Subsequent differential flotation
of the pyrite allows for separate sequestration of the acid-forming minerals.
Zinc and copper concentrates are produced by differential flotation
and are sold to Zincor and O'Okiep respectively.
Metallurgical work completed to date on samples from the Navidad deposits has demonstrated that Navidad mineralization is amenable to concentration by simple, cost effective, and environmentally benign differential flotation
Phase II involves rehabilitation of previously mined underground operations and conversion of the concentrator to differential flotation
to allow production of separate lead, zinc and gold concentrates.
Complex mineralogy dictated differential flotation
Manganese was not recovered by the mine owner but Vena is currently testing a differential flotation
flowsheet to recover this mineral.
The Escobal project is based on underground mining, utilizing low-cost development and production methods; a processing plant employing crushing, grinding, and differential flotation
to produce lead and zinc concentrates; and a dry-stack tailings facility.
8M mt would be mined by underground methods and processed by differential flotation
at a nominal rate of 850 mt/d.
However, Reminex built a 180t/d pilot plant in 1988 and work with this showed that differential flotation
, recovering the lead, followed by the copper, followed by the zinc, would be a better process.
The process flowsheet is based on a conventional three-stage crushing circuit and differential flotation
for the production of three separate concentrates.
The pilot plant was a 120 mt/d operation set up to optimize the differential flotation
process and act as a training ground for operators.
Similarly seasonal variations in water quality, because of periods of drought, can also cause adverse effects on plant production and results, especially where selective or differential flotation