Montreal, Canada
Montreal, Canada

Rio Tinto Alcan Inc. is a Canadian company based in Montreal. It was created on November 15, 2007 as the result of the merger between Rio Tinto PLC's Canadian subsidiary, Rio Tinto Canada Holding Inc., and Canadian company Alcan Inc. On the same date, Alcan Inc. was renamed Rio Tinto Alcan Inc..Rio Tinto Alcan Inc. is the global leader of aluminium mining and production, above its one time parent Alcoa , Rusal and some Chinese public companies. Wikipedia.


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Patent
Rio Tinto Alcan | Date: 2015-06-02

A dry scrubbing system and process wherein an acid gas comprising at least one pollutant is modified in a humid zone of a duct such that a relative humidity of between 2% and 90% is achieved. The humidified gas is then contacted with chalked lime in a reaction zone. The reaction zone components are subsequently filtered in a filtering zone to provide a filtered gas having reduced concentration of the at least one pollutant when compared to the initial acid gas.


Patent
Rio Tinto Alcan | Date: 2015-04-09

A screw press for separating liquid from a solid-liquid mixture includes a casing having inlet and outlet sections, and a filter section there between. The filter section includes an axially extending stack of coplanar filtration plates defining a core passage for receiving a screw configured to convey the solid-liquid mixture from the inlet section to the outlet section while compressing and dewatering the solid-liquid mixture by forcing at least part of the liquid content of the mixture to be expelled out of the casing through inter-plate gaps defined between each pair of adjacent filtration plates. The filtration plates are fixed relative to one another and clamped in direct intimate face-to-face contact by a clamping assembly operable for applying a predetermined axially clamping pressure substantially uniformly about the core passage. The inter-plate gaps are controlled by the surface roughness of the plates and the clamping pressure.


Patent
Rio Tinto Alcan | Date: 2015-04-09

A screw press includes a filter casing having inlet and outlet sections and a filter section therebetween. A screw is mounted in the casing for conveying a solid-liquid mixture from the inlet section to the outlet section while compressing the solid-liquid mixture and forcing at least part of a liquid content thereof to be expelled out of the filter casing. The casing and the screw are of modular construction. The filter section has at least first and second serially interconnectable filter sections, and the screw has at least first and second serially interconnectable screw sections respectively disposed in the first and second filter sections for joint rotation as a unitary component. The first and second screw sections have a continuous screw flight having a flight outside diameter. The first and second screw sections are detachably coupled to one another by a coupling provided at the outside diameter of the flight.


Patent
Rio Tinto Alcan | Date: 2017-03-01

A screw press (14) for separating liquid from a solid-liquid mixture, comprises a casing (18) having inlet and outlet sections (24, 26), and a filter section (28) therebetween. The filter section (28) includes an axially extending stack of coplanar filtration plates (36) defining a core passage for receiving a screw configured to convey the solid-liquid mixture from the inlet section (24) to the outlet section (26) while compressing and dewatering the solid-liquid mixture by forcing at least part of the liquid content of the mixture to be expelled out of the casing through inter-plate gaps (40) defined between each pair of adjacent filtration plates (36). The filtration plates (36) are fixed relative to one another and clamped in direct intimate face-to-face contact by a clamping assembly (38) operable for applying a predetermined axially clamping pressure substantially uniformly about the core passage. The inter-plate gaps (40) are controlled by the surface roughness (R) of the plates (36) and the clamping pressure.


Patent
Rio Tinto Alcan | Date: 2015-10-28

A screw press (14) for separating liquid from a solid-liquid mixture comprises a filter casing (18) having inlet and outlet sections (24, 26), and a filter section (28) therebetween. A screw (20) is mounted in the casing (18) for conveying the solid-liquid mixture from the inlet section (24) to the outlet section (26) while compressing the solidliquid mixture and forcing at least part of a liquid content thereof to be expelled out of the filter casing (18). The casing (18) and the screw (20) are of modular construction. The filter section (28) has at least first and second serially interconnectable filter sections (28a, 28b), and the screw (20) has at least first and second serially interconnectable screw sections (20a, 20b) respectively disposed in the first and second filter sections (28a, 28b) for joint rotation as a unitary component. The first and second screw sections (20a, 20b) have a continuous screw flight (34) having a flight outside diameter. The first and second screw sections (20a, 20b) are detachably coupled to one another by a coupling (62) provided at the outside diameter of the flight (34).


This cell (1) comprises a pot shell (2) defining an opening through which an anode block (10) is designed to be moved, said anode block (10) being suspended from an anode support (8) forming with said anode block an anode assembly mobile in relation to the pot shell (2), and a confinement chamber (22) defining a closed volume above said opening for the containment of the gases generated during the production of aluminum, the anode support (8) being connected to an electrical conductor (26) to supply an electrolysis current to the anode block (10), the anode assembly is fully contained in the confinement chamber (22), and in that the electrical connection between the mobile electrical conductor (26) and the anode support (8) is made within the confinement chamber (22).


A settler (201) for decanting mineral slurries comprising a tank (203) having a side wall (205), a bottom (207) and a top (209), an outlet (211) for a thickened slurry at the bottom of the tank, a first overflow outlet (213) for withdrawing an overflow stream of a clarified liquid, a slurry inlet means (215) for introducing fresh slurry into the tank, the slurry inlet means (215) having a slurry opening (261) through which fresh slurry joins a body of slurry in the tank, and a stirrer (217) having a vertical axis (239) around which the stirrer rotates or reciprocates, in said settler the slurry opening (261) is displaced laterally relative to said vertical axis of the stirrer and said slurry inlet means (215) comprises mixing means (251). A separation installation comprising the above settler and a method for separating a clarified liquid from a thickened slurry of a mineral slurry.


A process for producing alumina trihydrate comprising an digestion step (26), a separation step (70), and a precipitation step (52) the separation step including:b1) pretreating a slurry from the digestion step by adding a flocculant to said slurry and mixing the flocculant and the slurry,b2) settling the resulting flocculated slurry in a gravity settler vessel,b3) determining a measured value representative of the concentration of solid particles in the resulting clarified liquor,b4) comparing the measured value with a predetermined threshold,b5) feeding said clarified liquor directly to the precipitation step (52), while the measured value is less than said predetermined threshold, andb6) redirecting said clarified liquor to the pre-treatment step b1), when the measured value is more than said predetermined threshold. An installation for operating said process.


A settler for decanting mineral slurries includes a tank having a side wall, a bottom and a top, an outlet for a thickened slurry at the bottom of the tank, a first overflow outlet for withdrawing an overflow stream of a clarified liquid, a slurry inlet means for introducing fresh slurry into the tank, the slurry inlet means having a slurry opening through which fresh slurry joins a body of slurry in the tank, and a stirrer having a vertical axis around which the stirrer rotates or reciprocates, in said settler the slurry opening is displaced laterally relative to said vertical axis of the stirrer and said slurry inlet means comprises mixing means. A separation installation includes the above settler and a method for separating a clarified liquid from a thickened slurry of a mineral slurry.


Patent
Rio Tinto Alcan | Date: 2015-10-28

A screw press (14) for separating liquid from a solid-liquid mixture, comprises a casing (18) having inlet and outlet sections (24, 26), and a filter section (28) therebetween. The filter section (28) includes an axially extending stack of coplanar filtration plates (36) defining a core passage for receiving a screw configured to convey the solid-liquid mixture from the inlet section (24) to the outlet section (26) while compressing and dewatering the solid-liquid mixture by forcing at least part of the liquid content of the mixture to be expelled out of the casing through inter-plate gaps (40) defined between each pair of adjacent filtration plates (36). The filtration plates (36) are fixed relative to one another and clamped in direct intimate face-to-face contact by a clamping assembly (38) operable for applying a predetermined axially clamping pressure substantially uniformly about the core passage. The inter-plate gaps (40) are controlled by the surface roughness (R) of the plates (36) and the clamping pressure.

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