Processes for separating the metal from the impurities it is found with or the other elements with which it is combined depend upon the chemical nature of the ore to be treated and upon the properties of the metal to be extracted. Gold and silver are often removed from the impurities associated with them by treatment with mercury, in which they are soluble.
The process of extracting metal ores buried deep underground is called Mining. The metal ores are found in the earths crust in varying abundance. The extraction of metals from ores is what allows us to use the minerals in the ground! The ores are very different from the finished metals that we see in buildings and bridges.
Oct 09, 2020· The extraction of the metals from the calcined or roasted ore consists of two steps i.e., removal of earthy impurities and reduction of the ore to metal. The different methods applied for carrying out the concentration of ores are useful to separate only a part of gangue and the ore still contains some earth impurities.
Thus, for example, the three metals in copper/lead/zinc ores can be floated into three concentrates, each containing one of the metals. The process of flotation is sometimes also used in electrochemical waste treatment . Extractive metallurgy Metal sulfide flotation concentrates can be treated in a number of ways.
Mineralogical analysis. A successful separation of a valuable mineral from its ore can be determined by heavy liquid testing, in which a single sized fraction of a ground ore is suspended in a liquid of high specific gravity. Particles of less density than the liquid remain afloat, while denser particles sink.
Magnetic separation method . Principle: The magnetic properties of the ores form the basis of separation. When either the ore or the gangue is magnetic, this method is employed. e.g., Tinstone SnO2, the ore of tin. Method: The crushed ore is placed over a conveyer belt which rotates around two metal wheels, one of which is magnetic. The magnetic particles are