Surface Charge in Flotation

The selective flotation of alkali halide salts such as KCl and NaCl is of great industrial significance and has been considered by flotation chemists for many decades. The surface-charge model was rather controversial when it was first presented at the SME Annual Meeting in Los Angeles in 1967. Basically this model suggested that the alkali … Read more

Mine Drum Hoist Rope Maintenance

Mining Companies employ the use of mine hoists to transfer ore, men and materials through a vertical shaft or slope. With varying depths, payloads and equipment, it is necessary to select a rope construction that is best suited for these parameters and that can also provide the most economical cost per ton hoisted. If the … Read more

Gold & Copper Dissolution from Gold & Copper Alloys

The dissolution behavior of copper and gold from their pure state and from Au/Cu alloys in cyanide solutions has been investigated using a rotating disc. Oxygen was used as an oxidant. The effect of the composition of the alloys, stirring speed of the disc, concentration of lixiviants and temperature on the overall dissolution kinetics has … Read more

Elutriation Flotation for Recycling of Waste Plastics

The management of solid waste is an ever increasing concern in the United States. Every year our nation generates between 140 to 160 million tons (Lichstein, 1990 and Thayer, 1989) of municipal solid waste. Only about 10 pct of the waste is recycled, mostly aluminum and paper. About 135 million tons of this waste end … Read more

How to turn Dust into Gold

The primary metals sector was particularly hard hit early on, to develop the technology, acquire the equipment, and implement the programs to eliminate or reduce the by-products of metal making. To this end, through a combination of technological innovation and extensive capital expenditures, the metals industry has net, and in many cases, exceeded the minimum … Read more

Slurry Ash Analyzer Theory

Coal cleaning plants have traditionally been operated with the primary goal of minimizing the operating cost, with little attention to quality control. However, increasingly stringent air-quality regulations have made the product quality more critical. Without automatic controls, plants often must sacrifice recovery in order to meet specifications. Instrumentation and control, by providing a means for … Read more

Geology of the Red Dog Mine

Red Dog is a Mississippian to Permian aged sulfide deposit located in the western Brooks Range north of Kotzebue, Alaska. It belongs in the family of black shale hosted sedimentary exhalite deposits but lacks classic sulfide sedimentary textures. Pervasive silicification, and a significant portion of the mineralization, is replacement in nature. An extensive feeder vein … Read more

Bench Scale Froth Flotation & Economic Estimate

ICF KE assembled a team that included members of industry, academia, and industry research organizations to conduct this multi-task program. The original design was based on a philosophy developed by the members that incorporates the DOE contract requirements and desires for future commercialization. The following is a listing of the design philosophy: Minimum acceptable energy … Read more

Pyrite Recovery Mechanisms in Coal Flotation

In many coal flotation operations, a significant amount of apparently liberated pyrite is seen to report to the froth, thus raising the sulfur content of the clean product and reducing its economic value. Prevention of this unwanted recovery of pyrite is therefore desirable. Theoretical Discussion It has long been known that mineral pyrite has some … Read more

Pressure Oxidation of Silver Bearing Sulfide Concentrates

Silver bearing bulk sulfide concentrates from several Peruvian mines were autoclaved in a 19 liter (five gallon) laboratory autoclave. Cyanidation of autoclaved concentrates following a hot lime jarosite destruction step extracted over 98 percent of the silver and over 95 percent of the gold. Autoclave operating parameters such as time, temperature, pulp density and autoclaved … Read more