Extraction of Metals: Ores and Minerals

Isolation of elements in Chemistry class 12 aims to teach the students about various processes of extraction of metals from ores. Very few metals such as the noble metals, i.e., Gold, Silver, and Platinum etc. are present in their original metallic forms in nature. Metallurgy is the field of science which deals with the extraction of metals from ores which are naturally found in the environment.

Most of the elements especially metals are present combined with other elements and these are called minerals. An element may combine with a variety of other elements to make myriad minerals but out of them, only a few are viable sources of that metal. Such sources are called Ores.

Extraction of metals

The process of extracting metal ores buried deep underground is called Mining. The metal ores are found in the earth’s 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. Ores consist of the desired metal compound and the impurities and earthly substances called Gangue. The extraction of metals and its isolation occurs over a few major steps:

  • Concentration of Ore
  • Isolation of metal from concentrated Ore
  • Purification of the metal

Aluminium:

  • Bauxite                                          AlOx(OH)3-2x [where 0 < x < 1]
  • Kaolinite (a form of clay)          [Al2 (OH)4 Si2O5]

Iron:

  • Haematite                                     Fe2O3
  • Magnetite                                      Fe3O4
  • Siderite                                          FeCO3
  • Iron pyrites                                   FeS2

Copper:

  • Copper pyrites                               CuFeS2
  • Malachite                                        CuCO3.Cu(OH)2
  • Cuprite                                            Cu2O
  • Copper glance                                Cu2S

Zinc:

  • Zinc blend/Sphalerite                   ZnS
  • Calamine                                         ZnCO3
  • Zincite                                              ZnO

You now know about ores and minerals. Learn more about the extracting metals and metallurgy in the next article titled ‘Concentration of Ore’ only on BYJU’s, The Learning App.


Practise This Question

A substance X dissolves very fast when put into a solvent Y at
25C
A substance Z dissolves comparatively slowly when put into solvent Y at 25C
So, I conclude: substance X has more solubility than substance Y.