Preliminary Control Technology Assessment of Ozark Lead Company, Sweetwater, Missouri, Report No. CT-111-14A.
NIOSH 1981 Aug; :1-5
A visit was made to the Ozark Lead Company to investigate control measures used in full lead ore beneficiation. Possible hazardous substances to which these workers could be exposed include lead (7439921), silica (7631869), nuisance dusts, and flotation reagents. The facility processed about 6,000 tons of crude ore per day. A cascade type crushing facility reduced the ore to less than 5/8 inch. A continuous belt conveyor carried the ore to the concentrator fine ore storage silos from where ore was proportionally mixed with water and fed into the grinding circuit. The flotation feed pulp was conditioned by automatically controlled reagent additions and processed through the lead recovery flotation circuit. To free the more finely disseminated zinc-sulfide, tailings were reground. The concentrate from each circuit flows out to the thickener tanks where the pulp was thickened to 70 percent solids and pumped to the respective drum type belt filters. The filtered dewatered concentrate was then stored in loading bins until it was automatically loaded out in measured lots for hauling to the smelter. No specific engineering controls were employed in this operation other than a central control room facility equipped with a closed circuit television to monitor the continuous belt conveyor system. The author recommends that this facility not be included in the in depth study of hazards encountered in lead ore beneficiation.
NIOSH-Author; NIOSH-Survey; Field-Study; CT-111-14A; Region-7; Refineries; Control-methods; Control-technology;
Field Studies; Control Technology
NTIS Accession No.
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology;
Division of Physical Sciences and Engineering, NIOSH, Cincinnati, Ohio, Report No. CT-111-14A, 5 pages