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Closure for leaf filter in alumina production

A leaf filter and closure technology, applied in the field of filter bags of leaf filters, can solve the problems of labor consumption, fabric waste, yield loss, etc.

Inactive Publication Date: 2016-01-20
SEFAR BDH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These vanes are then shut down for the remaining 4 to 6 weeks of operation of the leaf filter, resulting in lost production and wasted fabric
In addition, the process of changing the fabric bag is labor intensive, especially the large amount of fouling that needs to be removed to be able to remove the steel frame from the used bag

Method used

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  • Closure for leaf filter in alumina production
  • Closure for leaf filter in alumina production
  • Closure for leaf filter in alumina production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] refer to image 3 It is known to adopt a square fabric piece of suitable size to be folded in half along the first longitudinal edge 10 to form the first closed edge 10a to make the leaf filter bag 11. It is also known to permanently close the second longitudinal edge 12 and one of the transverse edges (referred to herein as the distal edge 14) by sewing or heat welding, which is typical practice in fabric factories. Thereafter, a bag is formed having two adjacent sheet parts with a frame spacing between them. The bag has three closed edges 10a, 12, 14 and one open edge (which may be referred to as the proximal edge 16), in the aluminum oxide production plant screen frame ( figure 2 ) can be inserted into the open edge.

[0026] Thereafter, sealing is performed along the proximal edge 16 and the outlet tube 18 in the alumina production plant. Closing of the proximal edge 16 is typically accomplished by crumpling the fabric along the portion of the proximal edge 16 e...

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PUM

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Abstract

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.

Description

technical field [0001] The present invention relates to the field of alumina production and, in particular, to filter bags for leaf filters used in the Bayer process. Background technique [0002] In 2012, global alumina production reached and exceeded 70,000,000 metric tons. Alumina, also known as bauxite, is primarily used as a raw material in the production of aluminum metal. The main source of alumina is the ore known as bauxite, which generally contains between 25% and 75% alumina by weight. The ore cannot be directly used by the furnace, and the alumina content must be increased to 99% by weight. The use of the Bayer process to increase alumina content is well known. In a typical application, bauxite is ground, mixed with a solution containing 200-300 g of sodium hydroxide per liter, and heated under pressure at temperatures above 140°. Under these ore dissolution conditions, aluminum compounds are dissolved while iron oxides, titanium oxides and other typical impu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D29/39C22B21/00
CPCB01D29/39B01D29/27B01D35/30
Inventor 卢克·佩伦特彦·布洛初
Owner SEFAR BDH