A silver mine in Mexico, had started up a new cyanidation plant to increase its silver bar production.
With increasing production they found the following problems;
- Filtering the tailings coming from silver production, succeeding in recovering the highest quantity of water to use back in the process
- The recovery of cyanides (one of the main costs of the Merrill Crowe process);
- Environmental impact reduction, eliminating the tailing ponds.
Bilfinger Water Technologies was awarded the contract to supply filter presses to the silver mine.
A sludge dewatering plant comprising of 3 Diemme® Filtration GHT 2000 filter presses were supplied. Each press is able to dewater large amounts of dry solids reaching a very low residual cake moisture. The sludge dewatering plant is able to recover and return up a very high percentage of water, that is very important in Countries with few water resources.
In the previous year, the same mine also purchased 4 Diemme® Filtration AUTOMAT 1500 filter presses, employed in the Merril Crowe process.