Tri-Flo
During several years of operation in Europe, South Africa and other countries, the Tri-Flo has demonstrated to represent a substantial improvement of the dense medium dynamic separation systems. The reasons are: high sharpness separation due to the multistage system and the application of new concepts m designing the regeneration circuit and controlling the medium rheology: […]
Ferrosilicon Powder
Ferrosilicon powder (containing approx. 15% Si) for constitution of heavy media is used today in many separation plants treating iron and other ores. The production of the powder by grinding is expensive. A new process atomizes the still molten ferrosilicon by air or steam. In a heavy medium this atomized ferrosilicon powder has several remarkable […]
Gold Trommels & Gold Scrubbers
Gold Trommels & Scrubbers are noted for economy and efficient performance in cleaning sand, gravel, crushed stone and various ores. These machines are ruggedly constructed and are designed for excellent results with a minimum of water, power and maintenance. Time and again users report lower cost per ton with Gold Trommels & Scrubbers. Gold Trommels […]
Floating Gold Wash Plant
Figure 125, A and B shows typical arrangements using floating gold washing and gold-saving plants (“boats”). Figure 125, C, is a plan of an operation where the gravel is first dug by a power shovel and is then picked up by a dredge equipped with a light bucket line. Where floating plants can be employed, […]
Falcon Enhanced Gravity Separator
Enhanced gravity separation devices (centrifuges) have been patented for over a century but were impractical until recently. The physical laws behind the concept were well understood but engineering had to catch up with the science. This included the development of abrasion resistant materials, the improved design of rotating equipment that allowed higher RPM, and a […]
Dredging Safety
In the 1940’s, we visited hydraulic and dredge mining operations in Alaska and California. He also reviewed 10 yr of accident data pertinent to such mining in the United States. The data, covering the period 1933 to 1942, included those related to 36 fatalities and 3,700 injuries in dredge mining. It is generally assumed that […]
Spiral Separators VS Concentrating Tables
Concentrating Table As far as the efficiency of the concentrating table is concerned, it has been established that a table can clean coals of 9.5mm x 0.075mm(3/8″ x 200mesh) with high efficiencies and low probable errors. It is, however, important to notice that the particle size of coal treated on a table has a significant […]
Fine Coal Cleaning Centrifugal Washing
The most common method used for cleaning the fine fraction in today’s coal preparation plants is froth flotation. Past research and practice has found that froth flotation achieves excellent separation efficiencies for fine coals having only a small fraction of middling particles. However, its efficiency decreases sharply as the concentration of middling particles increases due […]
Design and Control for Dense Medium Separation Plants
The two-density separation by dense medium cyclones was generally performed using two dense medium plants in sequence. In contrast to the former technology, the multi-density separation can now be performed by using a single medium circuit composed of different interconnected medium sumps. The sumps, one for each density, are fed with different medium streams selected […]
Recover Silver by Gravity Concentration
In some cases, silver will recover very well by gravity. In laboratory testing, two kilograms of plant feed was ground to 80µm F80 and passed through a Falcon concentrator. The Falcon concentrate was panned to upgrade the concentrate and reduce the mass recovery to what is typically achieved by plant operations. A flowsheet and summary […]