INFLUENCE OF FOAMS’ AND FOAM FILMS’ PROPERTIES
ON FLOTATION RELEASE OF ORGANIC LIQUID

Vilkova Natalya Georgievna, Doctor of chemical sciences, professor, sub-department of physics and chemistry, Penza State University of Architecture and Construction (28 G. Titova street, Penza, Russia), ngvilkova@mail.ru

544.7 : 54.058

10.21685/2307-9150-2016-2-4

Background. Flotation represents a process of division of small firm particles (mainly minerals) in a water suspension or solution based on selective adsorption of particles at the liquid/gas boundary according to their wettability. This process was traditionally used for mineral processing in the mining industry. Recently, flotation and foamy separation have been widely applied in water purification from surfacetants, proteins, dispersed nanoparticles, to liberate oil and oil products. The work purpose is to study the influence of properties of foams and foam films received from the water solutions containing surfactant-sodium dodecylsulfate, gelatinе and organic liquid, on the efficiency of flotation.
Materials and methods. The conductometrical technique was used to investigate film thinning and rupture. The size of drops of organic liquid was determined with the help of the turbidimetric method. Determination of oil product content was car-ried out by the fluorimetric method. The expansion rate of foam was defined at its exit from the generator. The author determined the comparative stability of the foams containing an organic phase by the height of the dynamic foam layer.
Results. The steadiest foams from sodium dodecylsulfate (DDSNa) and gelatine in the presence of an organic phase (benzol and diesel fuel) can be received at рН = 5–7. The greatest stability is characteristic of the foams received from the solution 2 · 10–3mole/l DDSNa + 0,1 % gelatin at the change of concentration of an organic phase from 158 to 320 mg/l. The maximum stability of the foam prepared from the mentioned composition provides up to 97 % efficiency of the flotation re-lease of diesel fuel (DF). The macroscopic foamy films’ thickness depends on the DT concentration and the ratio of protein and surfactant in the initial solution. At the maximum concentration of an organic phase the macroscopic films, received from the solutions of gelatine and surfactant, quickly collapsed at the thickness about 100 microns.
Conclusions. The steadiest foams, containing an organic phase received at the certain ratio of gelatine and odium dodecylsulfate in the initial solution, provide an efficient flotation release of diesel fuel. The isolated macroscopic foamy films, received from solutions of protein and surfactant, at the maximum concentration of an organic phase quickly collapsed at the thickness about 100 microns. Their thickness didn’t dependent on the ratio of gelatine and surfactant in the initial solution.

foams, foam films, organic liquid, flotation.

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