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Method for acidic leaching of lateritic ores
Patents Alert
1040
5575303
5575981
PROCESS FOR CONTROLLING A SERIES OF FLOTATION CELLS
METHOD FOR ACIDIC LEACHING OF LATERITIC ORES
Hulbert David G Johannesburg, SOUTH AFRICA assigned to Mintek
Krause Eberhard Goro Nickel S A
A process for controlling a variable in respect of material in a series of interconnected vessels of a plant includes monitoring a variable in respect of each vessel. The monitored value of the variable is compared with a set point value of the variable. The differences between the monitored values and set point values of the variable resulting from at least one disturbance are summed. When such a disturbance in any one vessel results in a signal representative of the summed value being generated, each of a plurality of actuators of the plant are manipulated in a predetermined direction from the one vessel to cause rapid reduction of the disturbance. The invention extends to a control system for controlling a variable in respect of material in a series of interconnected vessels of a plant.
The invention provides an autoclave configuration for pressure leaching lateritic ores at elevated temperatures. The autoclave configuration includes at least one primary autoclave. The primary autoclave includes a slurry inlet port for receiving slurries of lateritic ore from a latetitic slurry supply, an acid inlet port for receiving leaching acids,an agitation means for agitating the slurries of lateritic ore, and an outer port for removing partially leached slurries of lateritic ore. A multi-compartment autoclave follows the primary autoclave. The multi-compartment autoclave is divided into at least two chambers connected in series. The chambers contain a means for agitating the partially leached slurries and divider walls for separating the chambers. An inlet port is connected to the first of the chambers for receipt of the partially leached slurries. An outlet port is connected to the last of the series of chambers for removal of the finally leached slurries. A bypass conduit is connected to the lateritic slurry supply and the multi-compartment autoclave. The bypass conduit is for periodically isolating the primary autoclave for removal of scale while leaching later-i& ore in the multi-compartment autoclave.
Oakville, CANADA assigned to
5575334 COPPER AND ZINC RECOVERY PROCESS FROM SULFIDE ORES Clough Thomas J Grover Beach, CA, UNITED STATES assigned to Ensci Inc A process for recovering at least one of copper or zinc metal from an ore containing metal sulfide material is disclosed. The process involves the use of promoting amounts of certain plant derived ortho-quinone and/or catechol iron complexes containing components, particularly, certain lignin and/or tannin derived components containing orthoquinone functionality. Preferred compositions comprise at least one ligno-sulfonate component containing orthoquinone and/or catechol functionality. In the process, the use of at least one additional oxidant capable of maintaining the ortho-quinone and/or catechol iron complex containing functionality in the desired oxidation state provides for integrated process synergy.
5577669 APPARATUS AND METHOD FOR THE BENEFICIATION OF ORE AND COAL WITH THE AID OF ULTRASOUND Vujnovic J Bradley Saint Clairsville, OH, UNITED STATES An apparatus for treating a slurry with ultrasound to improve separation based upon specific gravity comprises a plurality of modular conduit units having substantially vertical walls defining a flow space through which a slurry may be pumped. Bach modular conduit unit has mounted thereon ultrasound transducers for transmitting ultrasound energy into the slurry being pumped through the modular conduit unit and meens for exciting the uhrasound transducers in a frequency range of 60 to 100 kH2.
1040
5575303
5575981
PROCESS FOR CONTROLLING A SERIES OF FLOTATION CELLS
METHOD FOR ACIDIC LEACHING OF LATERITIC ORES
Hulbert David G Johannesburg, SOUTH AFRICA assigned to Mintek
Krause Eberhard Goro Nickel S A
A process for controlling a variable in respect of material in a series of interconnected vessels of a plant includes monitoring a variable in respect of each vessel. The monitored value of the variable is compared with a set point value of the variable. The differences between the monitored values and set point values of the variable resulting from at least one disturbance are summed. When such a disturbance in any one vessel results in a signal representative of the summed value being generated, each of a plurality of actuators of the plant are manipulated in a predetermined direction from the one vessel to cause rapid reduction of the disturbance. The invention extends to a control system for controlling a variable in respect of material in a series of interconnected vessels of a plant.
The invention provides an autoclave configuration for pressure leaching lateritic ores at elevated temperatures. The autoclave configuration includes at least one primary autoclave. The primary autoclave includes a slurry inlet port for receiving slurries of lateritic ore from a latetitic slurry supply, an acid inlet port for receiving leaching acids,an agitation means for agitating the slurries of lateritic ore, and an outer port for removing partially leached slurries of lateritic ore. A multi-compartment autoclave follows the primary autoclave. The multi-compartment autoclave is divided into at least two chambers connected in series. The chambers contain a means for agitating the partially leached slurries and divider walls for separating the chambers. An inlet port is connected to the first of the chambers for receipt of the partially leached slurries. An outlet port is connected to the last of the series of chambers for removal of the finally leached slurries. A bypass conduit is connected to the lateritic slurry supply and the multi-compartment autoclave. The bypass conduit is for periodically isolating the primary autoclave for removal of scale while leaching later-i& ore in the multi-compartment autoclave.
Oakville, CANADA assigned to
5575334 COPPER AND ZINC RECOVERY PROCESS FROM SULFIDE ORES Clough Thomas J Grover Beach, CA, UNITED STATES assigned to Ensci Inc A process for recovering at least one of copper or zinc metal from an ore containing metal sulfide material is disclosed. The process involves the use of promoting amounts of certain plant derived ortho-quinone and/or catechol iron complexes containing components, particularly, certain lignin and/or tannin derived components containing orthoquinone functionality. Preferred compositions comprise at least one ligno-sulfonate component containing orthoquinone and/or catechol functionality. In the process, the use of at least one additional oxidant capable of maintaining the ortho-quinone and/or catechol iron complex containing functionality in the desired oxidation state provides for integrated process synergy.
5577669 APPARATUS AND METHOD FOR THE BENEFICIATION OF ORE AND COAL WITH THE AID OF ULTRASOUND Vujnovic J Bradley Saint Clairsville, OH, UNITED STATES An apparatus for treating a slurry with ultrasound to improve separation based upon specific gravity comprises a plurality of modular conduit units having substantially vertical walls defining a flow space through which a slurry may be pumped. Bach modular conduit unit has mounted thereon ultrasound transducers for transmitting ultrasound energy into the slurry being pumped through the modular conduit unit and meens for exciting the uhrasound transducers in a frequency range of 60 to 100 kH2.