Germanium is an important strategic metal used in fiber optics, infrared detectors, and semiconductor devices including transistors, diodes, and rectifiers. Substitution for germanium cannot be
Current practice for the production of wet-process phosphoric acid (H3PO4) involves leaching beneficiated phosphate rock with aqueous H2SO4. Typical processing involves mining the ore, also
Because of higher efficiency, wet grinding is more widely used than dry grinding, but leads to an increased consumption of grinding media due to corrosion
The estimating of volumes is a routine practice in an open pit-heap leaching operation. Until recently, the conventional cross-section manual method has been used at
Tailings originating from the gravity concentration of a gold ore containing about 14 g/t Au have been treated by various beneficiation methods. These tailings have
The pellets were produced in the pilot plant, and followed the steps bellow: – Definition of pellet chemistry – Model for high MgO blast furnace
Molten-salt electrolysis of lead chloride is an integral unit operation in a ferric chloride leaching process that was developed by the U.S. Bureau of Mines
At the present time, zinc is produced commercially by a roast-leach zinc electrowinning process. The primary source is high-grade concentrates of the mineral ZnS. Concentrates
Trends in extractive metallurgy in recent years from milling and smelting of high-grade ores toward heap leaching and electrowinning of low-grade or marginal ores, have
Wood cribs are used extensively by the coal mining industry in a variety of applications to stabilize mine openings. The U.S. Bureau of Mines is