Dust Control Handbook for Industrial Minerals Mining and Processing

Figure 6.14. Bag and belt cleaner device. Note the useof a closed system under negative pressure.Although this section describes one particular B&BCD system, there are numerous types that canbe purchased from manufacturers, fabricated in-house by mineral processing plants, or fabricatedby a local engineering firm. One key factor for a system is to be self-supporting so it can beimplemented anywhere along the conveyor belt line. It is more logical to place a B&BCD in theclosest possible proximity to the filling station to eliminate the dust hazards as quickly aspossible. These devices normally need electrical and compressed air to power the cleaning unitand the blow-off nozzles, respectively.One last critical aspect is that a B&BCD must be under sufficient negative pressure to ensure thatany dust removed from the bags or conveyor belt does not leak from the cleaning unit into themill. Refer to Chapter 1—Fundamentals of Dust Collection Systems for the specifics on theHVAC system.Semi-Automated Bag Palletizing SystemsSemi-automated systems use workers in conjunction with an automated system to perform thebag stacking process. These can include a vast array of different setups and types of systems. Inone case, a worker performs the bag stacking task manually, but is assisted by a hydraulic lifttable. This lift table allows the height for stacking the bags to remain constant throughout theBagging 175