OCR Text |
Show 20 strength; of axles and springs, in which resistance to failures due to intense vibration is important; and as a scavenger agent in steel. During World Wars I and II much vanadium was used in armor plate and similar products. General Distribution Shale, limestone, magnetic iron ores and titanif-erous iron ores in various countries throughout the world have a vanadium content in quantities up to 0.5 per cent, but it has not been possible to utilize such low-grade material at prevailing prices, Asphaltites in Peru with 0.1 to 0.9 per cent vanadium content have been mined locally, but the over-all yield of the metal from asphaltite has not been large. Some vanadium comes as a by-product of phosphate fertilizer produced in Montana and Idaho from Phosphate rock that has a vanadium content of less than one per cent and from the ash residue from some fuel oils, but the total amount recovered from these sources has been small. The fact that vanadium in the low-grade materials cannot be recovered at a profit with prevailing prices and known methods of recovery gives great importance and value to the small number of deposits in which the vanadium content Is relatively high. Generally vanadium ore must have a 1.5 to 2 per cent V£05content to have commercial value, although under particularly favorable circumstances a slightly lower vanadium content might have some value. In only four courtrlss |