Mines and quarries are very dusty places. Based on data from installations, it's been estimated that as much as 1% of mining throughput can be lost to the surrounding environment. For a 700 TPH quarry, that's about seven tons per hour lost from conveyors, crushers and screens, and that does not include losses from stockpiles.
With mines and quarries under pressure from two directions this is not good news.
Good dust control is essential in meeting both environmental and occupational types of requirements.
Donaldson Torit® advanced-technology cartridge dust collectors and a variety of filter media that conquer the challenges of most types of industrial dusts, including pharmaceutical, chemical, grain, bulk/powder, food, metal and others.
The best-in-class Downflo® Evolution (DFE) dust collector is capable of reducing equipment size and number of required filters by up to 40% compared to a typical cartridge collector.
The high performance Downflo® Oval (DFO) family of dust collectors provides up to 25% more filtration capacity than other same-sized cartridge collectors.
Downflo® WorkStations are flexible, modular, self-contained collectors that allow worker movement and visibility, specifically designed for areas of dirty and/or noisy operation.
Torit® PowerCore® dust collection technology use proprietary Ultra-Web nanofiber technology, which allows for a smaller, more efficient filter, reducing the overall footprint of the dust collector.
Extremely small but powerful package that handles high airflow, high grain loading, challenging particulate, and fits into the smallest places.
The following is a list of some of the typical areas at mines and quarries generating dust that can be controlled by dust collection equipment:
Years of experience in mining and quarry dust control has highlighted a number of significant points:
Good Design and Equipment Selection Is Essential
Anything marginal in either design or selection results in immediate or short term inadequacies in collector performance. The difference in selections between an effective and ineffective dust collector is often much narrower than in many other industries.
Everywhere That Material Is Supposed to Drop Through Air, Dust Is Generated
The most obvious dust generation points may seem to be conveyor transfer points and feed points from screens and crushers. But often, oversized feed-outs from screens or transfer of large product into bins will generate significant dust.
Budgetary constraints are important, so it is generally better to do some parts right than a lot of parts wrong.
Dust Collectors Philosophy: Source or Central
Two basic strategies exist for applying dust control to mines and quarries; source collection (putting the dust collector at the source of the dust emission so collected dust can be deposited directly back into the process stream) or centralized collection (putting the collector in a central location where dusty air is ducted to the collector and discharged as a separate process stream).
Source Collection Operational Advantages Include:
The following points need to be considered in the selection of central dust collectors for mining and quarrying applications:
Source collection systems may be easier to deal with since hoppers and ducting are often not used. But when using source collection, the following should be considered:
Donaldson offers many filtration options for the mining industry.