a) Describe the distinguishing features of (i) polar, and (ii) non-polar mineral
ID: 713924 • Letter: A
Question
a) Describe the distinguishing features of (i) polar, and (ii) non-polar mineral surfaces. 4 points) b) Discuss how the polar or non-polar nature of the surface influences the ability of the relevant particles to be recovered in a flotation process. (2 10001miiss) Describe a contact angle measurement and explain how this can be used as an indication c) of the relative hydrophobic or hydrophilic character of the surface. (2 points) Describe the mechanisms of collector adsorption onto a non-sulfide mineral occurring by d) (i) chemical adsorption and (ii) physical adsorption. (4 points) e) Describe a step by step test procedure to establish whether a new flotation reagent that has been suggested is more effective than the one currently used in a given operating flotation plant.Explanation / Answer
The minerals can be classified as polar or non polar based on nature of surface
Polar minerals: they have strong covalen and ionic bonds on the surface and thus have surface energy higher than water so the surface can be easily wetted by water, The surface is hydrophilic
Non polar minerals: they have covalent and weak van der waal forces and are hydrophobic with surface energy less than water. They posses poor wettability with water.
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