Gravity Concentration

Air Pulsated Jigs

An air-pulsated jig has teen widely adopted as a main coal washer. It may be mainly because of its many technical and economic features such as large capacity, low running cost, long life, etc. However, the recent increasing demand of fuel coal requires a higher productivity and efficiency of the air-pulsated jig. To fill this … Read more

Jigs & Coal Preparation

Traditionally in coal processing jigs have been used to clean the coarse coal fraction, the +3/8″ or +¼” material. Today with the advent of modern fine coal jigs in the United States, its place was moved from the coarse to the intermediate coal circuit, the 3/8″ x 100 mesh.     Recent theoretical performance and … Read more

Reprocessing Gold Tailings by Gravity Methods

Tailings originating from the gravity concentration of a gold ore containing about 14 g/t Au have been treated by various beneficiation methods. These tailings have been screened on the 147 and 74 micron sieves and the two coarsest fractions have been separated on shaking tables with unsatisfactory results, but the concentrates have been examined in … Read more

Gravity Concentrators

For some decades now, the use of gravity separation techniques to recover valuable minerals has been relatively neglected in comparison to the developments in flotation and hydrometallurgical technology. However, more recently, there has been a resurgence of interest in gravity separation, especially in utilizing its low cost to improve the economics of high tonnage and/or low … Read more

Dry Gravity Separation

The basic principle of this separation method was already defined in the middle of the nineteenth century. However, a change over for the treatment of minerals has followed from the construction of proper machines i.e. airjigs and airtables as late as in the twenties and thirties of this century. The main application of this technology … Read more

Classification & Concentration of Heavy Minerals

The recovery of heavy minerals by gravity concentration during grinding is practiced widely in the minerals industry. Studies have shown that the grade and recovery of the concentrate depends not only on the performance of the concentrator but also on the degree of liberation achieved in the mills and the scavenging action of the hydrocyclones … Read more

Laws of Gravity Gold

Ten Laws of Gravity Gold Recovery DO DON’T Try to Evaluate the Economic Impact of Gravity Recovery Get a Statistically Significant Sample of the Ore to Evaluate Gravity Response on a Size-by-Size basis Design the Gold Recovery Circuit with a Good Understanding of Gold’s Behaviour in Grinding Circuits When GRG Recovery Is Not Indicated, Look … Read more


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: … Read more

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 … Read more

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 … Read more