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Launo L Lilja

Bror G Nyman

Valto J Makitalo

Stig-Erik Hultholm

Juhani Lyyra

Raimo Kuusisto

Eero Ekman

Pertti Pekkala

Petri Taipale

Matti E Honkaniemi

Simo A Makipirtti

Helge J Krogerus

Risto M Heikkila

Pekka Juhani Niemela

Timo Saarenpaa

Janne Ollila

Matti O Leiponen

Martti J Jankkila

Lauri A Mustikka

Seppo S Jounela

Mauri J Peuralinna

Pentti O Hokkanen

Timo Saarenp{umlaut Over (aa)}

Pentti J Kaasinen

Lasse J Valli

Veli Keinanen

Pekka Tuokkola

Frans H Tuovinen

Mikko Ruonala

Jussi Vaarno

Tuomas Hirsi

Juho K Makinen

Martti Johannes Jankkila

Raimo J Leimala

Pekka Niemel&auml;

Martti Johannes Jormanainen

Esa Lindell

Jari Tiihonen

Heikki Oravainen

Timo T Koivunen

Sti-Erik Hultholm

John H Relander

Stig-Erik Hulthom

Kalevi J Kunttu

Heikki Teperi

Pasi M&auml;&auml;tt&auml;

Kari Rajainmaki

Jukka F Laulumaa

Timo Nivala

Seppo Jounela

Timo Saarenp&auml;&auml;

Lasse Valli

Vesa T&ouml;r&ouml;l&auml;

Jussi Sipil&auml;

Tuomo Jokinen

Ismo Holmi

Matti Elias Honkaniemi

Risto Markus Heikkila

Bror Göran Nyman

Nils H Hakulin

Mikko Juusela

Jouko Peräaho

Seppo S Jounel

Jussi A Asteljoki

Veli Salmi

Jouko Peraaho

Jouko PERÄAHO

The invention relates to a mixing device and method by means of which two solutions that are insoluble or poorly soluble in each other are mixed together into a dispersion. The device consists of at least three helical bars rotating upwards around a shaft and supported on it, so that the support structures between the shaft and the helical rods are set essentially in a horizontal position. The device and method are particularly suitable for mixing solvent extraction solutions used in the hydrometallurgical recovery of metals to form a dispersion.

Device and method for dispersing two solutions in each other in solvent extraction

The invention relates to a turbine-type high-power impeller, to be used for mixing slurry in hydrometallurgical process reactors. The impeller is formed of at least five blades, each of which blades comprises a front edge, trailing edge, root and tip; the roots of the impeller blades are permanently attached by a joint to the hub or axis of the impeller, so that the front edge of the impeller blade is straight, and the trailing edge is chamfered, in which case the blade is narrowed towards the tip, and the blade is provided with two longitudinal folds arranged in parallel with the front edge of the blade.

Impeller for mixing slurry in metallurgical processes

The invention relates to a mixing reactor for mixing a liquid and pulverous solid, clarification the solution that is formed and discharging the clarified solution from the mixing reactor, in the lower section of which a fluidized bed is formed. The invention also relates to a method for mixing a liquid and pulverous solid into each other in a fluidized bed, for clarification the solution that is formed and for discharging the clarified solution from the mixing reactor.

Method to enhance clarification in a mixing reactor and said mixing reactor

The invention relates to a method for reversing the dispersion formed in the mixing section of liquid-liquid extraction and kept condensed in the separation section and the separated solutions form the rear end of the separation section to flow back towards the feed end of the separation section. The invention also refers to the extraction equipment for implementing the reversed flow.

Method and equipment for liquid-liquid extraction

The invention relates to a method for the controlled separation of a dispersion of two liquids formed in the mixing stage of liquid-liquid extraction into their own phases in the separation section of the extraction. In particular the method and equipment relate to the extraction process used in the recovery of metals. In accordance with the method the dispersion band remaining between the separated phases is dammed up using at least one revert member for said purpose located in the separation section. The equipment according to the invention comprises at least one revert member, which is in turn made up of at least two separate parts.

Method and equipment to control separation of a dispersion liquid-liquid extraction

The invention relates to a method for guiding a dispersion of two liquids formed in the mixing stage of liquid-liquid extraction along the longitudinal axis of the separation section in the feed end of an extraction separation section. In particular the method and equipment relate to the extraction process used in the recovery of metals. In accordance with the method the dispersion to be fed into the separation section is guided so that it spreads evenly over the cross-section of the separation section using a directional member placed so as to obtain a vertical flow. The equipment in accordance with the invention consists of a directional member, which is in turn made up of at least two separate parts.

Method and equipment for guiding dispersion in liquid-liquid extraction

The invention relates to a method for controlling and compressing a dispersion formed in the mixing stage of liquid-liquid extraction. The compression of the dispersion is achieved by reducing the cross-section of the separation section in the direction of flow and by equipping the separation section with a dispersion-damming member. The equipment according to the invention thus comprises a settler, which is essentially trapezoid in shape so that its cross-section is wider at the feed end of the settler and gets smaller towards the rear end of the settler, from whence the separated solutions are discharged from the settler, and the settler is equipped with at least one device to dam up the dispersion. In particular the method and equipment relate to the extraction process used in the recovery of metals.

Method and equipment for compressing a dispersion in liquid-liquid extraction

The invention relates to a mixing apparatus and a method for mixing gas in a closed mixing reactor, which uses gas as a process chemical with a high efficiency and where the content of pulverous solids in the solution is great. The aim is to obtain a flow in the reactor which sucks gas from above the surface of the liquid using rotating mixing devices in the centre of the reactor, and to mix said gas throughout the reactor capacity. The mixing apparatus of the invention comprises at least two mixers located at different heights, and on the same shaft. The upper mixer is equipped with a central plate attached to the shaft, with essentially vertical inner blades rising upwards and downwards and outer vanes directed outwards from the central plate, which are inclined from the horizontal. The lower mixer is equipped with a central plate attached to the shaft with vertical blades located on the outer edge.

Mixing apparatus for mixing gas in a closed reactor

The present invention relates to a froth flotation mechanism located in a flotation cell, comprising a directional element suspended from the lower end of a hollow shaft extending to the lower section of the cell and vertical vanes attached to said directional element, which extend above and below the directional element and horizontally beyond the directional element. The substantially horizontal circular plate of the directional element is symmetrically attached around the shaft at its centre and the outer edge of the central plate is bent downwards to form the lap of the guiding part. The gas spreading plate is located on the inner side of the lap. The flotation cell is comprised of a cylindrical lower section, a middle section located above it in the form of a truncated cone widening upwards, and a cylindrical upper section attached to the top of it.

Flotation mechanism and cell

This invention relates to a cascade-type scrubber, with which the wet scrubbing of the exhaust gas and removal of droplets from the gas can be performed in one and the same scrubber, producing a pure, dropless gas. It is thus essential that the cascade tubing typical of the cascade scrubber and the equipment for droplet removal are combined into a single compact entity, which is formed of several nested chambers.

Compact cascade scrubber for scrubbing exhaust gas

The invention relates to a flotation mechanism ( ) comprising a directional element ( ) and vertical vanes ( ) located in a flotation cell ( ). The directional element is symmetrical and is fixed at the center to the lower section of the hollow shaft of the mechanism. According to the corresponding method, due to the directional element ( ), which is cylindrically inclined downwards from the outer edge the flotation mechanism directs the gas-slurry suspension that is formed in a downward slanting direction towards the side wall of the cell. The mineral suspension rises upwards from the side wall towards the center of the cell, from where the flow is diverted to the edges of the cell and the froth generated is removed from the cell. Using this flotation mechanism enables a powerful agitation, extending throughout the entire mixing zone (I).

Flotation mechanism and method for dispersing gas and controlling flow in a flotation cell

The invention relates to a method for extracting copper in liquid-liquid solvent extraction from aqueous solutions with a high sulphate content, by raising the viscosity of the extraction solution and by dispersing the aqueous solution into drops, achieving a dense drop aggregation. The viscosity of the extraction solution may be raised either by increasing the content of the actual extractant, the extraction reagent, in the extraction solution or by using a diluting agent with a higher viscosity than that of the diluting agent normally used. By raising the viscosity of the extraction solution the mixing durability of the extraction dispersion can be increased and resulting of that the amount of residual drops is decreased. Other advantages are that the extraction solution flow of the extraction process decreases in relation to the flow of the aqueous solution acting as the copper source and that the size of the extraction equipment needed is reduced.

Method for extracting copper from an aqueous solution

In a method according to the invention, a dispersion coming from a mixer part is conducted from downwards to the liquid part of the settler, into the middle part of the feed end, wherefrom it is set to be distributed to inside the settler part, in a closed channel-like space located in the immediate vicinity of the settler along the whole width of the settler and the flow therefrom mainly above the channel-like part towards the rear end of the settler. The method according to the invention is realized by means of an apparatus where an uptake shaft extending from the dispersion mixing tank to the settler opens into the feed end of the settler, from where there are further directed distribution channels towards the settler side edges. The distribution channels are placed in the bottom part of the settler.

Method and apparatus for controllably conducting a solution, obtained from liquid-liquid extraction of two solutions and mixed into dispersion, to a wide settler

The invention relates to a method for adjusting the boundary surface between the two mutually separable solutions in liquid&mdash;liquid extraction at the discharge end of the separation part and for preventing the aeration of the solutions when discharging them from the separation part, so that the overflow height of the settled, lighter organic solution is maintained constant. In order to adjust the boundary surface in between the mutually separable solutions, the overflow height of the heavier aqueous solution is adjusted by conducting the settled aqueous solution from down upwards through tubular elements, in which case the height of these overflow pipes can be adjusted. The aeration of the solutions when discharging them from the separation part is prevented by conducting the solutions into transfer pipes through covered, shaft-like weir boxes that are deeper than the discharge end. The invention also relates to an apparatus whereby the boundary surface between the solutions is adjusted and the aeration prevented.

Method and apparatus for adjusting the boundary surface between two controllably flowing and mutually separable and for conducting both solutions out of the separation part

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Pori, Finland

Launo L Lilja