- 行业: 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 mode of working coal, in which a certain amount of coal is left as pillars and the remainder is taken away, forming rooms or other openings. The method is also called bord-and-pillar; pillar-and-breast; etc.
Industry:Mining
A model that is the sum of two or more component models, such as nugget, spherical, etc. Adding a nugget component to one of the other models is the most common nested model, but more complex combinations are occasionally used.
Industry:Mining
A modification of sublevel stoping by which a series of sublevels are successively caved.
Industry:Mining
A modification of the axial-flow fan. It consists of two impellers with aerofoil shaped blades that rotate in opposite directions. The drive is by means of a single motor through differential gears, or two separate motors, one for each impeller. They are placed in the airstream and act as streamlined hubs. These fans are available for auxiliary ventilation in mines.
Industry:Mining
A modification of the basic Bessemer process in which all the nitrogen is removed from the blast, it being made up of a mixture of oxygen and carbon dioxide or oxygen and superheated steam. The oxygen and superheated steam blast is claimed to be the more efficient, the final nitrogen content of the metal being brought to a mean level of 0.0028%.
Industry:Mining
A modification of the basic Bessemer process. The main feature is the shortening of the blow by increasing the pressure of the blast as much as possible. Normally, the melt is cooled by the addition of scrap or iron ore, but it is claimed that a fairly high temperature can be maintained without an undue increase of the nitrogen content, so that ladle skulls can be avoided.
Industry:Mining
A modification of the Belgian zinc smelting furnace wherein there are two combustion chambers separated by a central longitudinal wall. In principle, the furnace is similar to the Hauzeur, a compound furnace.
Industry:Mining
A modification of the cyanide process in which the ore is deadroasted, after which all of it is ground to slime, and the resulting product is treated by agitation.
Industry:Mining
A modification of the open-hearth furnace in which the essential feature is the port design. The air ports gradually increase in cross section until they are as large as the hearth itself, thus practically eliminating turbulent flow in the furnace.
Industry:Mining
A modification of the Pattinson process whereby the molten lead is stirred by the injection of steam; used in desilverizing base bullion.
Industry:Mining
