A quantitative method for silica flux evaluation |
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Authors: | R H Schonewille G J O'Connell J M Toguri |
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Affiliation: | (1) Department of Metallurgy and Materials Science, University of Toronto, M5S 1A4 Toronto, ON, Canada |
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Abstract: | In the smelting of copper and copper/nickel concentrates, the role of silica flux is to aid in the removal of iron by forming
a slag phase. Alternatively, the role of flux may be regarded as a means of controlling the formation of magnetite, which
can severely hinder the operation of a furnace. To adequately control the magnetite level, the flux must react rapidly with
all of the FeO within the bath. In the present study, a rapid method for silica flux evaluation that can be used directly
in the smelter has been developed. Samples of flux are mixed with iron sulfide and magnetite and then smelted at a temperature
of 1250 °C. Argon was swept over the reaction mixture and analyzed continuously for sulfur dioxide. The sulfur dioxide concentration
with time was found to contain two peaks, the first one being independent of the flux content of the sample. A flux quality
parameter has been defined as the height-to-time ratio of the second peak. The value of this parameter for pure silica is
5100 ppm/min. The effects of silica content, silica particle size, and silicate mineralogy were investigated. It was found
that a limiting flux quality is achieved for particle sizes less than 0.1 mm in diameter and that fluxes containing feldspar
are generally of a poorer quality. The relative importance of free silica and melting point was also studied using synthetic
flux mixtures, with free silica displaying the strongest effect. |
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