Abstract:
A separation system is disclosed for separating selected particles from a mixture of particles in a fluid. The system includes a froth flotation vessel (10) into which in use the mixture of particles and fluid are subjected to an upward flow of an introduced gas to form a froth layer (13) which rises above an interface (14) formed between the froth layer (13) and the mixture of particles and fluid (12), such that a quantity of the selected particles is conveyed out of the vessel (10) by the froth layer (13) to become a first product of the system. The vessel (10) also has a first outlet (29) arranged in use for receiving a flow of some of the mixture of particles and fluid from the vessel (10), an entry to the first outlet (29) being located in a region proximate to, but below, the interface (14). The vessel also has a second outlet (20) arranged in use for receiving a flow of some of the mixture of particles and fluid from a region of the vessel (10) which is located below the first outlet (29). In use the first outlet (29) receives a quantity of the selected particles which were not conveyed out of the vessel by the froth layer (13), and the second outlet (20) receives a quantity of the selected particles in a first by-product of the system. The first by-product comprises a relatively higher percentage of solids compared to the flow of particles and fluid in the first outlet (29). The flow of the mixture of particles and fluid from the(vessel (10) via the first outlet (29) passes to a classification device (31, 76) which separates the flow into two or more fractions on the basis of their size or density or a combination of the two.
Abstract:
A flotation tank (1) comprises a self-supporting tank (2). The tank (2) is made of thermoplastic polymer. The tank (2) has a lower tank part (3) and a tapered upper tank part (4) which is narrower than the lower tank part (3). The tank (2) has a mouth (5) at the upper end of the upper tank part (4) and an overflow lip (6) at the periphery of the mouth (5). The flotation tank (1) further comprises an overflow receptacle (7). The overflow receptacle (7) is made of thermoplastic polymer and connected to the tapered upper part (4) of the tank (2) beside the overflow lip (6) for receiving, collecting and discharging an overflow that overflows from the tank (2) over the overflow lip (6), when in use.
Abstract:
A flotation plant comprises a tank module (1) which includes a self-supporting framework (2) having an inner space (3). The tank module includes at least one flotation tank (4). The flotation tank is disposed in the inner space (3) of the self-supporting framework (2). The tank module is a self-supporting unit capable of being transferable and hoistable as an integral entity. The flotation plant comprises at least two drive units (5) for the rotation of drive shafts (6), each drive shaft (6) being connected to a rotor (7) for mixing and/or forming bubbles in the flotation tank (4). An overflow receptacle (8) is disposed at the level of the upper part of the tank module (1) for receiving an overflow from the flotation tanks (4). The flotation plant comprises an overflow channel (9) which is connected to the overflow receptacle (8) for receiving and conducting the overflow from the over-flow receptacle (8) to a pumping means (10). The over- flow channel (9) is disposed outside the tank module (1).
Abstract:
The present invention relates to a method of optical measurement of parameters of a froth flotation substance (10) involved in a froth flotation process, the froth flotation substance (10) with collector molecules, the method comprising the steps of: adding in a predetermined amount indicator molecules to the froth flotation substance (10), wherein the indicator molecules are adapted for specifically binding to the collector molecules, said binding involving a detectable change of an optical absorption spectrum of said indicator molecules; hereinafter measuring by means of measurement light said optical absorption spectrum; and hereinafter determining from the measured part of the optical absorption spectrum of said indicator molecules an amount or a concentration of residual collector molecules in the froth flotation substance (10). Moreover, the invention relates to the froth flotation substance (10) itself, to a system (1) for executing said method, and to a use of the method and the system for controlling the froth flotation process, e.g., by addition of collector molecules to the froth flotation substance (10).
Abstract:
A sensor (1) including at least one array (10), including a plurality of acoustic transducers (12); a controller (42) for controlling each transducer (12) to be selectively in a generation mode for generating an analysis signal, or a reception mode for receiving an analysis signal, and, for controlling the sensor (1) to perform scans of the at least one array (10), each scan having a plurality of scan steps, such that, during each scan step, at least one transducer (12) is in the generation mode and at least one other transducer (12) is in the reception mode; and, a processor (44) for processing one or more signals receivable from one or more of the controller (42), a transducer (12) in generation mode and a transducer (12) in reception mode to determine at least one characteristic from the one or more signals.
Abstract:
Die Erfindung betrifft ein Verfahren zur Bestimmung der Schaummenge in einem ein Fluid (5) enthaltenden Fluidbehälter (1), insbesondere bei der Herstellung einer Faserstoffbahn, insbesondere einer Papier-, Karton-, oder Tissuebahn, wobei das Fluid (5) freies Gas (8) enthält und über dem Fluid (5) Schaum (7) mit einer Schaumhöhe (7.1) ausgebildet ist, und wobei das Fluid (5) und der Schaum (7) eine Gesamthöhe (6) zu einem Referenzpunkt bilden, mit folgenden Verfahrensschritten: a) Ermittlung der Gesamthöhe (6), b) Bestimmung des Gasgehalts im Fluid (5), c) Messung des hydrostatischen Druckes am Referenzpunkt, d) Berechnung der Schaumhöhe (7.1) oder des Schaumanteils oder des Schaumvolumens unter Verwendung der ermittelten Werte aus den Schritten a), b) und c) als Maß für die Schaummenge (7), e) Beeinflussung der Schaummenge in Abhängigkeit des berechneten Maßes für die Schaummenge auf einen vorgebbaren Wert.
Abstract:
The present invention relates to interface level measurements in a tank or container comprising different material layers and especially to flotation processes which are especially applied in mineral industry. The method according to the invention comprises analyzing material in a container (10) comprising slurry (11a) and/or froth (11b) and/or gas and/or a transitional area between the froth (11b) and the slurry (11a), using at least one probe (12) comprising a plurality of electrodes (12') capable of being in contact with the material (11a, 11b), injecting and measuring currents or voltages through at least two electrodes (12'), and determining the conductivity distribution for the material (11a, 11b) using model based calculations, which comprise reconstruction of a vertical conductivity profile among the material (11a, 11b).
Abstract:
The present invention relates to a methodology to measure floatability of sulphide minerals in froth flotation plants based on density of collector adsorption on different mineral phases on mineral electrodes (2) using three electrode (2) electrochemical impedance spectroscopy (EIS) analysis using different size fraction mineral electrodes (2) as working electrodes (2). The electrode assembly 10 was designed in three parts, mineral-graphite pellet electrode (2), copper wire (4) connection and Teflon body (7) by mixing mineral particles and graphite in the ratio of 2:1. A conductive binder (3) is also added to the mixture to increase the strength of the pellet and the mixture is pressed in a die under 200 kN pressure. Steps of mineralogical analysis of electrodes (2), derivation of a surface coverage 15 calibration curve for different collector concentrations, determination of equivalent electrical circuit model, EIS measurements in a measurement medium and flotation rate constant or copper recovery prediction with respect to collector adsorption, are conducted.
Abstract:
Verfahren zur Gewinnung von metallhaltigen Wertstoffen aus einer metallhaltige Wertstoffe enthaltenden Suspension, wobei eine entsprechende, nach Durchlaufen wenigstens einer Pumpenvorrichtung (2) druckbeladene, mit einem Gas versetzte Suspension über wenigstens eine Zuleitung (3) wenigstens einer Düsenvorrichtung (5) wenigstens einer Flotationszelle (4) zugeführt wird, wobei in der wenigstens einen Flotationszelle (4) die metallhaltigen Wertstoffe abgetrennt werden, wobei die Gasbeladung der die metallhaltigen Wertstoffe enthaltenden Suspension wenigstens teilweise nach Durchlaufen der Pumpenvorrichtung (2) vor Eintritt der Suspension in die Düsenvorrichtung (5) erfolgt.
Abstract:
Apparatus features a container and a transducer. The container is made of a selected material and has a container wall with a selected thickness, and configured to hold a fluid therein. The transducer is configured on the outside of the container wall, and is also configured to provide a standing wave into the fluid. The selected thickness and material of the container wall is chosen to ensure about a 1 /2 wavelength of a desired frequency exists within the container wall, so as to substantially reduce back reflections toward the transducer due to any mismatch in acoustic impedance at the interface between the container wall and the fluid, and so as to substantially maximize the amount of energy delivered to the fluid, thus improving the operating efficiency of the apparatus.