Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields

Language:

Dates

Publication Date Range:

to

Document Data

Title:

Document Type:

Library

Collection:

Series:

People

Author:

Help
Clear All

Query Builder

Query box

Help
Clear All

For additional assistance using the Custom Query please check out our Help Page

i

Assessment of airborne dust generated from small truck-mounted rock drills

Filetype[PDF-1.35 MB]


  • English
    • Details You May Also Like

    Details:

    • Personal Author:
    • Corporate Authors:
      United States. Bureau of Mines.
    • Description:
      "Recently the United States Bureau of Mines dust research program studied small surface mine drills to assess their dust generation hazards and the effect of dust control technologies implemented. Most of the drills were truck mounted and used Rotoclone dry dust collection systems. Initial dust source surveys and the assessment of dust control enhancements for small mobile rock drills were presented in this report. A significant amount of airborne respirable dust was emitted from the Rotoclone type dust collector. Respirable dust concentrations measured around the drill deck ranged from 8.658 to 95.15mg/m3 with concentrations ranging from 1.37 to 2.69mg/m3 at distances of 12.2 to 30.5 meters downwind. Wind direction and speed were factors in the dust concentrations measured on the bench. Dust collector improvements were made on several drills to control dust from the emission sources. The results showed that adding a low flow of water to the collector exhaust may reduce the dust emitted by 92%, increasing drill deck shroud containment and increasing the Rotoclone speed may reduce respirable dust levels by 63%, vertically extending the Rotoclone exhaust may reduce downwind respirable dust levels by 62%, and enclosing the Rotoclone hopper discharge may reduce levels by 80%. Wet drilling, by injecting small amounts of water into the bailing air, appeared to be more effective than an improved Rotoclone drill deck shroud by 29%. Repositioning the operator away from the drill during most of its operation can keep him or her out of the dust cloud and reduce dust levels by 69%." - NIOSHTIC-2

      NIOSHTIC no. 00233930

    • Subjects:
    • Series:
      Report of investigations (United States. Bureau of Mines) ; 9616
    • Document Type:
      Report
    • Collection(s):
    • Main Document Checksum:
    • Download URL:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at stacks.cdc.gov