The pouring of the first dore bar on April 21, 1983, marked the conclusion of an engineering and construction project which brought about the revival of mining in Mercur Canyon, 105 km (65 miles) southwest of Salt Lake City, Utah. Previous mining activity in the canyon had ceased at the beginning of World War II, … Read more
Lead is one of the oldest metals known to man and has been used for hundreds of years. The method for producing lead from galena has changed very little. A lead concentrate is mixed with fluxing agents, roasted to remove sulfur, and heated to about 1,000° C with carbon to obtain an impure metallic product, … Read more
The solvent extraction unit of both systems contained four extraction and four stripping stages through which aqueous and organic phases flowed continuously and counter-currently. Each stage of the United Nuclear system consisted of a conventional mixer-settler. Each stage in the extraction circuit of the C-E Natco SX pilot utilized a throttled centrifugal pump for fluid … Read more
Objective To devise an economical, environmentally acceptable method for recycling scrap lead-acid batteries. Approach A combination electrorefining-electrowinning method for recycling lead metal and sludge from scrap batteries was devised which produces a 99.99 + percent pure lead product and eliminates the lead and sulfur oxide emissions that are the normal by products of high-temperature smelting … Read more
The continuous vacuum filtration is the solid-liquid separation process that is nowadays most frequently used in the beneficiation industry all over the world. After a development time of several decades, the various filter types such as drum filter, disk filter, plate filter and belt filter can be considered as a sound fractional design ensuring a … Read more
Talc, a hydrated magnesium silicate, is a major constituent of soapstone, which is used in the manufacture of thermal and electrical insulators. Talc also finds applications as filler for use in the paper rubber, and textile industries, in the preparation of soap, cosmetics, lubricating and special polishing agents, as well as in the paint and … Read more
The processing of ores for the recovery of minerals such as phosphate (U.S. Bureau of Mines, 1975), potash (C. E. Jordan, 1977), bentonite (S. G. Amplan, 1975), and coal (R. E. Zimmerman, 1978) generally results in the production of ultrafine waste materials, which respond poorly to conventional physical separation and dewatering techniques. In many cases … Read more
In the preliminary phases of mine planning it is often desirable to quickly estimate approximate sediment basin construction costs based on readily available physiographic data for a large number of proposed sedimentation ponds. A procedure is presented whereby sediment basin embankment volumes, disturbed areas, and principal spillway pipe lengths can be quickly estimated with acceptable … Read more
The trend in new process plant design is moving towards the multi-screened large capacity modular design. As a result, multiplicity of process equipment will be minimized by the use of fewer, but larger units of higher capacity, or units specially designed for such circuits. One of the essential pieces of equipment in any process plant … Read more
General widespread interest in fine coal cleaning circuits did not occur in the United States until the mid 1960’s. Up until this period the relatively low price for which bituminous coal was sold did not justify for many operators the capital and maintenance costs associated with the beneficiation and drying of fine coal. However, with … Read more