Case studies
Sasol mines, South Africa
Thermal evaporation and crystallisation reduces operating costs and recovers products from mine water effluent.
THE CHALLENGE
Sasol Mines needed to treat excess mine water in order to access their reserves. However, the high costs typically associated with the disposal of mixed salts, meant that this process would be an expensive one.
OUR SOLUTION
PROXA developed a thermal Zero Liquid Discharge (ZLD) plant that incorporated a staged thermal evaporation and crystallisation approach. This enabled us to produce by-products from the effluent mine water feed, eliminate the need for disposal of mixed salts at a landfill site and make water available for reuse.
HOW PROXA ADDED VALUE
By recovering by-products, we were able to reduce operating costs associated with mixed salt disposal.
FEED WATER
Mine water
BY-PRODUCTS
Calcium sulphate- Sodium sulphate
- Sodium chloride
PRODUCT WATER
- Water for reuse
ENVIRONMENTAL PROTECTION
PROXA’s innovative solution to the disposal of the mine’s mixed salts supported the client’s drive to minimise its impact on the environment.
Client: Sasol Mines
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