Testing Refractory Gold Ore
Gold in primary deposits is generally recovered by dissolution in dilute cyanide solution followed by recovery from solution using zinc cementation or carbon adsorption. The dissolution step can be conducted in heaps, vats, or agitated tanks. Gravity concentration, or an intermediate flotation step is an additional process at some operations. An analysis of the processing […]
Ink Flotation from Paper Pulps
Increased recycling of waste paper has been emphasized in recent years in both the USA and Canada for environmental and economic reasons. Removal of ink particles from the waste paper pulp is therefore necessary. One of the most promising methods for ink removal is froth flotation. Our study investigated the feasibility of a simplified flotation […]
Interaction of Grind Size Collector and Frother
hile particle size is universally acknowledged to be important in optimizing industrial copper sulfide rougher flotation circuits, many of the various interactions that do occur at the industrial level with particle size are still being identified and/or quantified. In order to quantify the data collected, a simple two parameter model for fitting time-recovery data will […]
Halide Leaching
The interest in using halogens for extracting precious metals from ores has increased due to changes in ore characteristics, environmental concerns and regulations. The rediscovery of halogen leaching capability has been the topic of these and other writers. Much work has been done on the performance of bromine, chlorine and iodine. Of these, bromine and […]
Metal Dissolution from Silver Copper Alloys in Ammonia
The dissolution behavior of silver and copper from silver/copper alloys in ammoniacal solutions has been investigated using a rotating disc. Oxygen was used as an oxidant. The effect of composition of alloys, concentration of lixiviants, stirring speed and temperature on the overall dissolution kinetics has been studied. Theoretical Background The dissolution of copper and silver […]
Sulfuric Acid-Oxygen Leaching for In-Situ Extraction of Copper Chalcopyrite
Hydrometallurgical treatment of chalcopyrite by sulfuric acid based systems for primary recovery of copper is limited by the refractory nature of the mineral (Bartlett, 1973; Gerlach et al, 1973; Vizsolyi et al, 1967). At ambient temperatures and pressures, leaching of chalcopyrite is slow and current industrial processing is almost exclusively limited to conventional mining, milling, […]
Use of Calcium Sulfate Gypsum as a Fire Retardant
Although calcium sulfate dihydrate, commonly referred to as gypsum, has been utilized for some time in fiberglass reinforced polyester (FRP) applications, it does not have the fire retardant filler recognition of ATH. Gypsum is more commonly known for application in cement, soil and water treatment, plaster, and wall-board. Inherent characteristics of gypsum limit its use […]
Magnetic Separation of Sulphide Minerals: Techniques
Laboratory investigations on the possibility for magnetic separation of sulphide minerals are reported. A survey of several sulphide ores and flotation concentrates shows that magnetic separation in most cases is not a suitable primary method of beneficiation. However encouraging results have been obtained in concentrate purification. Traditionally magnetic separation is associated with iron bearing materials/ […]
Pressure Oxidation Treatment
Since start-up in 1985 the Cannon Mine has produced and shipped a 170 g Au/tonne (5 oz Au/ton) flotation concentrate to various smelters for gold and silver recovery. Several processes have been investigated to economically produce dore’ at the mine site from the refractory concentrate. The designed pressure oxidation circuit utilizes a series of vertical […]
How to use Column Flotation to Reduce Silica
The requirement for higher quality pellets demands that the silica content be lowered to levels ranging from 0.25% – 2.0% SiO2. Reverse flotation (silica is floated away from the iron concentrate) has proven to be an economical and effective method for reducing the concentrate silica content to very low levels. Laboratory and commercial test-work has […]