CLOSURE FOR LEAF FILTER IN ALUMINA PRODUCTION

摘要

An edge closure system is presented herein wherein a portion of the closure edge of the filter bags leading to the outlet pipe aperture are provided with mating snapping closures, allowing to sealingly close the length of the edge of the fabric leading to the outlet pipe aperture simply by engaging the male and female components of the snapping closures. Moreover, an outlet pipe closure system is also presented herein using a combination of a tongue mounted internally to one of the sides of the fabric forming the bag in a manner to be wrappable around at least a corresponding portion of the outlet pipe, and a fabric hood mounted externally and overlapping both sides of the bag at the outlet pipe aperture, which cooperates with the tongue to seal the interface between the outlet pipe and the bag when held in position.

主权项

1. A leaf filter bag for use with a mesh frame in a leaf filter of an alumina production plant, the leaf filter bag comprising:
a first sheet portion adjacent a second sheet portion with a mesh frame spacing therebetween, the two adjacent sheet portions being connected at three closed edges and having a fourth closure edge openable to allow inserting a mesh frame into the mesh frame spacing through the closure edge, one of the edges having an outlet pipe aperture through which an outlet pipe of the mesh frame extends when the mesh frame is in the mesh frame spacing; a male snapping closure made integral to the first sheet portion along at least a portion of the closure edge, and a female snapping closure made integral to the second sheet portion and being complementary to the male snapping closure, the male snapping closure and the female snapping closure being made of EPDM rubber, the male snapping closure being snappingly engageable with the female snapping closure to form a seal along the closure edge and disengageable therefrom to allow removing the mesh frame from the mesh frame spacing; a tongue having a first end secured to one of the sheet portions, adjacent one of the first end and the second end of the of the outlet pipe aperture, and a free second end, the tongue being wrappable around at least a first portion of the outlet pipe; and a hood secured to the filter bag body partially around the outlet pipe aperture, and protruding from the filter bag body, the hood being wrappable around at least a complementary portion of the outlet pipe and cooperating with the tongue when held in position to form a seal between the leaf filter bag and the outlet pipe.