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Ferric Alum

Ferric alums are manufactured from sulphuric acid (98%), water and Bauxite, which is supplied from Ranchi, Jharkhand. Two types of ferric alums are produced- Gr I & Gr II .The plant is designed to produce ferric alum conforming to BIS: 299-1989 (4th Revision)
 

Characteristics

Gr-I

Gr-II

Insoluble Matter% by weight, max

0.5

0.5

Soluble Iron compounds % by weight, max

0.7

0.7 

Water soluble aluminium compounds % by weight, min

16.0

15.0

PH (of 5% aqueous solution), min

2.7

2.7

Basicity % by weight, max

0.5

0.5

Free acidity % by weight, max

0.5

0.5

Lead (as Lb) ppm, max

30

30

Arsenic (Qs As₂O₃) ppm, max

6

6

Non-ferric alums are produced from Alumina Hydrate [Al (OH)₃]   sulphuric acid 98% and water. Alumina hydrate is being supplied from Nalco & Indulco . The specifications designed for production under BIS 260; 2001 (2^nd Revision) is as follows:
 

Characteristics

Technical Grade

Insoluble matter

0.30

PH (of 5% solution), min

2.8

Iron (as Fe) % By weight, max

0.01

Water soluble aluminium compounds % by weight, min

17.0

Ammonium alum

Ammonium alum is manufactured by boiling bauxite- sulphuric acid liquor with ammonium sulphate [(NH₄)₂] and crystallizing it where coal is used as a fuel.

Besides the above BIS specifications, the plant produces ferric alums of different qualities according to the customers demand. This is the only plant which produces all the three types of alums in Assam. The plant is designed and installed to produce 6000 MT Ferric Alum, 6000 MT Non-ferric alum and 1000 MT Ammonium alum per annum.