Rtmospheric Pollution
derucaru I952
A concerted effort is being made by Los Angeles nonferrous industries to reduce lead emissions in order to protect employees and improve air hygiene
T
HE United States Bureau of Mines has in . 'press an Information Circular entitled "Control ai Metallurgical and Minerd Dusts and Fumes in 1.0s Angeles County, Cslif." The report states that 80 t o m of metallurgical dust and fumes were discharged into the Loa Angeles atmosphere before the advent of air pollution control. Therefore, it is concerned with the steps taken by the metallurgiwl and nlinersl industries to determine the nature and amount of dust and fume they produce, and the methods used to control their emissions at the ~ource.
t y p i d plant, following dilution of the fumes with 2.6 volumes of air from ouUt aide the furnace amounted to 0.026 g r i n per cubic foot, OP about 394 times tho threshold limit. Tlrc role of lead fumes &s possible smog-forming eonlaminants in Los Angeles sir is still a matter of considerable conjecture. Nevertheless, a concerted effort is being made, and with considerable ~ucees~fi, hy nonferrous industrid concerns to reduce their Iead emission. Chemical lead melts at about 618' to 621' F. and boils at ahout 2935' F. Corresponding figures for aoft or corroding lead are aomcwhat higher. Thus load is not readily distilled like zinc at furnace temperatures (800" to 1300" F.) used in lead reclaiming operations. Lead in all o p containing low-boiling point met.al8 such &s sin
