Author Archives: McFarlen Engineering

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 […]

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. […]

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 […]

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 – […]

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 […]