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| 1 |
6,921,474 |
Chloride melt process for the separation and recovery of zinc
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| 2 |
6,863,873 |
Process to produce simonkolleite, zinc oxide and zinc hydroxide
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| 3 |
6,852,237 |
Method for improved recovery of metals
|
| 4 |
6,770,249 |
Process to selectively recover metals from waste dusts, sludges and ores
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| 5 |
6,726,889 |
Production of zinc oxide from acid soluble ore using precipitation method
|
| 6 |
6,696,037 |
Method of recovering sulfur from minerals and other sulfur-containing
compounds
|
| 7 |
6,666,903 |
Method for improved recovery of metals
|
| 8 |
6,517,789 |
Method for reclaiming constituents from an industrial waste stream
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| 9 |
6,475,450 |
Method of leaching zinc concentrate
|
| 10 |
6,471,849 |
Process for the recovery of zinc from a zinc sulphide ore or concentrate
|
| 11 |
6,423,281 |
Method for reducing the formation of Zn(NH4)4Cl2 from ZnO/NH4Cl solutions
|
| 12 |
6,395,242 |
Production of zinc oxide from complex sulfide concentrates using chloride
processing
|
| 13 |
6,391,270 |
Method for removing manganese from acidic sulfate solutions
|
| 14 |
6,361,753 |
Converting zinc chloride to zinc oxide during the hydrometallurgical
processing of flue dust
|
| 15 |
6,352,675 |
Process for removing heavy metals from a caustic fluid stream
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| 16 |
6,340,450 |
Method for leaching zinc concentrate in atmospheric conditions
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| 17 |
6,274,104 |
Non-ferrous metal recovery method utilizing a melt sulphation reaction
|
| 18 |
6,264,903 |
Method for recycling industrial waste streams containing zinc compounds
|
| 19 |
6,241,797 |
Process for reducing oxidic slags
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| 20 |
6,210,647 |
Process of recovery of metals from aqueous ammoniacal solutions employing
an ammonia antagonist having only hydrogen bond acceptor properties
|
| 21 |
6,183,706 |
Autoclave having an agitator with an aerating impeller for high oxygen
transfer rate to metal-containing slurries and method of use
|
| 22 |
6,171,564 |
Process for extraction of metal from an ore or concentrate containing
nickel and/or cobalt
|
| 23 |
6,165,427 |
Method for removal of heavy metals from aqueous solutions using sodium
di-(n-octyl)phosphinate or sodium di-(n-dodecyl) phosphinate
|
| 24 |
6,162,346 |
Process for recovery of zinc from sphalerite containing ores or
concentrates
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| 25 |
6,152,983 |
Method of producing reduced iron pellets
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| 26 |
6,143,259 |
Treatment of pyrite and arsenophrite containing material with ferric
ions and sulfur dioxide/oxygen mixture to improve extraction of
valuable metals therefrom
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| 27 |
6,103,204 |
Selective bioleaching of zinc
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| 28 |
6,083,295 |
Method of processing finely divided material incorporating metal based
constituents
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| 29 |
6,048,506 |
Process for the removal of cationic impurities from a cobalt sulphate
solution
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| 30 |
5,993,757 |
Reoximation of metal extraction circuit organics
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| 31 |
5,951,954 |
Method for manufacturing clear brine fluids from impure zinc feedstock
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| 32 |
5,876,483 |
Method and furnace for disposal of steel-making waste, and operating
method of the furnace
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| 33 |
5,874,055 |
Chloride assisted hydrometallurgical extraction of metal
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| 34 |
5,869,012 |
Chloride assisted hydrometallurgical extraction of metal
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| 35 |
5,858,315 |
Process for the extraction of zinc from sulphide concentrates
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| 36 |
5,851,490 |
Method for utilizing PH control in the recovery of metal and chemical
values from industrial waste streams
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| 37 |
5,814,126 |
Method and apparatus for producing bright and smooth galvanized coatings
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| 38 |
5,770,170 |
Recovery of zinc from sulphidic concentrates
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| 39 |
5,585,079 |
Method for leaching material containing zinc oxide and zinc silicate
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| 40 |
5,484,579 |
Hydrometallurical recovery of copper and zinc from complex sulfide ores
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| 41 |
5,451,382 |
Process and plant for removing lead, cadmium and zinc from dusts
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| 42 |
5,441,712 |
Hydrometallurgical process for producing zinc oxide
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| 43 |
5,332,560 |
Process for the removal of zinc and nickel from copper ammine sulfate
solutions
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| 44 |
5,120,353 |
Hydrometallurgic method for processing raw materials containing zinc
sulphide
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| 45 |
5,091,001 |
Disposal of spent vanadium pentoxide catalyst by vitrification
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| 46 |
5,017,346 |
Process for treating zinc oxide bearing materials
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| 47 |
4,832,925 |
Recovery of zinc from zinc-containing sulphidic material
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| 48 |
4,778,520 |
Process for leaching zinc from partially desulfurized zinc concentrates
by sulfuric acid
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| 49 |
4,705,564 |
Flow-through electrolytic cell
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| 50 |
4,624,704 |
Selective recovery of zinc from metal containing brines
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