- 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 method for producing direct from ore an iron in the form of either sinter or pig that is suitable for charging in steel furnaces. Ore, limestone, and carbon in the form of coal, coke, or oil coke in the proportions of 40:8:5 are dried, crushed to about 1/16 in (1.6 mm), intimately mixed, and fed into the upper end of a sloping rotary kiln.
Industry:Mining
A method for producing low-temperature coke in which each retort is a monobloc iron casting 9 ft (2.7 m) high, containing 12 tubes, which taper from 4-1/2 in (11.4 cm) at the top to 5-1/4 in (13.3 cm) at the bottom. A battery contains 36 retorts in 2 rows of 18. Retorts and combustion chambers are arranged alternately, so that each retort is located in a radiation chamber formed by the walls of adjacent combustion chambers. The retorts are heated only by radiation from these walls, so that there is no overheating and the inside temperature of the retorts can be maintained accurately at 1,112 degrees F (600 degrees C). A cooling chamber is fitted below each pair of retorts, of a size sufficient to hold the coke from both. The pairs of retorts are charged and discharged every 4 h.
Industry:Mining
A method for producing low-temperature coke in which each retort is a monobloc iron casting 9 ft (2.7 m) high, containing 12 tubes, which taper from 4-1/2 in (11.4 cm) at the top to 5-1/4 in (13.3 cm) at the bottom. A battery contains 36 retorts in 2 rows of 18. Retorts and combustion chambers are arranged alternately, so that each retort is located in a radiation chamber formed by the walls of adjacent combustion chambers. The retorts are heated only by radiation from these walls, so that there is no overheating and the inside temperature of the retorts can be maintained accurately at 1,112 degrees F (600 degrees C). A cooling chamber is fitted below each pair of retorts, of a size sufficient to hold the coke from both. The pairs of retorts are charged and discharged every 4 h.
Industry:Mining
A method for the determination of the tensile strength of rock, concrete, ceramic, or other material by applying a load vertically at the highest point of a test cylinder or disk (the axis of which is horizontal), which is itself supported on a horizontal plane. The method was first used in Brazil for testing concrete rollers on which an old church was being moved to a new site.
Industry:Mining
A method for the direct production of steel by passing reducing gases over iron oxide ore, carburizing the reduced ore, and alloying it in an electric furnace. Thus, a reducing gas, heated to 900 degrees C is passed over iron oxide ore to produce metallic iron and spent gas. The carburized, partially reduced metal is melted, reduced, and alloyed in the electric furnace.
Industry:Mining
A method for the low-temperature reduction of iron ore by means of a series of rotary kilns. The kilns are each about 5 ft (1.5 m) in diameter and 30 ft (9.1 m) in length. The first is used for preheating, the second for reduction, and the third for cooling the product. Pulverized coal is used, which makes it readily possible to control the combustion and to maintain constant temperature.
Industry:Mining
A method for the prevention of the escape of warm gases from the entrance or exit of a continuous furnace, or tunnel kiln, by blowing air across the opening.
Industry:Mining
A method for the production of sponge iron that consists of charging fireclay pots with flat briquettes of a concentrate of iron ore interspersed with layers of carbon, prepared by mixing coal with coke breeze; the pots are charged in batches in a long pit furnace where they are heated to about 1,200 degrees C.
Industry:Mining
A method for the quantitative determination of certain elements (such as carbon, hydrogen, and nitrogen) in organic compounds by combustion.
Industry:Mining
