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Browsing by Subject "surface energy distributions"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Ziarna hydrofilowe w przemysłowym procesie flotacji węgli o różnym stopniu uwęglenia
    (2006) Lenartowicz, Marek; Sablik, Jerzy
    Presence of hydrophilic particles, which surfaces have surface tension of wetting Gamma/c equal or higher than surface tension of the zero contact angle [formula] (57.87 mJ/m square) in a group of particles obtained from a lump of coal, feeds and products obtained from sampling IZ-12 type flotation machine washing coals of different rank has been investigated. The distribution curves of surface tension of wetting of an investigated group of particles obtained by film flotation method and the value of the surface tension of the zero contact angle has been used in order to appoint a percentage content of hydrophilic particles. It has been found that the number of hydrophilic particles in a lump of coal, feed and washing products decrease with the growth rank of coal. What is more, the investigation shows that the hydrophilic particles pass into the concentrate products probably on the basis of a mechanical curry of mineral particles, curry of intergrowth, and formation of slime coating on tailings particles and scraping by scrappers with flotation pulp. To sum up, the analysis of the distribution of hydrophilic particles and surface tension of wetting in flotation products obtained in industrial IZ type flotation machine can be used for the evaluation of the technology of flotation and the work performance of this machine.