beam Melting (EBM), as well as for the obtainment of Ti-based alloys
(ex. Ti-6Al-4V). The aluminothermic reduction of the vanadium pentoxide (V2O5)
is the primary method to obtain these alloys. Concerning the obtention of pure
vanadium, some results in the literature have indicated a V-15 wt% Al alloy as
the suitable alloy for direct EBM. We have studied the aluminothermic reduction
of V2O5 in order to define operational parameters which might lead to V-Al
alloys presenting composition close to 15 wt% Al. In this work, we present
results on the effect of Al excess, CaO addition and reaction atmosphere (air,
argon) on the alloy composition (Al, O, N) and metallic yield. In one of the
experiments carried out in argon and using 30% excess Al, we obtained an alloy
presenting the following composition: 13.5 wt% Al; 2,018 wt ppm O, and 40 wt
ppm N. The vanadium yield in this specific case was 93%. Results on
microstructural analysis of selected alloys by SEM (BSE images) and EPMA (WDX)
will also be presented.
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