Patents

4,754,953 Utilization of oxygen in leaching and/or recovery procedures employing carbon
4,721,526 Heap leaching with oxygen
4,708,804 Method for recovery of cyanide from waste streams
4,690,752 Selective flocculation process for the recovery of phosphate
4,648,964 Separation of hydrocarbons from tar sands froth
4,629,502 Pressurized reaction of refractory ores with heat recovery
4,618,480 Recovery of alumina values from alunite ore
4,606,764 Method of recovering metals from ores using a formate reducing agent
4,582,613 Use of copper (II) oxide as source of oxygen for oxidation reactions
4,557,905 Leaching and washing a flocculated slurry having a fiber content
4,556,422 Process for the recovery of lead and silver chlorides
4,552,589 Process for the recovery of gold from refractory ores by pressure oxidation
4,548,794 Method of recovering nickel from laterite ores
4,541,994 Method of liberating nickel- and cobalt-enriched fines from laterite
4,541,868 Recovery of nickel and cobalt by controlled sulfuric acid leaching
4,501,721 Leaching and washing a flocculated slurry having a fiber content
4,460,459 Sequential flotation of sulfide ores
4,459,103 Automatic volatile matter content analyzer
4,428,912 Regeneration of chloridizing agent from chlorination residue
4,423,012 Manganese and zinc solvent extraction process

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