article · Procedia Manufacturing
Copper smelter dust collected from an electrostatic precipitator at a reverberatory furnace in Limpopo, South Africa, represents a copper-rich secondary resource. Analysis shows the dust is composed mainly of particles in the 53-micrometre fraction and contains roughly 18.02 weight per cent copper, present chiefly as cuprospinel and chalcopyrite. Major non-copper components include mullite, gypsum, silica, and magnetite, alongside trace amounts of lead and bismuth. Morphological examination reveals spherical to irregular particles, with copper minerals closely associated with tabular gypsum crystals and very fine copper grains embedded inside larger spherical particles. Because of these ultra-fine characteristics and complex mineral associations, standard physical beneficiation of the material is likely to be challenging. Extracting the copper effectively will probably require chemical and metallurgical processing, such as froth flotation followed by leaching and solvent extraction.
Industrial smelting produces fine waste dust that contains significant quantities of valuable metals alongside undesirable impurities. Detailed characterisation of this material reveals whether and how copper can be recovered. Reclaiming valuable elements from industrial by-products supports resource efficiency, reduces waste accumulation, and offers an alternative supply stream of metals that would otherwise remain trapped in smelting residues.
Smelting operations and mineral processing companies could use these findings to design recovery circuits for industrial dust residues. The abstract outlines a potential processing pathway combining froth flotation, leaching, and solvent extraction, but does not test these methods. The work is early-stage research focused purely on material characterisation, meaning substantial metallurgical testing and process optimisation are still required before commercial implementation.
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The CSD from Palabora mining company's copper-plant in Limpopo, South Africa was characterized by particle size, chemical and morphological analyses. The dust from the electrostatic precipitator (EPS) attached to the reverberatory furnace was collected and used for this study. The results obtained showed that the dust contains particles mainly in the 53μm size fraction. As regards chemical composition, it is made up of about 18.02 weight % copper, occurring predominantly as cuprospinel and as chalcopyrite. The major impurities in the dust are 42.97, 11.69, 11.45 and 1.6 weight % of mullite, gypsum, silica and magnetite, respectively with traces of lead and bismuth. Morphologically, the particles range from spherical to irregular in shape, with close association occurring between these spherical minerals suspected to be copper and the tabular shaped minerals likely to be gypsum. Smaller copper particles, 1 to 2μm size, were also found embedded in larger spherical particles 8 to 10μm size. The results obtained thus strongly indicate that the CSD as-received is an ultra-fine, copper rich secondary resource that might have been formed in two stages of condensation. Furthermore, the results indicate that physical beneficiation of the CSD in this size fraction of 53μm may be difficult and solvent extraction with prior froth flotation and leaching may be required to efficiently extract the copper value in it.
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DOI: 10.1016/j.promfg.2016.12.032
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