- المجال: 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 ...
A flotation process that is not strictly of the same class as others, but still makes use of the principle of selective oiling of sulfide particles. The crushed ore is fed into an agitator and mixed with 4% to 5% of its weight of a paste made of one part of oil or thin tar with three or four parts of magnetic oxide of iron. This oxide must be ground to an impalpable powder. These ingredients, with enough water to make a pulp, are agitated for 5 to 20 min. The paste preferentially adheres to the sulfides because of the oil. The ore is then fed over magnets, and oxide of iron, with the mineral adhering to it, is pulled out. The oil and magnetite are then recovered.
Industry:Mining
A flotation process that separates galena and zinc blende by treatment, at a low temperature, with eucalyptus oil or other frothing agent, and with agitation or aeration in a neutral or alkaline, but not acid, solution of the sulfates, chlorides, or nitrates of calcium, magnesium, sodium, potassium, or mixtures of these substances.
Industry:Mining
A flotation process that uses, instead of an acid bath in deep pans, a dilute solution of aluminum sulfate in shallow pans.
Industry:Mining
A flotation process utilizing the surface tension of water, either fresh, acid, or salt.
Industry:Mining
A flotation reagent in which the reactive group is acid in character. In these collectors the hydrocarbon group is in the anion. The most common anionic collectors are fatty acids (carboxylic acids). They occur naturally as complex mixtures in which the hydrocarbon chain is saturated or unsaturated.
Industry:Mining
A flow net whose boundaries have been properly modified (transformed) so that a net consisting of curvilinear squares can be constructed to represent flow conditions in an anisotropic porous medium.
Industry:Mining
A flow process in which none of the variables of flow changes with time.
Industry:Mining
A flow the velocity of which is undergoing a positive or negative change. If the flow is constant it is referred to as uniform flow.
Industry:Mining
A flow-equalizing device that is fitted to tube breathing apparatus. There are two kinds in general use, one consisting of a flexible, corrugated rubber tube and the other a canvas fabric bag. On inspiration, air is drawn partly from the equalizer, which is reduced in volume, and partly from the tube. On expiration, the equalizer restores itself to its original volume and in doing so draws air through the tube. Thus the air is kept flowing very nearly in a continuous stream, and the wearer, without the aid of bellows or rotary blower, experiences very little resistance to breathing.
Industry:Mining
