As part of an overall capacity increase and mill optimization effort, Visy has chosen Veolia's Chloride Removal Process (CRP™) to enhance the recovery cycle at their Tumut Kraft Mill in Australia. Based on HPD® crystallization technology, the CRP System allows removal of non-process elements (NPEs) from precipitator ash while greatly reducing chemical makeup and ash disposal costs.
The CRP System removes the NPEs, mainly chlorides in this case, thereby preventing their accumulation in the recovery cycle. Valuable sodium is able to be recovered in the process, which becomes increasingly important with higher capacity as the chemical makeup costs are greatly reduced. Due to the mill's location, disposal of the ash is cost prohibitive as well as unavailable.
The installation of the CRP System not only increases operational efficiency of boiler by reducing corrosion and frequency of soot blows, it also provides savings in chemical makeup costs and disposal. The system is designed to process 2.5 tons per hour of precipitator ash with performance specified to recover 80% of sodium and remove 97% of the chlorides. It will be supplied as a module and able to be shipped by over-the-road transport. This will reduce field installation time and complexity.
This installation represents more than twenty-five CRP Systems supplied by Veolia to the pulp and paper industry in ten countries.