Wednesday, August 07, 2013

Ferric & Non-ferric ALUM for water treatment

Here are some details FOR QUICK REVIEW..
Bauxite lumps are crushed  fed to a closed circuit grinding mill in which it is further
reduced in size. The ground bauxite is fed at a regulated rate to digester containing sulphuric acid and water. The Al2O3 in bauxite reacts with Sulphuric Acid to form Aluminum Sulphate. The reacted mass is then led to a series of settlers in which the unreacted particles settle down. The liquor containing Aluminum Sulphate is evaporated in steam heated evaporators where the liquor is concentrated to final product containing 16-17% Al2O3. The product is cooled in moulds
Alums are usually the double salts of ammonium, potassium or sodium sulphate with aluminium, chromium or iron sulphate, and are readily prepared by concentrating and cooling a solution containing molecular proportions of the component sulphate. Ferric alum mainly used in paper sizing and in water treatment. Demand for ferric alum is arising for making water more soft for drinking and industrial uses. Present production of ferric alum is insufficient to satisfy the demand and supply. It provides good scope to many new units to enter in this industry.
Plant capacity: 30 Metric Tons per Day
Plant & machinery: INR 50.00 Lacs (roughly)
Working capital: INR 75 Lacs ( approximately)

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