In mining operations across North America, efficient rotary disc filter media is essential for tailings dewatering, concentrate filtration, and maximizing water recovery. Abrasive slurries, high solids content, and demanding chemical environments put extreme stress on traditional filter bags, leading to frequent replacements, downtime, and suboptimal cake moisture. McFarlen Engineering Ltd. designs and manufactures high-performance disc […]
08
Jul
Jul
Reducing turbidity in the liquor from green, white, and mud washing clarifiers is crucial for improving the operation of the Recaust Plant. Many pulp mills have increased the loading on their clarifiers to meet greater demands for liquor in the digesters. However, hydrodynamic modeling has shown that older technology for feedwell and bustle pipe design […]
01
Sep
Sep
McFarlen Engineering’s SnapShot pressure filter supports eliminate filter media pinching
24
Jun
Jun
“SnapShot” is a new and unique concept for filter media support, designed to replace old standard pressure filter tubes. It is engineered to reduce maintenance and downtime, improve pressure filter performance, extend sock life, and limit acid washing frequency. Over the years, pressure filter tubes have become longer, heavier and more cumbersome, making them difficult […]
15
Jun
Jun
Rotary drum pre-coat filters are widely used in the Pulp and Paper industry to de-water lime mud before calcining in the Lime Kiln. Holes often form in the filter media over time and can cause equipment damage, process upsets and dead-load accumulation. Holes in filter media can be caused by several different mechanisms. A common […]
08
Jun
Jun
Slaker operation is critical to maintaining white liquor quality, reduced system dead load, and stable pressure filter operation. Recently a mill was experiencing regular over liming events causing unnecessary area and mill down time. Frequent acid washing was required to maintain filter operability. To reduce over liming excursions, weak white liquor was being produced causing […]
23
May
May
“SnapShot” *, is a new and unique concept for filter media support designed to replace old standard pressure filter tubes. It is engineered to reduce maintenance and down time, improve pressure filter performance, extend sock life, and limit acid washing frequency. Over the years, pressure filter tubes have become larger, heavier and more cumbersome, making […]
20
Jun
Jun
With increased focus on industrial carbon footprint, mills must start looking for simple and effective ways to reduce carbon output. Evaporating water from lime mud is a very energy intensive and important step in the lime kiln and calcining process. Providing the kiln with a stable, dry mud will improve energy consumption and lime product […]
27
Aug
Aug
McFarlen Engineering Ltd. has prepared this “Recaust Reminder” to provide operational suggestions to its customers. Please contact us should you have any questions or require further information. Many kraft pulp mills in Canada and the USA operate white liquor and/or lime mud washing pressure filters. Filtration is accomplished by passing the liquid through filter socks that are […]
27
Aug
Aug
Lime slaking is a pivotal operating step in the recausticizing plant. This is where dry meets wet and not only is the cooking liquor reformed, but also where the lime mud slurry is created. The Slaker is responsible for ensuring proper lime and green liquor contact time and mixing and should take about 20 minutes. […]
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