A purification method and system for a lithium-extraction dissolving-solution of an aluminum electrolysis waste, the method includes: adding an alkaline mixture to the lithium-extraction dissolving-solution until a pH of the lithium-extraction dissolving-solution reaches a first target pH, and filtering the lithium-extraction dissolving-solution to obtain a first filtrate after performing a first reaction in the lithium-extraction dissolving-solution; the first target pH is 11.512; and adding a decalcification agent and a catalyst to the first filtrate until a pH of the first filtrate reaches a second target pH, and filtering the first filtrate to obtain a purified dissolving-solution after performing a second reaction in the first filtrate, the second target pH being 11.512.

A method for producing a screen body for a screen used in a screw press, which screen body comprises one or more openings on a screen surface, In order to achieve a particularly long service life, it is provided that the screen body is formed by a sintering process and/or an additive manufacturing process, in particular a 3D printing process. Further embodiments include a screen, in particular for a screw press, having a screen body which has openings on a screen surface.

A filter assembly for filtering a fluid used in an appliance for washing laundry or textile articles including a filtering element enclosing an inlet chamber suitable for receiving the fluid; a housing for the filtering element; an outlet chamber defined by a volume between the filtering element and the housing; an inlet through which the fluid is supplied to the inlet chamber; an outlet in fluid communication with the outlet chamber; a cleaning system located within the inlet chamber adapted to remove filtered contaminants from the filtering surface and including a scraper device adapted to be rotated about a rotation axis to remove filtered contaminants from the filtering surface, and to move the removed filtered contaminants away from the inlet chamber; a collection region for collecting the removed filtered contaminants.

The invention relates to a self-cleaning filter (1) for liquids comprising a body (10) that includes a first chamber (20), with an inlet (14) for a liquid to be filtered, and a second chamber (30), with a liquid outlet (33), wherein the two chambers are substantially superimposed and communicating by means of a flat filter medium (40), wherein the first chamber (20) is in communication with a discharge passage (26) for elimination of unwanted material, said discharge passage being closed by a closing element (50) mounted rotatably in the first chamber (20), and wherein at least one scraper element (60) is connected to the closing element (50) and is in contact with the filter medium (40) so that, following rotation, said scraper element (60) can remove any accumulation of unwanted material that has deposited on the filter medium (40) and convey it toward the discharge passage (26).

A filtration unit (100) configured to remove microparticles from a water stream from at least one washing machine (WM) is provided. The filtration unit comprises an inlet (110) configured to deliver a water stream (WS) from at least one washing machine (WM), a water reservoir (120) configured to receive the water stream (WS) from the inlet (110), a separator module (130) fluidly connected to the water reservoir (120), wherein the separator module (130) is configured to separate microparticles (MP) from the water stream (WS) creating a filtered water stream (FWS), and an outlet (150) configured to allow the filtered water stream (FWS) to leave the filtration unit (100). A method for removing microparticles from a water stream is also provided.

A reciprocating lamination spiral solid-liquid separator is provided, including: a support frame, a filter chamber, a spiral shaft and a driving device. The filter chamber is assembled with the support frame. The spiral shaft is mounted on the support frame and passes through the filter chamber. The driving device is mounted on the support frame. Two ends of the filter chamber respectively have a feed port and a discharge channel. The filter chamber includes a first closed movable ring-piece assembly and a second closed ring-piece assembly having a motion state that is inconsistent with that of the first closed movable ring-piece assembly. The first and second closed ring-piece assemblies are stacked alternately to form the filter chamber, and a gasket is disposed between two adjacent closed ring-pieces of one of the closed ring-piece assemblies.

A filtering device and a tableware washing apparatus, the filtering device includes a rotary filter and a drive assembly. The rotary filter includes a columnar filtering screen configured to filter water from a washing process of the tableware washing apparatus; wherein a diameter of an external circle defined by each mesh of the columnar filtering screen is between 0.2 to 0.5 mm. The drive assembly is connected to the rotary filter and configured to drive the columnar filtering screen to rotate relative to contents within the columnar filtering screen at a relative speed of 100 to 1000 r/min, for separating at least a portion of residue on the columnar filtering screen from the columnar filtering screen.

A microplastic filter includes a housing including an inlet configured to receive water. The microplastic filter also includes a fine filter disposed to rotate within the housing and configured to filter residues from the water. The microplastic filter further includes an inside wiper disposed within the fine filter. The inside wiper includes a center post disposed along a rotational axis of the fine filter and a helical curved wall spirally extending between the center post and the fine filter, where the helical curved wall is configured to guide a portion of the water to backflow through the fine filter and force away at least some filtered residues from pores of the fine filter to prevent fouling or clogging of the fine filter. In addition, the microplastic filter includes an outside wiper spirally disposed around the fine filter and configured to dislodge other filtered residues from the fine filter as the fine filter rotates.

An apparatus for wastewater filtration having a barrel, a basket and a screw on a shaft rotating therein for pushing solid in a distinct output. A removable cartridge comprises a cover for the barrel, the cartridge comprising a pre-sealed shaft connector which releasably connects to at least the upper shaft portion or the lower shaft portion to form the shaft. The screw comprises a brush on an outer rim thereof, the brush having radially outwardly oriented bristles that scrape an inner surface of the basket. The screw comprises a winged wiper at a bottom thereof for sweeping a bottom surface of the barrel, and the solid-material output is provided at the bottom surface of the barrel and is shaped as a rectangular opening which is offset from a central axis of the screw. Solid removal efficiency and maintenance are thereby improved.

A microparticles filter device with a housing body, an inlet and an outlet, a filtering chamber housed in the housing body and including a microparticles filter element having a filtering surface on which microparticles accumulate while the liquid flows therethrough; a cleaning device movably arranged in the filtering chamber for removing microparticles that accumulate on the filtering surface towards a storage volume of a collecting chamber arranged at a side of the filtering chamber and in communication therewith, where the collecting chamber is configured to be removably coupled with respect to the housing body and the cleaning device includes at least a portion extending into the storage volume of the collecting chamber thereby providing an extraction aid member to remove the cleaning device from the housing body when the collecting chamber is removed from the housing body.