Page 36 - Technology Compendium

CSIR-IMMT/EXM - 07

Production of alum from waste aluminum dross

Advantages / Salient Technical Features IPR Status / Details (India/Abroad)
• The dross residues which contains alumina, aluminum • Relevant Indian Patent No. 254794
metallic fines are brought to solution by aggressive
sulphuric acid leaching at 85- 95ºC. Application/Uses
• The plant to treat dross is equipped with all • The product alum will be used for
pollutions control measures to control pollution due effluent treatment in chemical industries,
to solid, liquid and gases by providing wet scrubbers, Municipalities, hospitals, paper industries,
treatment plants, exhaust fans, collection pits, leather industries etc.
recycling facilities.

Scale of Development
Problem being addressed
• The material is potentially valuable as it contains • 20 ton of alum per day. (Current TRL Level : 09)
high aluminum metal values that can be processed
using various treatment options for producing wide Commercialization Status
range of saleable products such as Alum, alumina and • Licensed to M/s A.K. Enterprisers who has
aluminum chloride. put up the plant for commercial production
with technical support from CSIR-IMMT. The
Environmental Considerations (if any) plant has been designed to produce 20 ton
• Release of toxic gases such as HF, Acid mist etc. of alum per day.
duringm acid leaching and could be removed through
scrubbing followed by their stabilization. The plant Techno-economics
is equipped with all pollutions control measures to • One of the most suitable processes with a
control pollution due to solid, liquid and gases by payback period of 1 year
providing wet scrubbers, treatment plants, exhaust
fans, collection pits, recycling facilities. Technology Package
• Process flow sheet, Basic engineering
Major Raw Materials to be Utilized
• Waste aluminium dross from aluminium industries

34