Blue Flame Burner
You have all seen a gas stove. Gas burns with tiny, bright-blue cones of flame; they are very hot, very clean, very quick to burn. You have also seen a hardwood fire; when the yellow flame disappears, the charcoal gives off a bright blue, almost transparent flame. Again, this flame is hot, very clean, very […]
Bismuth Dissolution at Smelter
The processing of residues derived from various operations in the mining and metallurgical industry for by-product recovery is becoming more prevalent. A principal target for by-product recovery is flue dust produced by conventional smelting operations. Flue dust from zinc smelters has been processed for many years for the recovery of cadmium. The cadmium recovery technique […]
Anodic Dissolution of Zinc Sulfide Suspensions in Aqueous Solution
A new suspension electrolysis method has been developed, which enables without any gas or dust pollutants a direct anodic extraction of zinc from zinc sulfide concentrates, while simultaneously oxidizing sulfide sulfur to elemental sulfur. The investigations were performed in a laboratory scale electrolytic cell with suspended zinc sulfide concentrate particles with or without graphite powder […]
Maintenance Affects Wire Rope Life in Surface Draglines
As part of a larger study to identify factors influencing the practical operating life of wire rope used on large draglines in surface coal mining, field trips to operating surface coal mines were made during late 1975. Wire rope performance information was obtained from personnel at thirteen mine sites west of the Appalachians. Data Acquisition […]
Control Wet Grinding Circuits
Ideally, mill circuits should be controlled so that excessive random disturbances are reduced in frequency and amplitude. It is difficult to derive an objective measure of the effectiveness of any chosen control strategy. Often, the response of the circuit to pulse or sinusoidal disturbances is used as a measure of the effectiveness of control. Linear […]
Vacuum Filtration
In reviewing available vacuum filtration equipment in this paper, several types of filters have been included which are probably not familiar to operators in the mining industry. However, it was felt that these units might be of interest in the event that an application should arise for the filtration of a product in the future […]
Uranium In Situ Leaching its Advantages – Computer Simulation
In Situ leaching for the recovery of uranium from low grade sandstone deposits is one of the newest technological advances in the mineral industry. It is rapidly developing into a commercially feasible mining system which has economic, environmental, and social advantages over conventional mining systems. Because of the current uranium shortage, development of In Situ […]
Solvent Extraction Economics
The equipment which is used in solvent extraction plants for contacting the organic and aqueous phases and separating the same is varied. Most common to the industry is the mixer-settler unit which, in itself, can be of varied design; but many new innovations in contacting and separating equipment have been recently introduced or are now […]
Recycling Plastics from City Waste
Nearly 4 billion pounds of plastics were consumed by the packaging industry in 1970, about one-fifth of the total plastics production. Urban refuse from the city of Madison, Wis., was found to contain 2.9 weight-percent plastic before drying and 3.3 weight-percent after drying. Plastic waste is a worldwide problem: urban waste contains about 2 percent […]
Sulphidized Cassiterite & Iron Oxides Separation
Low recoveries of cassiterite are obtained by gravity concentration of lode deposits, particularly if the cassiterite calls for fine grinding of the ore. And it is precisely this finely ground ore that is the cause of the low recoveries. The possibility therefore of upgrading the ore by flotation has been of great interest to the […]