Rotary Drum Filters – Division Strips

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 […]

Slaker Control Strategy Using Existing Equipment Controls

Slaker Photo

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 […]

New “SnapShot” Back Pulse Pressure Filter Media Support

“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 […]

Reducing Industrial Carbon Footprint and Energy with FreeFlow-188

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 […]

Recaust Reminder: Pressure Filter Operation

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 […]

How are Dregs Impacting your Operation?

Dregs Carry Over Operational Trouble Shooting Dregs contamination can cause major operational impacts including; poor liquor quality, reduced lime availability, decreased causticizing efficiency, decreased filter-ability in pressure filters and drum filters, increased soda carry-over, increased corrosion to and deterioration of refractory brick lining in the lime kiln and increased total system dead load. In systems […]

Pressure Filter Operational Trouble Shooting

Pressure filtration is used to improve white liquor and weak wash quality in the recausticizing process. There are a few common problems that affect the performance of these filters. McFarlen Engineering has helped many mills “tune” there systems for best results. For additional information and tips to improve pressure filter operation please call our Vancouver […]

Pre-Shutdown Planning For Recaust/Kiln Area

To avoid rush charges and possible shutdown delays: it is important to check inventory and pre-order often overlooked items for the Recausticizing/Lime Kiln Plant White Liquor & Mud Washing Pressure Filters: Pressure Filter Support Tubes – Lead time: 10-12 weeks. GORE ® Filter Socks – Lead time: 4 to 6 weeks. Polypropylene Filter Socks – […]

Pre-Coat Drum Filter Operational Trouble Shooting

A 1% improvement in lime mud solids can save a mill $100,000 per year or more (basis 1,000 T of pulp/day). Reliable and continual operation of the lime mud pre-coat filter is crucial for efficient lime kiln operations.  McFarlen Engineering has compiled a list of common issues to double check when troubleshooting the operation of […]