الفهرس 
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Abstract
The present thesis is devoted to the application of physical concentration and separation methods used in ore dressing techniques to two different materials:
The first is the retrieve treatment of one valuable solid waste produced in the manufacture of the welding rods.
The second is upgrading glass sand which is a major mineral resource in Egypt.
This is to show that the science and the techniques of ore dressing, which is a main application of geological sciences, can also serve to solve an environmental problem and retrieve valuable materials, as well as upgrading glass sand.