- 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 process for sinking through loose, heavily watered ground. A gel-forming chemical is injected into the loose material that is eventually consolidated. The time delay in the gel formation can be controlled by chemical means, and the rate of injection at waterlike viscosity is rapid.
Industry:Mining
A process for the direct production of iron sponge. A mixture of carbon monoxide and hydrogen is used as the reducing agent. The equipment consists of three vertical ovens, for preheating, reducing, and cooling the charge, and apparatus for regenerating the spent gases. The ore is contained in a series of muffle trays, each tray holding about 3 tons of ore. These trays pass down through the preheating oven, where the ore is heated to 1,000 degrees C, and are then transferred to the reducing oven, where they are raised through and against the downward gas current, then transferred to the cooling shaft, and slowly lowered down it. The transfer of a tray from one oven to another is made without contact with air. The ore is preheated in the first oven by part of the gases from the reduction oven, and the sponge iron is cooled in the third oven to 50 degrees C by cold gas from a gas holder.
Industry:Mining
A process for the extraction of gold from finely crushed ores, concentrates, and tailings by means of cyanide of potassium or sodium used in dilute solutions. The gold is dissolved by the solution and subsequently deposited upon metallic zinc or other materials.
Industry:Mining
A process for the extraction of gold from finely crushed ores, concentrates, and tailings by means of cyanide of potassium or sodium used in dilute solutions. The gold is dissolved by the solution and subsequently deposited upon metallic zinc or other materials.
Industry:Mining
A process for the manufacture of high-quality killed basic Bessemer steel in which the steel, after dephosphorization, is poured into another ladle containing the solid components of a basic oxidizing and fluid slag. Blowing for 30 to 40 s generates sufficient heat to promote mixing and to avoid skull. Phosphorus contents are readily lowered and high-quality killed steel is produced with low additional cost.
Industry:Mining
A process for the manufacture of stainless steels in an electric furnace that uses a chrome ore as a source of chromium with or without the addition of silicoferrochromium, conjointly with stainless steel scrap. The hearth of the furnace is lined with chromite bricks.
Industry:Mining
A process for the production of artificial or synthetic graphite. It consists of sintering pulverized coke in the Acheson furnace at 2,760 to 3,316 degrees C.
Industry:Mining
A process for the production of magnesium by electrolysis of molten magnesium chloride.
Industry:Mining
A process for the production of magnesium by the reduction of magnesium oxide with ferrosilicon.
Industry:Mining
A process for the recovery of copper in which a solution of cuprous chloride in sodium or calcium chloride is used to dissolve copper sulfides. The solution is then electrolyzed in tanks with diaphragms. The anodes are impure copper; the cathodes, pure copper. Copper is deposited from the cuprous chloride solution, and cupric chloride is regenerated.
Industry:Mining
