Patents

4,051,220 Sodium sulfide leach process
4,041,126 Separation and selective recovery of platinum and palladium by solvent extraction
4,039,324 Fluidized hydrogen reduction process for the recovery of copper
4,029,741 Recovery of antimony sulfides
4,013,457 Process for the recovery of cuprous chloride in the presence of metal impurities
4,012,481 Process for the separation of platinum group metals
4,011,146 Process for separation and recovery of metal values from sulfide ore concentrates
3,973,949 Zinc recovery by chlorination leach
3,972,795 Axial flow electrolytic cell
3,972,711 Cuprous chloride recovery process
3,961,914 Process for treating coal to make it resistant to spontaneous combustion
3,957,602 Recovery of copper from chalcopyrite utilizing copper sulfate leach
3,942,765 Static mixing apparatus
3,939,256 Sulfur recovery process
3,938,966 Process for improving coal
3,929,461 Fusion-oxidation process for recovering vanadium and titanium from iron ores
3,927,169 Ion exchange process for the recovery of copper
3,901,776 Process for the recovery of copper from its sulfide ores
3,890,426 Method of treating alunite ore
3,890,425 Redox treatment of alunite ore

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