During Hindalco’s copper production processes, by-products such as sulphuric acid, copper slag, phospho-gypsum and hydrofluosilicic acid are formed. Hindalco is in the process of setting up an aluminium fluoride manufacturing facility using its by-product hydrofluosilicic acid.
Hindalco produces sulphuric acid of IS 266/1993 technical grade. The sulphuric acid plants use the DCDA process and were designed by Monsanto Envirochem (USA).
Hindalco’s phosphoric acid plant is based on the Prayon Mark IV dihydrate technology provided by SNC Lavalin (Belgium).
- Phospho gypsum is manufactured in Hindalco’s phosphoric acid plant.
- Copper slag (iron silicate)
- Copper slag is produced during the smelting of copper in Hindalco’s copper smelter at Dahej.