. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. arding the earlier efibrts, difficulties, and progress of this industry. More than fifty years ago machines were constructed and patentedfor the purpose of concentrating the magnetic iron sands of the and other places, but further than that the patents set forththis fact, little is known how far they were successful. However, thatthey were not commercially successful, their non-existence at presentwould indicate ; nor is this result to be wondered at when we conside
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. arding the earlier efibrts, difficulties, and progress of this industry. More than fifty years ago machines were constructed and patentedfor the purpose of concentrating the magnetic iron sands of the and other places, but further than that the patents set forththis fact, little is known how far they were successful. However, thatthey were not commercially successful, their non-existence at presentwould indicate ; nor is this result to be wondered at when we considerthat the successful treatment of this material is the most difficult problemin magnetic concentration. The St. Lawrence iron sands vary from 10 to 50 per cent, ofmagnetite, and from 5 to 15 per cent, of titanium, a large proportionof this latter being also magnetic, and as the presence of over 2^per cent, of titanium in the concentrate depreciates to a great extentthe value of the ore, not only has the magnetic to be removed fromthe non-magnetic, but the two magnetic substances have to be separated. [PLATE
Size: 1770px × 1411px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1902
