Electrochemical and metallurgical industry . Jour. Am. Chem. Socy. His experi-ments show that the effective (or directly observed) activityof the layers of uranium compounds, sufficiently thick to showthe maximum alpha-ray activity, depends not only on theuranium content but also on the coefficient of absorption of therays by the radioactive substance itself. When this absorptionis taken into account the total alpha-ray activity of any urai^-ium compound is strictly proportional to its percentage ofuranium. This is a direct confirmation of the theory thatradioactivity is an atomic property. Me
Electrochemical and metallurgical industry . Jour. Am. Chem. Socy. His experi-ments show that the effective (or directly observed) activityof the layers of uranium compounds, sufficiently thick to showthe maximum alpha-ray activity, depends not only on theuranium content but also on the coefficient of absorption of therays by the radioactive substance itself. When this absorptionis taken into account the total alpha-ray activity of any urai^-ium compound is strictly proportional to its percentage ofuranium. This is a direct confirmation of the theory thatradioactivity is an atomic property. Met.\lllkgv of Smelting Works at Monteponi, Sardinia.—The Monte-poni smeller is the largest zinc-lead producer in Italy, an<ltreats the complex local zinc lead ores. A brief illustrateddescription of the method of treatment adopted at the works isgiven in the Oeslcr. Zcitsch. fiir Berg. u. Jliittcncr, Sept. 2,by E. Ferraris, the manager. The smelter receives: i. Leadcarbonate ores with some zinc oxide, which are sieved through. —LEAD BLAST FURNACE AT MONTEPONI. a lO-millimcter screen, the part which remains on the sievegoing directly to the blast furnace charge, while the part whichpasses through the sieve is roasted with lead sulphide ores orsintered by itself; 2, lead ores consisting of quartz with IDto 15 per cent lead, which are smelted directly in addition tothe lead carlK)natcs, and 3, lead sulphides, which are groundfine and roasted. During the roasting there is added quartzsand, for the purpose of driving out the sulphuric acid andobtaining an easily fusible lead silicate. The roasting is car-ried out in two hand roasting furnaces, which arc 18 meters October, 1905.] ELECTROCHEMICAL AND METALLURGICAL INDUSTRY. 397 long, and have a capacity of 12 tons of roasted product in24 hours, with a consumption of 1800 kg, or 15 per cent ofEnglish bituminous coal, or 20 per cent of Sardinian browncoal. The smelting furnace charge consists, as a rule, of 50per cent or
Size: 1905px × 1312px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
