The invention relates to an improved flotation cell design for the mining industry. The flotation cell includes a cylindrical froth flotation unit 52 and a unique hexagonal overflow froth launder 84. The design optimizes the froth flotation process and allows for the economical utilization of the honeycomb packing arrangement of cells.

Eine Flotationseinrichtung dient der Entfernung von Farb- und Schmutzpartikeln aus Faserstoffsuspensionen, die bei der Altpapieraufbereitung hergestellt werden. Die Luftzumischung erfolgt in Stufendiffusoren (5). Die mit Luft vermischte Suspension wird vor Einlauf in den Flotationsbehälter (1) durch ein als Prallmischer wirkendes Umlenkteil (11) mit sich anschließendem Mischdiffusor (12) geleitet, wobei in Letzterem eine Strömungsrichtung bevorzugt wird. Die erfindungsgemäße Flotationseinrichtung eignet sich besonders gut für die Ausscheidung von Störstoffen, die in einem relativ breiten Korngrößenspektrum vorliegen. Besonders günstige Ausführungsformen verwenden geschlossene Flotationsbehälter, bei denen die aus dem Schaum (9) austretende Luft mit Vorteil wieder zum erneuten Belüften verwendet werden kann.

This invention pertains to a multi-stage separator vessel through which the to-be-cleaned fluid flows. Aeration assemblies within the inner cells disperse micro-fine gas bubbles into the fluid for cleaning purposes. Additionally, the inlet piping contains a separator that begins the separation process before this fluid is discharged into the first cell. An L-shaped passageway interconnects the various flotation cells of this separator with the entrance of each such passageway being at an elevation below its exit. A weir is located within each flotation cell that is adjustable as needed. This weir empties into a channel alongside the separator vessel that collects the separated contaminants flowing over the weir for later disposal.

Froth flotation apparatus for separating contaminant particles from liquid suspension stock, e.g. in the de-inking of used news print, includes a cell comprising inner (24) and outer (25) annular chambers of substantially equal depth. The inlet (40) and outlet (54) connections for the stock are located adjacent the bottoms of the two chambers to force the stock to travel through the full depth of each chamber. A baffle (27) of substantial width is provided on the top of the wall between the two chambers to spread the stock overflowing that wall into a thin film. Sparger means (30) mounted in the bottom wall (23) of the outer chamber (25), such as an explosion-type flowbox (32), is employed to aerate the stock as it is delivered to the froth flotation apparatus.

A waste paper de-inking system of this invention agitates and mixes waste paper dissolving slurry (5) and treating gas (7) by a multi-stage type vapor-liquid mixer (3) before a floatator treating step, separates and finely pulverized ink and sticky matters adhered to fiber in the waste paper dissolving slurry (5) and sufficiently absorbs and contains the treating gas (7) in the slurry before reaching to the lower most stage to facilitate de-­inking operation in later floatator (13). Further, a high tower multi-stage vapor-liquid mixer (3) can be utilized also as a floatator (13) to reduce a required floor area and required power consumption of the system.

Further, high temperature exhaust gas containing SO₂ produced in a factory is utilized as the treating gas to perform various operations, such as desulfurization, heat recovery, bleaching and also purification of a factory environment, thereby too much economical waste paper de-inking system is provided.

Apparatus for froth flotation comprising a flotation tank having a series of cells separated by partitions but having a communicating common bottom sloped towards the feed end of the tank under all the cells. A method for froth flotation employing the novel apparatus is also disclosed.

@ An improved method and apparatus for froth flotation separation of the components of a slurry, having particular utility for the beneficiation of coal by the flotation separation of coal particles from impurities associated therewith, such as ash and sulfur. In this arrangement, a forward product stream is formed in which a mixture of the particulate matter slurry and the chemical reagents is sprayed through a nozzle at a first relatively low pressure onto the surface of water in a forward stream flotation tank to create a floating froth phase containing therein a first quantity of the particulate matter. The remainder of the particulate matter slurry separates from the froth phase by sinking in the water, and the froth phase is separated as a first product. The remainder of the particulate matter slurry is then directed to a scavenger product stream in which the separated slurry is sprayed through a second nozzle at a second higher pressure onto the surface of water in a second scavenger stream flotation tank to create a floating froth phase containing therein a second quantity of the particulate matter. The second froth phase is then separated as a second product. The amounts of the products recovered in the first and second product streams are substantially independently adjustable by controlling the first and second spraying pressures.

57 An improved method and apparatus for froth flotation separation of the components of a slurry, having particular utility for the beneficiation of coal by the flotation separation of coal particles from impurities associated therewith such as ash and sulfur. In this arrangement, a forward product stream is formed in which a first quantity of chemical reagents is mixed with the particulate matter slurry. The treated particulate matter slurry is then sprayed through a nozzle onto the surface of water in a forward stream flotation tank to create a floating froth phase containing therein a first quantity of the particulate matter. The remainder of the particulate matter slurry separates from the froth phase by sinking in the water, and the froth phase is separated as a first product. The remainder of the particulate matter slurry is then directed to a scavenger product stream in which an additional quantity of chemical reagents is mixed with the remainder of the separated particulate matter slurry. The mixture is then sprayed through a second nozzle onto the surface of water in a second scavenger stream flotation tank to create a floating froth phase containing therein a second quantity of the particulate matter. The remainder of the particulate matter slurry separates from the second froth phase by sinking in the water, and the second froth phase is then separated as a second product. The amounts of the products recovered in the first and second product streams are substantially independently adjustable by controlling the amounts and types of chemical reagents added in each stream.

Es wird in einem Apparat (10), dessen Eintrittsöffnung (17) für die in einer Schaumrinne (22) einer Primär-Flotationsanlage (20) vorhan­dene, geschäumte Flüssigkeit im Boden der Schaumrinne vorgesehen ist, von seinem unteren Bereich ausgehend mit einer Rezirkula­tions-Flüssigkeitsmenge der Sekundär-Flotationsstufe (30) in dem gesamten Apparat - ausgenommen höchstens dessen Oberteil (3) - eine Rotationsströmung (Potentialwirbel) erzeugt, in deren Kern sich die leicht durch ein Abzugsrohr (4) abzuführende Gasmenge (Luft) sammelt. Dadurch erhält die Pumpe (35), die die geschäumte Flüssigkeit von der Schaumrinne (22) der Primär-Flotationsstufe (20) zu den Zellen der Sekundär-Flotationsstufe (30) führt, wenig Gas­anteile im Verhältnis zur Flüssigkeits-Gesamtmenge.

57 An improved method and apparatus for froth flotation separation of the components of a slurry, having particular utility for the beneficiation of coal by the flotation separation of coal particles from impurities associated therewith such as ash and sulfur. In this arrangement, a forward product stream is formed in which a first quantity of chemical reagents is mixed with the particulate matter slurry. The treated particulate matter slurry is then sprayed through a nozzle onto the surface of water in a forward stream flotation tank to create a floating froth phase containing therein a first quantity of the particulate matter. The remainder of the particulate matter slurry separates from the froth phase by sinking in the water, and the froth phase is separated as a first product. The remainder of the particulate matter slurry is then directed to a scavenger product stream in which an additional quantity of chemical reagents is mixed with the remainder of the separated particulate matter slurry. The mixture is then sprayed through a second nozzle onto the surface of water in a second scavenger stream flotation tank to create a floating froth phase containing therein a second quantity of the particulate matter. The remainder of the particulate matter slurry separates from the second froth phase by sinking in the water, and the second froth phase is then separated as a second product. The amounts of the products recovered in the first and second product streams are substantially independently adjustable by controlling the amounts and types of chemical reagents added in each stream.

Die vorliegende Erfindung betrifft ein Verfahren zur Flotation wobei die zu flotierende Mischung (Trübe) in einer Flotationszelle in Trichterdüsen, bei denen in der Achse des Treibstahls ein kegelförmiges Umlenkelement angeordnet ist, mit Gas, vorzugsweise Luft, vermischt wird.

It has been discovered that a mechanical flotation system (10) having only two cells (18, 20) can be nearly as efficient as one having more cells, yet provide an apparatus with a considerably smaller footprint, significantly reduced capital and operating costs, as well as be resistant to floating oil recovery platform wave effects. The dual-cell mechanical flotation system (10) has, in sequential order, an inlet chamber (16) and two gasification chambers or cells (18, 20), each with at least one gas ingestion and mixing mechanism (32), and a discharge chamber (24). A common primary skim collection channel (40) atop the partition (44) dividing the gasification chambers (18, 20) efficiently channels away the bulk of the floating collected matter. At least one baffle (60) depending from the top of the vessel (12) near the primary skim collection channel (40) helps dampen the action of the fluid containing the suspended matter when the vessel (12) is affected by wave motion against the floating oil production platform. The liquid or froth levels (50, 66, and 76) can be intermittently raised for collection or otherwise lowered during periods of excessive turbulence (e.g. pitch or roll) to prevent clarified liquid from being collected with suspended matter.