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Phosphate as a potential substitute for dichromate, when depressing galena in copper and lead separation
Boliden Mineral, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
2019 (English)In: IMPC 2018 - 29th International Mineral Processing Congress, 2019, p. 1610-1618Conference paper, Published paper (Refereed)
Abstract [en]

The depressive effect of dichromate on galena was evaluated with chemical experiments and small-scale depression experiments at a pH of around 12. The depressive effect was measured with Dynamic Vapor Sorption (DVS), which measures the water uptake of a sample as a function of the % relative humidity. The depression is due to PbCrO4PbO, which in the presence of Ca2+ and SO4 2- forms a more or less amorphous solid solution (Pb,Ca)(CrO4,SO4)PbO, which clogs to the surfaces of the ore. Free Pb2+- ions are needed for depression to occur and at high pH Pb2+ - hydroxide complexes, supply enough Pb2+ - ions to precipitate (Pb,Ca)(CrO4,SO4)PbO. In air CO2, precipitates CaCO3 which slowly lowers pH, precipitating more (Pb,Ca)(CrO4,SO4)PbO and CaCO3 on galena. Similar experiments where performed with five alternative depressors whereof phosphate, which forms an amorphous precipitate of approximate composition Pb3Ca13(PO4)10SO4, gave the best results. Phosphate was tested in laboratory scale flotation experiments giving encouraging results. 

Place, publisher, year, edition, pages
2019. p. 1610-1618
Keywords [en]
Copper, Depression, Dichromate, Flotation, Galena, Lead separation, Phosphate, Calcite, Calcium carbonate, Chromates, Lead oxide, Phosphates, Precipitation (chemical), Amorphous precipitate, Amorphous solid solutions, Dynamic vapor sorption, Lead separations, Water uptake, Copper compounds
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-37017Scopus ID: 2-s2.0-85059392745ISBN: 9787030227119 (print)OAI: oai:DiVA.org:ri-37017DiVA, id: diva2:1281061
Conference
29th International Mineral Processing Congress, IMPC 2018, 17 September 2018 through 21 September 2018
Available from: 2019-01-21 Created: 2019-01-21 Last updated: 2019-08-09Bibliographically approved

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CiteExportLink to record
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