Electrowinning is defined as the cathodic deposition of metal, in this example copper, from a copper bearing solution by the passage of an electric current current using an insoluble anode. For copper the electrowinning reaction reaction is: CuSO4 + H2O ⇒ Cu + ½O2 + H2SO4 The overall reaction is the combination of two electrochemical … Read more

How to Fast Track Construction a Mining Project

The construction schedule is a very important part of any complex construction project. If used properly it can alert the construction manager to a variety of problems including ability to complete the project on schedule, overtime construction required to keep on schedule, increase in construction personnel, impact of late equipment arrival, impact of detail engineering … Read more

Nonconventional Fluid Bed Drying

Drying System Design The fluid bed dryer has been designed for the specific requirements of drying a 6 mm x 0 (¼” x 0) feedstock of anthracite culm and occasional intermittent feeds of anthracite silt. The feed moisutre of the culm ranges between 16 and 18 per cent by weight and is approximately 24 per … Read more

Efficient Crushing in Comminution

Recent research into the mechanisms of crushing processes has led to the establishment of new criteria for the effective design and operation of comminution plants. This paper reviews this work and gives examples of the productivity gains and cost benefits that have been achieved in the practical application of these findings. Large cost reductions have … Read more

Carbon In Pulp Interstage Screening using Submerged High Frequency Screens CIP

Mechanical Development – Laboratory Testwork Derrick Manufacturing Corporation originally developed the 1.22m x 2.44m Flo-line screen for rock chip removal from drilling muds. It features a 3° reverse angle deck slope and is powered by dual 1.1 kW TENV motors rotating in opposite directions. Figure 1. Screen feed enters from the lower end and, due … Read more

Adsorption of Silver Cyanide on Activated Carbon

The Nature of Activated Carbon “Activated carbon” or “activated charcoal” is a generic term applied to amorphous carbon materials that have adsorptive capability. These materials are made from different sources and are available as powder, pellets, or grains. Their common characteristic is a very large surface area in the range of 600 to 1200 m²/g … Read more

Laboratory Testing in a Tri-Flo Heavy Media Separator

Heavy media separation is one of a number of pre-concentration techniques for coarse feed which, when the ore is amenable, offers economic advantages in the mining stage and/or the processing stage. In mining, simpler and cheaper methods may be used if a greater proportion of waste material can be included in the mining blocks that … Read more

Thiourea for Extraction of Gold & Silver from Silver Ores

Leaching Chemistry of Gold Silver and Manganese Thiourea is a reducing and complexing agent and can be used for the processing of gold and silver. The redox potential of gold(I) and silver(I) thiourea complexes in acidic thiourea solutions are 0.380 and 0.023 V (vs SHE), respectively (Kazakov et al., 1983; Lodeishchikov et al., 1975). Thiourea, … Read more

Using Wetlands for the Control of Acid Mine Drainage

Metal Removal Processes of Wetlands A wetland environment can remove metals from influent waters in a variety of ways. As chemical oxidation takes place, oxides and hydroxides of iron can be expected to precipitate from surface flow, resulting in the characteristic yellow sediment in mine drainage known as “yellow boy”. These precipitates coat the surfaces … Read more

How to Improved Fine Particle & Bubble Flotation

Selective beneficiation of fine particles depends heavily upon the flotation separation process. Conventional froth flotation for many ore systems is very effective for particles between 300 and 20 µm in size, but the flotation efficiency commonly drops off as the particle size decreases below 20 µm. Flotation kinetics has been used by Sutherland (1955) and … Read more