The Physics of Ore Flotation

Swinburne, J.; Rudorf, G.

doi:10.1038/scientificamerican02241906-25202supp

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“…Flotation has been routinely used for over a century for separation of suspended mineral particles. 20 The technique depends on the difference in surface wettability of valuable versus waste minerals to physically separate mineral suspensions. In aqueous solutions, mineral particles with weak adhesion to water (oil-wet or hydrophobic) can remain in suspension or float, while particles with strong adhesion to water (water-wet or hydrophilic) will sink.…”

Section: Introductionmentioning

confidence: 99%

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Novel Application of the Flotation Technique To Measure the Wettability Changes by Ionically Modified Water for Improved Oil Recovery in Carbonates

Sohal

Thyne²,

Søgaard

2016

Energy Fuels

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The accurate determination of the wetting condition of carbonate reservoirs is a prerequisite for the selection of any enhanced oil recovery (EOR) fluid. Most carbonate formations are initially oil-wet to intermediate-wet at reservoir conditions. In order to correctly chose an EOR fluid to alter the wettability, we need to understand the initial wetting conditions and design an ionically modified water (advanced water) to alter wettability and improve oil recovery. If a reservoir has already been reached to the optimum wetting conditions by injecting formation water or any other fluid, then there is no need for ionically modified water. A number of methods have been devised to identify the wetting conditions including contact angle measurements, spontaneous imbibition, and chromatographic separation, etc. But contact angle measurement requires surfaces that lack natural surface roughness, spontaneous imbibition tests take months, and chromatographic separation is feasible only for core flooding in sulfate free carbonates at low temperature. A novel application of the well-established technique known as flotation was used in this study to measure the oil-wet and water-wet percent of pure biogenic chalk (Dan Chalk from Denmark). It is an accurate, fast, and most reliable method to quantitatively measure the water-wet and oil-wet fractions of a reservoir rock. It determines the potential of advanced water to improve wettability within days, instead of measurements that can take months and require expensive equipment. Using this technique we were able to quantify the wettability alteration caused by low salinity and potential determining anions (PDAs) such as SO4 2–, BO3 3–, and PO4 3–. The wettability data show maximum oil recovery by dilution is coincident with maximum wettability alteration. The experiments also show that the presence of sulfate or borate enhances wettability alteration by dilution. Moreover, the combined and individual effect of potential scale forming ions (Ba2+ and Sr2+) on wettability restoration was identified. The effect of interfacial tension (IFT) on the measured wettability alteration and the amount of oil attached to the water-wet percent of rock was also determined.

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Section: Introductionmentioning

confidence: 99%

“…Flotation has been routinely used for over a century for separation of suspended mineral particles . The technique depends on the difference in surface wettability of valuable versus waste minerals to physically separate mineral suspensions.…”

Section: Introductionmentioning

confidence: 99%

Novel Application of the Flotation Technique To Measure the Wettability Changes by Ionically Modified Water for Improved Oil Recovery in Carbonates

Sohal

Thyne²,

Søgaard

2016

Energy Fuels

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James Swinburne, 1858-1958

Freeth¹

1960

Biogr. Mems Fell. R. Soc.

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James Swinburne lived to be over one hundred years of age, the third Fellow of the Royal Society to do this. The first was Sir Moses Haim Montefiore who was born in Leghorn on 24 October 1784 and died in this country on 28 July 1885, having settled here as a young man. He was elected into the Society on 16 June 1836. He is still well remembered as an outstanding philanthropist and a fearless defender of his fellow Jews all over the world. The second was Henry Nicholas Ridley the botanist who died in 1956. One other Fellow who died a few days before his hundredth birthday might well be mentioned; he was Bernard le Bovier de Fontenelle, Secretary of the Académie des Sciences and later President of that body. Fie was born on 11 February 1657 and died on 9 January 1757. Family, Early Life and Background The Swinburne family is an ancient one as a glance at Burke's Peerage will show; they are essentially Northumbrian. The baronetcy dates from 1660. John Swinburne, father of the first Baronet, was promised a baronetcy by Charles I but the patent of creation never passed the seal. He died in 1652, eight years before the Restoration, His son, also John Swinburne, was created a Baronet in 1660 and is called in the patent ‘Virum patrimonio censu et morum probitate spectabilem’. Swinburne on his father’s side was descended from Flotspur, of whom he dryly remarks in his personal record ‘was a lively member of society but not noticeably scientific’. One of Swinburne’s ancestors (Sir John Swinburne, Bart.) was a Fellow of the Society elected 26 February 1818. Like so many of his contemporaries of the period he was an ardent antiquarian and F.S.A. Humphry Davy was his proposer for the Society. He founded the Antiquarian Society of Newcastle upon Tyne, closely modelled on the L.S.A., and during his lifetime maintained the most friendly intercourse between the two Societies. He, like our Swinburne, lived to a great age, dying a few weeks short of his entry into his hundredth year.

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The Physics of Ore Flotation

Cited by 2 publications

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Novel Application of the Flotation Technique To Measure the Wettability Changes by Ionically Modified Water for Improved Oil Recovery in Carbonates

Novel Application of the Flotation Technique To Measure the Wettability Changes by Ionically Modified Water for Improved Oil Recovery in Carbonates

James Swinburne, 1858-1958

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