Electric furnace matte tap hole developments at Falconbridge Limited

Abstract
Planned increases in electric furnace productivity and higher matte temperatures needed for the Sudbury Smelter's SO2 Abatement Plan, require an improved matte tap hole. Since startup in 1978, the matte tap holes have been incrementally improved by the addition of copper cooling blocks around the refractory tap blocks. These improvements provided a tap block life of about 100 taps per campaign.
In July 1993, a prototype matte taphole was installed in Number 2 Electric Furnace to develop the technology to increase tap hole service life. The design was based on a heat transfer model of the tapping process to determine candidate refractory materials and cooler arrangements. The prototype tap hole features increased copper cooling, high conductivity refractories and extensive instrumentation. Eight trial campaigns are reviewed outlining the performance of silicon carbide and graphite refractories and typical heat loads during tapping.
Keywords: Smelters, Falconbridge, Tap hole developments, Matte tap holes.
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Summary: Most electric furnaces in the nickel and copper smelting industries are still fitted with conventional electrode holders which consist of water-cooled electrical contact clamps and a pressure ring. The water cooling exerts a significant cooling effect on the electrode column. The importance of controlling the temperature of the Soderberg electrode paste at the contact clamp area is examined, using in-plant experience and computer simulation of the paste melting and baking process. In addition...
Publication: CIM Bulletin
Author(s): R.J. Ord, J.G. Schofield, C.G. Tan
Keywords: Smelter operation, Soderberg electrodes, Electrode paste, Paste, Freeboard temperatures
Issue: 991
Volume: 88
Year: 1995
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Summary: Operations started at BCL in December 1973, and the smelter is currently in the seventh year of its fifth campaign. The next major shutdown is scheduled for 1995. During the current campaign, a number of major on-line refurbishments have been carried out without any significant disruption to production. These include the complete rebuild of both drying plant electrostatic precipitators, the installation of a new electrostatic precipitator at the flash furnace, the conversion to a distributed...
Publication: CIM Bulletin
Author(s): R.A. Hall, G.A. Highcock
Keywords: Smelter operation, Nickel mining, Copper mining, Metallurgy.
Issue: 991
Volume: 88
Year: 1995
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