For concentrating a fine-particulate special PCC product a BoCross Dynamic Filter with 6 m² filtration area is operated.
The calcium carbonate suspension is fed to the BoCross Dynamic Filter directly after precipitation with a feed concentration of 13 wt.-% (DS-content). In this state the feed suspension has a high viscosity and has to be thickened to an end concentration as high as possible.
The BoCross Dynamic Filter achieves an end concentration of DS = 40 - 43 wt.-%. This end concentration is higher than the solids content of a filter cake (DS = 37 wt .-%), which is formed by pressure filtration at a pressure difference of Dp = 6 bar.
The solids discharged from the BoCross Dynamic Filter completely satisfy the process targets in terms of
- high end concentration
- no air intake
- pastous consistency with spreadable flow behavior.
BoCross Dynamic Filter
|Filter area per unit||[m²]||6|
|Filter drive power||[kW]||30 (installed = 55)|
|Year of commissioning||||2007|
Process and Operation Data
|Specific filtrate throughput||[ l/m² h ]||180 - 200|
|Solids content in feed||[ wt -% ]||13|
|Solids content in retentate||[ wt -% ]||40 - 43|
|Solids content in filtrate||[ g/l ]||Free of particles|
||[ bar, g ]||3|
|Product||Calcium Carbonate - Special PCC Product|
|Medium particle size x50||[ µm ]||<< 1|
|Temperature||[°C]||25 – 30|