Metallurgical Testwork

Flotation Process Development in Laboratory

Differential and preferential flotation

The pressing problems in differential and preferential flotation of ores are (1) the separation of lead sulphide from zinc sulphide, and (2) the separation of zinc and copper bearing sulphides from sulphides of iron.

Methods seeking separation of one sulphide from another by flotation are of two classes, viz.: (1) those in which a difference in flotability of the two minerals is created or enhanced by conscious control of one or more of the activating phenomena of the process, and (2) those in which the chemical nature of one of the sulphides is changed, with a resulting change in the nature of the surface. Methods of the first class truly accomplish “differential flotation” and this denomination should be closely restricted to such methods. Methods of the second class, by preferential chemical action, so change one of the sulphide minerals that it never floats, leaving the unaltered mineral to float under proper conditions. Freeman (Min. and Sci. Press, June 5, 1920, abstract from Proc. Australasian Inst, of M. and M.) calls this “preferential flotation” and this terminology may profitably be adopted.

Differential flotation of galena in the presence of blende may be brought about, in pulp-body concentration, by proper control of gasification and of kind and quantity of “oil,” in the presence of fresh ….Read more

Laboratory Flotation Testing

Batch Laboratory Flotation Testing starts from the 3 fundamental types of flotation processes or methods which can be classed as either:

  1. Bulk flotation
  2. Differential flotation
  3. Sequential flotation

While all flotation processes are selective or differential in that one mineral or group of minerals is floated away from accompanying gangue, bulk flotation generally refers to separation of unlike mineral types such as sulfides from non-sulfides. Differential flotation (exemplified, for instance, by the concentration and subsequent successive removal of Cu, Pb, Zn and Fe sulfides from a single ore) on the other hand, is restricted to operations
involving separation of similar mineral types.

Batch Froth flotation Testing is a means of treating a pulp of finely ground ore so that it yields the valuable or desired mineral in a concentrate that will be amenable to further processing. The process involves the imparting of a water repellent (hydrophobic) character to the wanted mineral particles by chemicals that are called collectors or promoters. Under favorable conditions, these chemically coated particles become attached to the air that is bubbled through the pulp, and will thus “float” on the surface.Laboratory Flotation Testing

If the surface tension of the pulp is then reduced by ….Read more

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