Sponsored by: EPD Process Mineralogy Committee
Program Organizer: Dr. W. Petruk, CANMET, Natural Resources Canada, 555 Booth St., Ottawa, Ontario, Canada K1A 0G1
Tuesday, PM Room: A14-15
February 6, 1996 Location: Anaheim Convention Center
Session Chairperson: Richard D. Hagni, Department Geology and Geophysics, 125 McNutt Hall, Univ. Missouri-Rolla, Rolla, MO 65401
PROCESS MINERALOGY OF REACTION PRODUCTS BETWEEN NICKEL CONCENTRATE AND Fe- Mg SILCATE SLAGS: Richard D. Hagni, Department Geology and Geophysics, 125 McNutt Hall, University of Missouri- Rolla, Rolla, MO 65401; Maria K. Kojo, H.Y. Sohn, Department Metallurgy and Metallurgical Engineering, 412 Wm. C. Browning Bldg, University of Utah, Salt Lake City, UT 84112
Pelletized nickel sulfide concentrates submerged into Mg- Fe silicate slags were studied by ore microscopy and electron microprobe to characterize the mineralogy of the reactions. The original concentrate, which consisted of pyrrhotite, pentlandite, pyrite, chalcopyrite, and violarite, formed a matte with original sulfide particle outlines rounded to obliterated, and recrystallized into two phases: pentlandite, Fe0.58Ni0.51Cu0.03S and pyrrhotite, Fe0.75Ni0.18Cu0.01S solid solutions. Those portions of the sulfide pellets that sloughed off into the slag were melted to form liquid spheres of pentlandite and pyhrrhotite. Reaction with the slag resulted in the formation of magnetite in the pyrrhotite portions of the sulfide spheres. The slag consisted of ferrohypersthene, Mg- Al- Fe spinel, and glass.
MINERALOGICAL CHARACTERIZATION OF ZINC RETORT RESIDUES OF THE MISSOURI-OKLAHOMA-KANSAS TRI-STATE REGION: Dhiren K. Panda, David G.C. Robertson, Generic Mineral Technology Center for Pyrometallurgy, 215 Fulton Hall, University of Missouri-Rolla, Rolla, MO 65401
The zinc retort residues from old pyrometallurgical sites (in the Oklahoma-Kansas-Missouri tri-state area) pose an environmental problem, since they contain a significant amount of lead and zinc, among other contaminants. The residue is being treated by the SCIBS (Submerged Combustion in-bath Smelting) process at the University of Missouri-Rolla. Results of the mineralogical characterization of the residue and the resulting slag are presented in this paper.
SLURRY PUMP PARTS DRILLED AND TAPPED WITH HARDNESS IN EXCESS OF 700HBN: George A. Calbornanu, A.R. Wilfley & Sons, Denver, CO
In order to overcome drilling and tapping of high hardness wear resistent material in slurry pumps, most mild steel inserts are mounted in the mold and after pouring become an integrated part of the casting. This process limits the design possibilities of slurry pumps and efforts are made to drill and tap the hard iron itself. The paper will present practical results obtained in drilling and tapping a wear resistent material with hardness in excess of 700HBN. The life time of the slurry part pumps in service increased 2.5 times.
3:30 pm BREAK
MINERALOGICAL CHARACTERIZATION AND SUPERFICIAL PRETREATMENT OF XENOTIME AND ZIRCON FROM THE PITINGA MINE (AMAZON, BRAZIL): M.L. Torem, I.B. Scorzelli, L.C. Bertolino, Department of Material Science and Metallurgy, Catholic University of Rio de Janeiro - Rua Marques de São Vicente 225, 22453 900 Rio de Janeiro, Brazil
Significant amounts of a middling xenotime - YPO4 (90%) and zircon ZrSiO4 (10%) are produced by the flowsheet of Taboca Mining, one of the largest world tin concentrate producers. Due to the lack of information about the complexity of the xenotime and zircon no successful separation process of the middling has been put forward until now. Detailed characterization was performed on the xenotime and zircon, using optical microscopy, SEM/EDS and XRD techniques. In addition, superficial pretreatment with HCL, HNO3, HF and NaOH was done to evaluate modifications on surface composition and the morphology of the particles for flotation purposes. The studies showed that both minerals contain very small inclusions (1 to 5 um) of thorite and iron oxides, and the pretreatment showed alterations of the minerals on the particle surfaces.
CHARACTERIZATION OF PARTICLES IN AIR-BORNE DUSTS: William Petruk, CANMET, 555 Booth St., Ottawa, Ontario, Canada K1A 0G1; H.C.W. Skinner, Dept of Geology and Geophysics, Yale University, New Haven, CT 06520-8109
Airborne dusts contain particles that are up to 35 um in size and have aspect ratios that range from 1 to >10. The mean size and mean aspect ratio is about 3.5 um and 2.7 respectively. The particles are composed of a wide variety of minerals including tremolite, talc, serpentine, hypersthene, kaolinite, dolomite, calcite, quartz, etc. A method of quickly identifying the minerals and determining quantities, grain sizes, and aspect ratios was developed by using an Kontron image analyzer interfaced with a Jeol microprobe and Tracor Northern EDS. The mineral in each particle is identified automatically by scanning with an X-ray beam and correlating the X-ray signal to signals from mineral standards. Grain sizes and aspect ratios are measured with the image analyzer.
MINERALOGY APPLICATION TO METALLURGICAL WASTES DISPOSAL AS BINDING MATERIALS: Dr. Professor V.A. Mymrin, Scientific Centre for Engineering Geology and the Environment, Russian Academy of Sciences, P.O. Box 145, Ulanski per. 13, Moscow 101000, Russia
This paper is devoted to the role of all types of ferrous minerals (iron,
steel and casting) and some kinds of nonferrous dump slags in combination with
liquid or sludge wastes as binding materials. These materials are used for
binding other industrial wastes (incinerator's and heat power station ash and
slag, burnt coal mining refuses and burnt foundry sands, etc). These New
materials work like poor concrete and, in comparison with natural traditional
inert materials (sand, gravel, broken rock, etc), have numerous advantages in
strength, elasticity, construction rate, long service, cost-price, environment
protection, etc. All the hazardous elements of wastes are chemically bonded in
nonsoluble compositions and were tested in acid, alkaline and neutral
solutions. Ten roads and one airfield were constructed in rigorous climate
conditions, including the Russian North and Siberia and during 17 years of
exploitation they show high performance.
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