Exjobbsförslag från företag

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Förslaget inkom 2003-09-08

Surface chemistry studies of froth dynamics and structures

OBS! ANSÖKNINGSTIDEN FÖR DETTA EXJOBB HAR LÖPT UT.
This Master's thesis project (exjobb) is to be carried out within YKI's Chemical and Engineering Industries Section. YKI, Ytkemiska Institutet AB (Institute for Surface Chemistry) is an internationally leading research centre in applied surface and colloid chemistry. Knowledge about surface chemical phenomena e,g, cleaning, adhesion and surface modification is of importance for process and product development in different areas. YKI therefore works with most industrial sectors including chemical producers, engineering industries, forest products, plastics, paint, packaging, pharmaceutical, biotechnology and food industries. Our industrial partners range from multinational companies to domestic small and medium-sized enterprises (SMEs). YKI has 80 member companies worldwide. YKI is located in a research-intensive area on the campus of the technical university (KTH) in Stockholm, close to Stockholm University and the medical university Karolinska Institutet. See http://www.surfchem.kth.se for further information.

The goal of the project is to carry our research into froth dynamic and structures, which could lead to improvement in recovery, selectivity and efficiency in the froth flotation process which is one of the key separation processes in the treatment of many different types of materials. In the mineral industry alone, seven million tons of copper are produce annually in the western world by the flotation process and also huge quantities of zinc, lead, gold and many other non metallic minerals are produced. We will study the influence of frother chemistry, structure and concentration in relationship to the characteristics of the mineral particle (i.e. size, shape, heterogeneity, hydrophobicity) and the aqueous environment (circuit water). In addition, we plan to study the capture and attachment of particles to the bubble surfaces and also the transportation of particles to and from the froth (entrainment).

We also plan to use a range of cutting-edge experimental techniques such as the Froth Scan column, which is a new analytical method for analysing foams. This will enable us to determine the bubble size, stability index, density, foam expansion, coefficient, head retention value, coalescence, distribution: dynamic surface tension measurements, (to separate the time scales for interfacial adsorption of frother molecules, collector molecules and particles). We will also study the influence of these components on rheology, interfacial elasticity and drainage of thin frother films. Both traditional fatty acid and amine frothers will be studied as well as novel synthetic types of frother systems (polyglycol type systems).

Praktisk information
Omfattning: 20 poäng. Start: snarast enligt överenskommelse. Lämplig bakgrund för dig som söker är kemi/kemiteknik eller motsvarande.

Intresserad? Kontakta snarast
Dr Robert Pugh, YKI, tel. 08-790 99 33 / [email protected]


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