With the successful application of the Tube Press on fine china clays, further test work and product development was carried out on many mineral and mineral by-product applications. A laboratory size Piston Press was designed to test the wide variety of samples and determine filtration characteristics for each. Testing pressures of 2000 PSI (140 bar) … Read more
Shear-flocculation is a term used by Warren (1975) to describe a phenomenon observed when scheelite (CaWO4) was stirred in the presence of a surfactant. At high stirring speeds in the presence of 10 -4 M sodium oleate, the particle size of the scheelite slurry increased. However, in the absence of a collector and/or at low … Read more
Geology The ore deposits are hosted by the platform carbonate and lesser siliclastic sedimentary rocks of the Triassic Star Peak Group. The McCoy gold deposit is a proximal skarn developed principally in limestone of the upper Smelser Pass Member of the Augusta Mountain Formation. The Cove gold-silver deposit is located 1.5 km (1 mi) northeast … Read more
Although paint is often considered to be a relatively simple commodity, it is in fact a complex composite material. Considerable effort is required to design a coating which is easily manufactured, applies easily by a variety of techniques, dries evenly, covers thoroughly, has a pleasing appearance, resists physical or chemical attack, and is cost efficient. … Read more
The current practice for the production of wet-process phosphoric acid (H3PO4) involves leaching beneficiated phosphate rock in the presence of aqueous sulfuric acid (H2SO4). Typical processing involves mining the ore and beneficiating through sizing and flotation to produce a “phosphate rock” concentrate containing over 29 pct P2O5. This concentrate is ground to 90 pct minus … Read more
In order to maximise the benefits obtained from flocculating agents when used as settling aids in high rate and conventional thickeners, it is often necessary to dilute the thickener feed prior to flocculant addition. In some cases, no flocculation at all is possible unless dilution water is used. The most common method of diluting thickener … Read more
The yield of most types of dewatering installation has been shown to be related to cake specific resistance. Any sludge conditioner which significantly reduces the specific resistance will have a marked effect on the yield, and hence the size of the dewatering equipment required. Results from the current research show that the specific resistance behavior … Read more
The McAllister Ta-Sn deposit, located in Coosa County, Alabama, consists of a series of complex pegmatite dikes and pipes which intrude a granite pluton formation. Wodginite ((Ta, Nb, Sn, Mn, Fe)16O32) is the primary tantalum mineral. The deposit was discovered in 1982 by Callahan Mining Corporation, of Phoenix, Arizona, through stream-sediment reconnaissance and soil geochemical … Read more
Mining Equipment Selection Some basic parameters had to be defined at the time: Mechanical or diesel electric trucks. Number of shovels versus size versus number of pits in operation. Size (height and width) of shops and doors. Number of repair bays. Cranes capacity. Number of service equipments (graders, dozers, loaders). The maintenance shop was designed … Read more
Immediately after operations commenced in 1972, Freeport experienced a crusher availability that was less than 50%. It was obvious that a change needed to be made. Primary wet screening was selected to remove the fines which caused plugging of the secondary and tertiary crushers and blinding of the tertiary screens in 1972. Today Freeport’s concentrator is … Read more