Treatment of bleach plant filtrations using a magnesium filter

Details Treatment of bleach plant filtrations using a magnesium filter Treatment of bleach plant filtrations using a magnesium filter

1993-03-15

1994-11-01

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 37, 162 42, 162 43, 162 44, 162 60, 162 65, 162 78, 210758, 210912, 210928, D21C 1100

Patent

active

053605144

ABSTRACT:
In the bleaching of paper pulp without chlorine, such as using an OTZE or OZP bleach sequence, filtrate from subsequent stages is used as a wash liquid in preceding wash stages. The filtrate is treated with a fiber filter, and then passes through a magnesium filter, which has magnesium chips with a maximum dimension of about 3 mm or less. The magnesium removes heavy metal ions, and if any of the magnesium dissolves in the filtrate it provides a beneficial affect on the pulp. The pH of the filtrate is typically maintained in the 2-6 range to facilitate dissolution of Cu, Mn and Fe while the magnesium stays out of solution. Two filters may be provided in parallel so that if one becomes contaminated the other may be quickly put into service, and any explosive gases from the magnesium filter are vented.

REFERENCES:
patent: 4543155 (1985-09-01), Stawick
patent: 4568420 (1986-02-01), Nonni
patent: 4761238 (1988-08-01), Hynninen
patent: 4946556 (1990-08-01), Prough
patent: 5164044 (1992-11-01), Griggs et al.
Murray "A Sacrificial Metal Corrosion Control Process"; Water & Sewer Work, Jan. 1966 pp. 19-26.

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