1
George P Demopoulos, Janice M Zinck, Peter D Kondos: Multiple stage precipitation of heavy metals from acidic aqueous solution. Her Majesty the Queen in right of Canada represented by the Minister of Natural Resources, McGill University, Jones Tullar & Cooper P C, September 30, 1997: US05672280 (5 worldwide citation)

For the removal of heavy metal contaminants from industrial waste water, a method is proposed for preparing a dense precipitate having superior handling and disposal properties. The method comprises incremental adjustment of the pH to maintain a low saturation ratio and recycling of slurry to provid ...


2
Peter D Kondos, Kazi E Haque, John C MacDonald, Wesley F Griffith, Daniel Laforest, Joe Iuliano: Use of microwave radiation to eliminate foam in ore leaching. Her Majesty the Queen in right of Canada represented by the Minister of Energy, Jones Tullar & Cooper, February 25, 1992: US05091160 (3 worldwide citation)

A method of eliminating the foam above a slurry of a corrosive liquid and solid matter where the foam is caused by a gas evolved by the reaction between the heated corrosive liquid and the solid matter comprising providing the heating energy by microwaves. This method has been found to be particular ...


3
Yeonuk Choi, Peter D Kondos, Jacques McMullen: Process for reduced alkali consumption in the recovery of silver. Barrick Gold Corporation, Sheridan Ross P C, August 28, 2012: US08252254

The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by hot curing of the autoclave discharge slurry followed by decomposition of argentojarosite using strong acid consumers.


4
Yeonuk Choi, Peter D Kondos, Jacques McMullen: Process for reduced alkali consumption in the recovery of silver. Barrick Gold Corporation, Sheridan Ross PC, December 20, 2007: US20070292326-A1

The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by hot curing of the autoclave discharge slurry followed by decomposition of argentojarosite using strong acid consumers.