Dust collectors for roof bolting machines generally use a dry box to collect the roof bolting material. Recently, an underground mining operation converted a dry box dust collector to a wet box dust collector with a unique exception from MSHA for testing purposes. Water is routed to the roof bolter from the main water line of the continuous miner. The wet box utilizes a water spray to wet the incoming material. Testing was conducted comparing the two different collector types. Respirable dust concentrations surrounding the roof bolter with the different collection boxes were similar. The main difference in respirable dust concentrations occurred when cleaning the dust boxes. The average respirable dust concentration during cleaning of the wet box was 0.475 mg/m3, and during the cleaning of the dry box the average respirable dust concentration was 1.188 mg/m3. The silica content of the roof material was high, ranging from 28.9% to 52.7% during this study. The results from this study indicate that using the wet box as a collector reduced exposure to respirable dust up to 60%when cleaning the collector boxes.
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机译：屋顶螺栓机的除尘器通常使用干箱收集屋顶螺栓材料。最近，地下采矿操作将干箱除尘器转换为湿箱粉尘收集器，具有来自MSHA的独特例外，用于测试目的。水从连续矿工的主要水线路由到屋顶螺栓。湿盒利用水喷雾来润湿入射材料。进行比较两种不同的收集器类型进行测试。屋顶螺栓与不同收集盒周围的可吸入粉尘浓度相似。清洁灰尘盒时，可吸入粉尘浓度的主要差异。湿箱清洁过程中的平均可吸入粉尘浓度为0.475mg / m 3，并且在清洁干箱期间，平均可吸尘浓度为1.188mg / m 3。该研究期间，屋顶材料的二氧化硅含量高，从28.9％到52.7％。本研究的结果表明，在清洁收集器箱时，使用湿盒作为收集器的收集器降低至60％的可吸入灰尘。
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