Wet Magnetic Separation
In essence, any magnetic separator operates on the basis of imparting a preferential magnetic force on particles of higher magnetic susceptibility which are to be separated from particles of lower magnetic susceptibility. A certain amount of directional deviation to the particles takes place thus allowing for collecting each category of particles separately. Under fixed […]
Techniques to the Extraction of Values from Municipal Refuse
Incineration has, in recent years, been considered by many as a major source of air pollution. However, a number of reports refute this belief. The former report states that the National Academy of Sciences has published data showing that refuse combustion accounts nationally for only 2.6 percent of air pollutants. The report also states that […]
Electric Drives for Large Ore Grinding Mills
Ore grinding mills are really just slowly rotating barrels, but barrels that are growing in size so fast that the application of electric drives for them is rapidly approaching a technology like that for wind tunnels or pumped storage drives. This application is particularly worthy of care because some 40% of the 75 megawatts of […]
The Effect of Lime on Reduction of Iron Ore Pellets
For the commercial production of iron ore pellets from hematite ores, as it is practiced in various pellet plants, the addition of lime has shown to be an efficient means with a view to improving cold compression and abrasive strength of the indurated pellets considerably. Unfortunately, it has also been shown at the same time, […]
Effect of Dolomitic Lime on Magnetic Taconite Pellets
For maximum blast furnace productivity it is generally believed that the iron oxide pellet should contain as many of the ingredients of the burden as possible. As a result over the past 10 years considerable research effort has been directed towards the development: of self-fluxed iron oxide pellets. Calcitic limestone has been used as the […]
Chemical – Quality Control of Metallurgical Wastes
There are generally four operational units in Butte: underground mines, open pit mine, concentrator and precipitation plant. As with copper production, the waste water systems for all units are interrelated. Acidic mine water is pumped up the Kelley shaft and distributed on leach dumps. Major waste water discharges from the Butte operations include: about 4400 gallons […]
Continuous Mechanical Froth Flotation Cell
The BSA and DRC models have been shown to offer excellent alternatives to the NDRC model, given previously in the literature (1) in predicting the dynamics of glass bead flotation. Since the TP model converged to unrealistic parameter values and gave the poorest data fit, the TP model is judged unacceptable for predicting continuous mechanical, […]
Coarse Grinding in a Ball Mill
Rod mills were developed as a logical substitute for the rolls crusher when larger tonnages had to be handled, on a continuous basis. Today, with even larger tonnages to process, the trend is to install larger equipment, automate the plant and develop the highest availability possible, in order to cut costs. The rod mills, because […]
Chemiluminescence Detector
Instruments currently in use for routine measurement of ozone in the atmosphere are based on ultraviolet spectrometry, coulometry, or colorimetry. Studies have shown that none of these techniques is completely satisfactory for routine ozone measurement, either because the instruments require an inordinate amount of attention or because they lack the requisite specificity to ozone or […]
Basic Control Strategy for Mineral Processing
The principle purpose of applying control to any process is to improve its profitability. Even when considering the impact of a plant on its surrounding ecology this is still true, since the sanctions felt most immediately from violations of the regulations are the economic penalties or fines which result. Economic performance can be improved within […]