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History of exploitation of gold from Danube river sandy gravels is centuries long. Interesting on it continues to the 1970пїЅs. Extaction of heavy minerals (HM) concentrate was never intend. About 1 milion m3 of sandy gravels is exloited in Slovak part of Danube basin for construction usage. Production of HM concentrate with gold as by-product can improve economy of exploitation. With average content 6,55 kg of HM in m3 of sandy gravels there is possibility to produce about 6500 t of HM concentrate with up to 30 k...

Slag is one of the by-products of energy industry which is suitable for secondary industrial processing. Although slag has been successfully used in industrial production for several decades its use does not achieve the level of its potential. This work describes the improvement of mechanical properties of alkali activated binders пїЅ geopolymers made of slag. The effect of mechanical activation on mechanical properties of geopolymers was examined. Mechanical activation was made with ball mill and different time o...

This study is focused on the flotation of scheelite (CaWO4) ore with a sample from OchtinпїЅ, Slovakia. Scheelite as an important tungsten - bearing mineral is often nowadays treated mainly by froth flotation. Such a treatment of scheelite mineral includes crushing, grinding and sorting, followed by gravity separation which is a very significant process for obtaining marketable grade mineral concentrates. A significant step is flotation processing which is based on the difference in chemical and physical propertie...