[12] Patent
[11] Patent No.:GC0010827  
[45] Date of Publishing the Grant of the Patent: 1/Jun /2020                63/2020  
Number of the Decision to Grant the Patent:2020/163197
Date of the Decision to Grant the Patent:13/Feb/2020

[21] Application No.:GC 2015-29257

[22] Filing Date:20/4/2015

[30] Priority:

[33] State [32] Priority date [31] Priority No.

[72] Inventors:1- Alain BOIVIN،2- Marie-Louise BOUCHARD،3- Guy SIMARD،4- Véronique SAVARD،5- Simon GRAVEL

[73] Owner: RIO TINTO ALCAN INTERNATIONAL LIMITED, 1188 Sherbrooke Street West, MONTREAL - QUEBEC H3A 3G2, Canada

[74] Agent: Abu-Gazaleh Intellectual Property L.L.C




Int. Cl.: B01D 29/46 (2006.01)

[56] Cited Documents:

-CN 202490487 U (CUN JIANG et al.) 17 October 2012
-JP 3159378 U (MAKATO HASEGAWA) 20 May 2010
-CN 101584948 A (XINXIANG WANG) 25 November 2009
-CN 103920323 (WUANG FEI et al.) 16 July 2014
Examiner: Eng. Fahad M. AlBaker

[57] Abstract: 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.Fig. 1
No. of claims: 21     No. of figures: 6


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