Records of the Geological Survey of India, Volume 76, Issue 12Geological Survey of India, 1942 - Earthquakes |
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Page 23
... crushed to a dust , and kept in storage bins . " The sand is a pure , fine , quartz sand free from iron . " The mixture is loaded into a rectangular electric furnace and subjected to intense heat for 36 hours . After cooling , the sides ...
... crushed to a dust , and kept in storage bins . " The sand is a pure , fine , quartz sand free from iron . " The mixture is loaded into a rectangular electric furnace and subjected to intense heat for 36 hours . After cooling , the sides ...
Page 25
... crushed to about inch and then calcined at about 2,000 ° F . in a rotary calciner to drive off the combined water , leaving a material which should contain 80 per cent . alumina , or over . This pre- liminary calcination not only ...
... crushed to about inch and then calcined at about 2,000 ° F . in a rotary calciner to drive off the combined water , leaving a material which should contain 80 per cent . alumina , or over . This pre- liminary calcination not only ...
Page 26
ferrosilicon removed and the alumina is further crushed and pulverized . After magnetic impurities are removed it is finally graded into various sizes of grains required by the trade . " Fused alumina has not so far been manufactured in ...
ferrosilicon removed and the alumina is further crushed and pulverized . After magnetic impurities are removed it is finally graded into various sizes of grains required by the trade . " Fused alumina has not so far been manufactured in ...
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A. L. Coulson Abrasive Industry abrasive purposes Abrasive wheels Almandite aluminium artificial abrasives B. C. Roy bauxite beds Bihar Burma Canada Department Carborundum cent chert coated abrasives coated cloth coke colour corundum Corundum occurs crushed crystals Department of Mines Deposits Dhalbhum Diamond Diatomite Emery employed felspar flint Fused alumina future trend garnet garnet sands Geol Geological Survey glass grains grey grinding hard Hazaribagh district high grade honing stones impurities ingredients iron J. A. Dunn J. A. Mineral Resources Kashmir Kyanite large quantities limestone LXXVIII M. S. Krishnan Madras manufacture of abrasive manufactured abrasives Marketing and future Memoir metal polish mica Mysore natural abrasives oxide paper and cloth pebbles polishing material powders Products of Canada Pumice Resources of Bihar Rewa Risin spur rock sandstones siliceous silicon carbide sillimanite Singhbhum steel balls Steel wool suitable surfaces Surv Survey of India Talc Tripolite varies Vindhyan Volcanic dust