The present patent application describes a stirrer comprising a combination of at least one axially-conveying element and at least one radially-conveying element relative to the rotary shaft of the stirrer wherein the largest diameter of the at least one axially-conveying element is equal to or less than the inner diameter d.sub.i of the radially-conveying element. In one embodiment the stirrer according to the invention is a combination of one anchor stirrer with at least one inclined-blade stirrer. Furthermore the use of the stirrer according to the invention for the culture of cells in a dialysis method is described.

A rotary machine for mixing, pumping or agitating a fluid includes an impeller for acting on the fluid, a drive unit for rotating the impeller around a rotation axis, a drive shaft connecting the impeller with the drive unit, a mounting flange for fastening the rotary machine to a wall of a vessel, and a support structure for supporting the rotary machine, the support structure comprising at least one leg, each leg extending in a vertical plane from a first end along a longitudinal axis to a second end, each leg including an outer member and an inner member coaxially arranged in the outer member, and the inner member slidingly movable relative to the outer member for adjusting the length of the respective leg. In addition, a method of mounting a rotary machine for mixing, pumping or agitating a fluid to a wall of a vessel is proposed.

A device and a method for adjusting stirring blades on a stirring blade receptacle of a stirrer, wherein the stirring blades can be fixed with a stirring blade axis in receiving bores, which are arranged transversely to an axis of rotation and are a part of the stirring blade receptacle, at intended predetermined angle of attack relative to a virtual plane that is arranged transversely to the axis of rotation of the stirrer. An associated device body is provided with a receiving element for receiving the stirring blade receptacle with unfixed stirring blades. A stop is arranged on the device body for each lower face, which faces the receiving element and is a part of the stirring blades, outside the respective stirring blade axis. Each respective stirring blade is then brought into abutment against its associated stop, to place it into the predetermined angle of attack.

The present invention relates to a method for flocculating and dewatering oil sands fine tailings. Said method comprises mixing the aqueous mineral suspension with a poly(ethylene oxide) (co)polymer to form a dough-like material. The material is then dynamically mixed in an in-line reactor to break down the dough-like material to form microflocs having an average size of 1 to 500 microns, and to release water. The internal diameter of the in-line reactor is at most five times the internal diameter of the inlet pipe of the reactor. The suspension of microflocs has a viscosity of at most 1000 cP and a yield stress of at most 300 Pa.

A paint container lid assembly for a standard paint container includes an opening with a threaded adapter ring and a removable threaded cap. A pour spout/funnel includes a tubular lower portion having an internally threaded end to removably engage the adapter ring. The upper portion of the spout/funnel comprises a coffer-like body having an elongated opening. A spout/funnel cap is slidably secured to the spout/funnel to close the entire spout/funnel upper opening or partially unblock the opening to meter and control the rate of outflow of paint.

An axial impeller has blades formed from sheet metal blanks that are configured from taking a desired impeller blade and mathematically “unwinding” the blade to its flat counterpart. Preferably, the impeller blade is formed from a single rolling operation. The result of a thin, elongate blade, preferably having a trailing edge that defines a helix with rearwardly skewed, forwardly raked blades, provides an efficient impeller having good anti-ragging properties.

A stirrer having a motor; a hollow shaft that is drivable via the motor and is provided with at least one additive outlet opening, via which an additive passed through the hollow shaft can be discharged; and a rotor arranged on the hollow shaft and having rotor blades, characterized in that a second rotor having rotor blades is provided on the hollow shaft at a distance from the first rotor, and in that the at least one additive outlet opening is provided between the two rotors, wherein the rotors are designed and drivable such that, during operation, a negative pressure and a centrifugal force are generated in the intermediate space defined between the rotors.

An impeller blade formed of a central base portion having a center axis. At least a pair of impeller blades is extended outwardly from the central base portion, with each impeller blade further including an extension. A leading edge is formed on each of the impeller blades, with each leading edge being defined by an outer periphery of the central base portion, and each leading edge having at least a portion that forms a continuous curve with a radius decreasing outwardly toward a radial tip of the corresponding impeller blade, wherein the continuous decreasing radius curve of each leading edge is formed by a portion of an ellipse centered on the center axis, a short axis of the ellipse being equal to a long axis thereof divided by approximately three and one-half. Each blade extension is projected from the corresponding impeller blade opposite of the leading edge.

The stirring device, in particular for a fluid-mixing bioreactor, comprises a drive shaft including a rod, an agitating element and a sleeve of tubular shape. The sleeve forms a coupling sleeve receiving the shaft therethrough and is directly rotationally coupled to the rod. The agitating element, which has a hub with an annular side wall delimiting an inner space and an impeller assembly comprising blades, is indirectly rotationally coupled to the rod via the sleeve that is engaged in the inner space. One of an inner surface of the wall and an outer surface of the sleeve is a guiding surface with progressively reduced cross section. Axial movement between the hub and the sleeve is prevented in a locked configuration of a sleeve fastening arrangement. Hub-sleeve contact areas can be axially distributed.

The stirring device, in particular for a fluid-mixing bioreactor, comprises a drive shaft including a rod, an agitating element and a sleeve of tubular shape. The sleeve forms a coupling sleeve receiving the shaft therethrough and is directly rotationally coupled to the rod. The agitating element, which has a hub with an annular side wall delimiting an inner space and an impeller assembly comprising blades, is indirectly rotationally coupled to the rod via the sleeve that is engaged in the inner space. One of an inner surface of the wall and an outer surface of the sleeve is a guiding surface with progressively reduced cross section. Axial movement between the hub and the sleeve is prevented in a locked configuration of a sleeve fastening arrangement. Hub-sleeve contact areas can be axially distributed.