- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
Greenish-yellow peridot (olivine). Not to be confused with "goldstone."
Industry:Mining
Griffith's theory of failure is based on the assumption that the low order of tensile strength in common materials is due to the presence of small cracks or flaws. Actual stresses may occur around these flaws, which are of the order of magnitude of molecular cohesion values, while the average tensile strength may be quite low. Mohr's theory predicts that failure of materials is due to failure in shear, whereas Griffith's theory postulates that it is due to failure at crack tips.
Industry:Mining
Grinding appliance such as two disks set close and rotating rapidly in opposite directions, so as to shear or emulsify material passed between them.
Industry:Mining
Grinding in such a manner as to cause one ingredient of the feed to be ground preferentially to others.
Industry:Mining
Grinding mill in which spring-loaded rollers bear against a horizontal rotating bowl-- developed for coal pulverization.
Industry:Mining
Grizzly fixed at one end only, the discharge end being overhung and free to vibrate. This vibration of the bar is caused by the impact of the material. The disadvantage of the ordinary bar grizzly is clogging due to the retarding effect of the cross rods. This has been overcome in the cantilever grizzly by eliminating the tie rods except at the head end, where they are essential. The absence of these rods below the point of support also aids in preventing clogging because it permits the bars to vibrate in a horizontal plane, which keeps the material from wedging.
Industry:Mining
Grizzly in which alternate bars rise and then fall gently, any required lateral (conveying) movement being built into the mechanism, therefore reducing loss of headroom in conveying and screening. Other types are traveling bar, ring-roll, and chain grizzlies.
Industry:Mining
