How does leaching of aluminium ore take place by Baeyer' process?

Baeyer's Process: By Bayer's process commercially it is being carried out (for red bauxite) In other words this process is applied to the bauxite ore containing ferric oxide (red bauxite Fe₂O₃) as chief impurity. Ore roasted to convert ferrous oxide to ferric oxide.

What are important ores of Aluminium ?

Important ores of Aluminium:

(1) Corundum (Al₂O₃)

(2) Diaspore (Al₂O₃.H₂O)

(3) Bauxite (Al₂O₃.2H₂O)

(4) Gibbsite (Al₂O₃.3H₂O)

(5) Cryolite (AlF₃.3NaF) or Na₃AlF₆

(4) Alunite (K₂SO₄.Al₂(SO₄)₃.4Al(OH)₃

(5) Spinel (MgOAl₂O₃)

(6) Felspar (K₂O.Al₂O₃.6SiO₃) or KAlSi₃O₈

(7) China Clay or Kaoline [Al₂O₃.2SiO₂.2H₂O]

What are important ore of Iron ore ?

Important Ores of Iron:

SN	Ores	Formula
1	Haematite (Red)	Fe2O3
2	Magnetite	Fe3O4
3	Siderite or Spathic	FeCO3
4	Iron Pyrite (fool's Gold)	FeS2
5	Goethite	FeO(OH)
6	Limonite	2Fe3O4.3H2O
	Others Ores
7	Ilmenite  (FeO+TiO2)	FeTiO3
8	Chromite (FeO+Cr2O3)	FeCr2O4