1
Willem P C Duyvesteyn, Julia Rose Budden, Merijn Amilcare Picavet: Extraction of bitumen from bitumen froth and biotreatment of bitumen froth tailings generated from tar sands. BHP Minerals International, Hopgood Calimafde Kalil & Judlowe, October 19, 1999: US05968349 (370 worldwide citation)

A process for the extraction of bitumen from bitumen froth generated from tar sands is disclosed. In this process, bitumen froth is extracted from tar sands using a water process without requiring the use of caustic soda. The froth is treated in a counter-current decantation circuit with a paraffini ...


2
William P C Duyvesteyn, James S Hanson, James J Lutch: Extraction of bitumen from bitumen froth generated from tar sands. BHP Minerals International, Hopgood Calimafde Kalil & Judlowe, December 28, 1999: US06007709 (76 worldwide citation)

A process for the extraction of bitumen from bitumen froth generated from tar sands is presented. In this process bitumen froth, extracted from tar sands using a water process not requiring the use of caustic soda, is treated in a counter-current decantation circuit with a paraffinic solvent to remo ...


3
Willem P C Duyvesteyn, Julia Rose Budden, Bernardus Josephus Huls: Biochemical treatment of bitumen froth tailings. BHP Minerals International, Hopgood Calimafde Kalil & Judlowe, June 13, 2000: US06074558 (45 worldwide citation)

A process for the biological treatment of bitumen froth tailings produced from a tar sands treatment and bitumen froth extraction process is disclosed. In this process bitumen froth tailings, containing native hydrocarbon metabolizing microorganisms, are mixed with a growth media to form an inoculum ...


4
Daniel H Payne, Leonard C Schmitt: Management system for documents stored electronically. BHP Minerals International, Hopgood Calimafde Kalil & Judlowe, July 18, 2000: US06092090 (41 worldwide citation)

A system for managing large quantities of business related documents stored electronically requires little or no reliance on the corresponding hardcopy versions. The management system data includes a processing approach that allows for the creation of documents electronically, i.e., by virtual docum ...


5
Willem P C Duyvesteyn, Manuel R Lastra, Houyuan Liu: Method for recovering nickel from high magnesium-containing Ni-Fe-Mg lateritic ore. BHP Minerals International, Hopgood Calimafde Kalil & Judlowe, November 5, 1996: US05571308 (19 worldwide citation)

A method is provided for recovering nickel from high magnesium-containing lateritic ores which also contain iron. The ores which are referred to as saprolitic ores are subjected to leaching with a mineral acid from the group consisting of HCl, H.sub.2 SO.sub.4 and HNO.sub.3, HCl being preferred.


6
Willem P C Duyvesteyn: Recovery of base materials from geothermal brines. BHP Minerals International, Hopgood Calimafde Kalil Blaustein & Judlowe, July 20, 1993: US05229003 (19 worldwide citation)

A process is provided for the recovery of substantially pure zinc from geothermal brine also containing recoverable amounts of lead and silver. The process comprises selectively extracting lead and silver from the brine and then contacting the brine impoverished in lead and silver with a substantial ...


7
Willem P C Duyvesteyn, Teun Bakker, Manuel R Lastra: Hydrometallurgical process for producing zinc oxide. BHP Minerals International, Hopgood Calimafde Kalil & Judlowe, August 15, 1995: US05441712 (15 worldwide citation)

A hydrometallurgical process for producing zinc oxide from an aqueous solution containing zinc ions is provided. The process comprises the steps of contacting a zinc solution with an insoluble organic solvent selective to the extraction of zinc and thereby produce a zinc-loaded organic solvent. The ...


8
Willem P C Duyvesteyn, David A Neudorf, Erik M Weenink: Resin-in-pulp method for recovery of nickel and cobalt. BHP Minerals International, Brinks Hofer Gilson & Lione G Peter Nichols, February 26, 2002: US06350420 (12 worldwide citation)

A process is provided for the direct recovery of nickel and cobalt from a nickeliferous oxide ore leach slurry by ion exchange. A nickeliferous ore is leached with mineral acid to solubilize the metals. The resulting leach slurry is contacted with ion exchange resin, which selectively loads the nick ...


9
Willem P C Duyvesteyn, Houyuan Liu, Michael J Davis: Heap leaching of nickel containing ore. BHP Minerals International, G Peter Nichols, Brinks Hofer Gilson & Lione, November 6, 2001: US06312500 (9 worldwide citation)

A process is provided for heap leaching ore to recover nickel. The process is particularly effective for ores that have a tangible clay component (i.e., greater than about 10% by weight). The process includes sizing the ore (where necessary), forming pellets by contacting ore with a lixiviant and ag ...


10
J Carlos Arroyo, David A Neudorf: Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores. BHP Minerals International, G Peter Nichols, Brinks Hofer Gilson & Lione, July 17, 2001: US06261527 (7 worldwide citation)

A process is provided for leaching nickeliferous laterite ores by hydrometallurgical methods at temperatures below the boiling point of the pulp and at atmospheric pressure from which high overall nickel and cobalt extractions are obtained. The high iron fraction of the laterite, referred to as limo ...