Problem: In raw wood fiber processing, the fiber is typically contaminated with sand and gravel from transportation during the logging process. As a result, these impurities cause excessive wear to the internal components of the milling machinery. It was necessary to find a low cost efficient method of disposing hazardous materials before size reduction.
Solution: The unique design of the Pulvocron mill’s classification system allows for external separation of components within the product stream and more efficient hazardous materials disposal.
Feed containing hard to grind contaminants enter the Pulvocron’s milling section. After milling, the product is air conveyed into the Pulvocron’s dynamic classifier section. In-spec ground product exits the dynamic classifier and is air conveyed to the product collector. Over-sized material (contaminants in this case) discharge from the Pulvocron via the tailings port and enter the external plenum. Here the contaminants settle into a collection drum or can be pneumatically conveyed to remote collection.
The hazardous material disposal process was developed and tested at the Bepex International Process Development Center using the Bepex Pulvocron air swept pulverizer machine. A variety of grinding plates, air flow rates and classifier speeds were used to determine the most efficient operation. Following successful testing, product samples were sent to the customer for analysis.
Benefits and Results: