Centrifugal Casting of Refractory Concretes
As part of its program to conserve the Nation’s natural resources by developing improved performance materials, the Bureau of Mines, U.S. Department of the Interior, in cooperation with the U.S. Department of Energy, has conducted an investigation of materials of construction able to withstand the high temperature and hostile environments encountered in coal gasification units. […]
Carbon-in-Pulp CIP – Gold Adsorption
A jig tailing with gold content ranging from 0.33 to 0.43 oz/ton was leached in weak cyanide solution with extractions of up to 97 pct in 24 hours. By countercurrent batch leaching studies and laboratory pilot plant operation, minus 10- plus 20-mesh and minus 6- plus 16-mesh coconut carbon were loaded to 700 oz/ton of […]
Improving Metallurgical Balance
All metallurgical balance techniques, old or new are based on mathematically equating the inflow and outflow of specific components at a balance point. This equality is always valid with a steady state process, but is also valid for a fluctuating process if the sampling period is sufficiently long to make inventory changes at the balance […]
Potash Laboratory Flotation Tests
Large tonnages of high-grade sylvinite ores, containing low concentrations of water insolubles, have been processed in the Permian basin region near Carlsbad, N. Mex., during the past 40 years. The high-grade ores are rapidly being depleted, leaving large reserves of lower grade ore. This lower grade ore contains 1 to 8 percent water-insoluble slimes. These […]
Mill Bearing Strength & Grinding Mill Design
First, let us look at the mill itself. Fig. 1 shows that there are four basic components – The shell, the heads, the ring gear and the trunnions. The heads are usually bolted to the shell. The trunnions are secured to the heads by bolts or made integrally with the head. The ring gear is […]
Flotation Circuit Automation
Flotation circuit designs are also being influenced by operating philosophies possible with computer automation. It has been pointed out that flotation flowsheets tend to be simplified through use of online control. Logical control capability can reduce the necessity for recirculating streams, bringing circuits into open circuit mode with little or no metallurgical losses. Control techniques […]
Automatic Grind Control
The “best” control strategy for a given plant is the strategy that most closely fulfills the overall operating objectives. The best strategy will likely not be “optimum” for any given specific goal but rather will involve a series of trade-offs made in consideration of the many factors that influence the operation in any significant way. […]
Autoclave Leaching of Copper Nickel Matte
A part of the U.S. Department of the Interior, Bureau of Mines, research program is to develop improved or alternative methods for metal recovery from domestic resources, and thereby help to insure an adequate supply of mineral raw materials for the U.S. economy. Since about 80 pct of the nickel requirements are imported, research studies […]
Acid Activated Clay Adsorption Properties
Acid Treatment of Bentonite: Under the influence of a mineral acid the exchangeable alkaline earth ions of bentonite are substituted by hydrogen ions. Moreover, depending on the acid concentration, temperature, pressure and reaction time, a more or less pronounced leaching process takes place. Thereby Al-, Fe- and Mg-ions are extracted from the octahedron layers. This results […]