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Dust Control Handbook for Industrial Minerals Mining and Processing RI 9689 REPORT OF INVESTIGATIONS/2012 Chapter 10: Haul Roads, Stockpiles, and Open Areas

Authors:
  • Centers for Disease Control, Pittsburgh Mining Research Division
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Article
While various types of equipment are used in bulk material processing plants to control respirable dust, the equipment often doesn't adequately protect workers. One cost-effective way to supplement your existing dust control equipment is to install a whole-plant ventilation system. This article outlines research by the National Institute of Occupational Safety and Health (NIOSH) on using whole-plant ventilation in two mineral processing operations to reduce respirable dust levels. Information also covers how to design a ventilation system for any bulk material processing plant.
Article
CONTENTS: HOW WIND EROSION OCCURS; FACTORS AFFECTING WIND EROSION; WIND EROSION EQUATION; PRINCIPLES OF CONTROL; CONTROL ON DRYLAND CULTIVATED SOILS; CONTROL ON IRRIGATED LANDS; CONTROL ON VEGETABLE AND SPECIALTY CROPLANDS; CONTROL ON GRAZING LANDS; CONTROL ON SAND DUNES AND OTHER PROBLEM AREAS; PRECAUTIONS.
Article
A method is being investigated to guide the drill steel in place in order to eliminate the increased exposure. Three days of testing was performed to evaluate the effectiveness of the unidirectional flow filtration and pressurization system. A sampling rack was positioned inside the enclosed cab, immediately behind the head of the drill operator. The sampling rack was composed of two gravimetric dust-sampling packages and a pDR instantaneous dust sampler. The personal Data RAM used in the study was a real aerosol sampler that measured a relative respirable-dust concentration based upon the light scatter of particles in an internal sensing chamber. It was observed that the drill operators respirable-dust exposure was significantly increased during periods when he opened the cab door to manually guide an additional drill steel into place.
Article
An innovative loading chute system has been designed at Cleveland Cascades to effectively handle bulk materials. The loading chutes were especially designed to reduce degradation and segregation as well as improve dust control. Development of the chute from model test work to prototype and full-scale operation took two years. Over 70 chutes are now in operation for shiploading, silo filling, road and train loading, and in conveyor transfer chutes, while requirements vary from dust control to avoidance of degradation or segregation.
Article
The factors which should be considered to ensure optimal spray system performance for dust suppression are discussed. The basic methods to achieve dust control, wet dust-suppression spray systems increase humidity/moisture content in the product stream, helping to minimize dust overall and prevent it from becoming airborne. In addition to drop size, effective spray system performance and dust suppression depend upon such characteristics as drop distribution, drop velocity, spray pattern, and spray pressure. The nozzle manufacturer should be consulted for information about drop size and drop distribution at various operating pressures.
Article
Common plant occurrences can raise bag operator's dust exposure over the standard baseline. When bag operators at five different mineral processing plants were monitored to determine their dust exposure levels throughout the workday, a number of different background dust sources were identified that made their dust exposure significantly higher than from the fill process itself. For bag operator exposure to remain within acceptable dust levels established by the Mine Safety and Health Administration (MSHA), the significance of these background sources must be realized, identified, and controlled.
Article
The two most commonly used ventilation methods in dust control systems are dilution ventilation and local exhaust ventilation. Dilution ventilation controls dust by diluting the contaminant concentration with clean air after the contaminant passes through the worker's breathing zone. The method requires a large volume of makeup air becaUse it evenly exhausts a relatively large volume of air from the workplace. Local exhaust ventilation uses dust capture hoods at the point where contaminants are generated to capture the dust at its source, thus minimizing the worker's exposure to high contaminant concentrations. This method requires less air volume than dilution ventilation, providing effective contaminant control at the least possible capital cost.