Flotation Column Gas Holdup & Sparger Systems
The nature of the gas distribution system as well as the hydrodynamics of rising swarms of bubbles can create various profiles. Three radial gas holdup profiles have been identified: parabolic, saddle-shaped and W-shaped. Radial gas holdup profiles have been measured in a large-scale laboratory flotation column using the same multi-cell conductivity probe. Results on three […]
In-Line Static Mixer Flotation Contact System
Conventional froth flotation is one of the most widely used mineral beneficiation processes. Unfortunately, long residence times are often required to achieve complete flotation. These slow flotation kinetics have been associated with the hydrodynamics within the flotation cell. While flotation cell manufacturers have optimized the mixing hydrodynamics, little effort has been made to improve the […]
Sulfide Ore Concentration and Treatment
Geology The ore deposits are hosted by the platform carbonate and lesser siliclastic sedimentary rocks of the Triassic Star Peak Group. The McCoy gold deposit is a proximal skarn developed principally in limestone of the upper Smelser Pass Member of the Augusta Mountain Formation. The Cove gold-silver deposit is located 1.5 km (1 mi) northeast […]
Zinc Column Design
Figure 1 shows the flowsheet for the conventional flotation circuit at Ozark-Mahoning. The plant processes 24.5 mt of ore/hr (27 st/hr) with an average particle size of 60 percent less than 45 µm (325 mesh). Pilot Testing Apparatus and Procedure The controller input was a signal from a level sensor that measures the slurry/froth interface. […]
Selective Flocculation of Zinc Concentrate to Reduce Silica Contamination
Selective flocculation was used to produce superclean zinc concentrate with minimized silica contamination. Research was carried out on a flotation concentrate from the Jersey Miniere Zinc Company (JMZ) in Gordonsville, Tennessee. The material was first dispersed with sodium silicate and then causticized tapioca starch was used to selectively flocculate the sphalerite, leaving the silica in […]
Effect of Sample Storage on Kinetics of Pyrite Oxidation
Pyrite oxidation has been studied extensively in relation to its role in sulfide mineral flotation. Although pyrite usually lacks economic value in polymetallic ores, it generally acts as an undesirable constituent which complicates the separation of valuable minerals. This mineral is also considered to be the main source of acid mine drainage. The formation of […]
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 […]
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 […]
Collector and Flotability of Pyrite, Galena, Chalcopyrite
The relationship between sodium diethyldithiophosphate collector concentration and pH for conditions of incipient flotability of pyrite, galena, and chalcopyrite. If one considers that hydroxide ions compete with collector ions for the adsorption sites on the surface of these minerals, that the amount of collector adsorbed is constant under conditions of incipient flotation, and that the […]