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

What is composition of Wrought Iron ?

Wrought iron:

Wrought is made by heating cast iron with haematite (Fe₂O₃) which oxidises C to CO, S to SO₂ Si to SiO₂, P, P₄O₁₀ and Mn to MnO . Where CO and SO₂ escapes, manganese oxide (MnO) and Silica (SiO₂) combine to form slag.

Similarly phosphorus pentoxide combines with haematite to form ferric phosphate slag.

What is composition of Grey Cast Iron ?

Grey Cast Iron: However when re molted pig iron is slowly cooled, Grey cast iron is results. In this form of cast iron carbon is found to be combined form of Graphite.

What is composition of White cast iron ?

White Cast Iron: When re molted pig iron is suddenly cooled, white cast iron is results. In this form of cast iron carbon is found to be combined form as cementite (Fe₃C).