Blast Furnace Coke Hardness
Changes in coke hardness affect the working of the blast furnace, for soft coke is an obstacle to proper furnace operation. Soft coke is due to a low hydrogen-oxygen ratio in the coal charged; increasing this ratio increases the hardness of the coke. The best means of determining the hardness of coke is the combined […]
Retort Furnace, Retorting Pot & Condensing Pipe
This retort furnace, is an improvement on those formerly constructed. It has three dampers for directing the flames and heat from back to the front end of the retort. As the entire retort and its cover is within the furnace the mercury is equally driven off from all parts of the amalgam, leaving the whole mass […]
Electrostatic of Minerals and Flotation
The development of every new metallurgical method is accompanied by a host of contradictory statements and widely differing opinions, but it is only by the elimination and correlation of parts of recorded observations that a particular process approaches a state of perfection. The theory of flotation has called forth a number of articles, each writer […]
Electrochemistry of Flotation
If one turns to ‘Elementary Lessons in Electricity and Magnetism,’ by Silvanus Thompson and studies the fundamental principles of frictional electricity, as given in Chapter 1 of Electrochemistry of Flotation, a clearer idea of the causes of ‘flotation’ may be obtained. After seeing a few experiments, such as were performed at the Case School of […]
Cyanide Leaching of Flotation Concentrate
When Charles Butters began to take up the work of flotation in our Oakland laboratory, one of the first points brought to our attention was the treatment of the concentrate produced by flotation; J. E. Clennell was accordingly instructed to undertake the researches detailed in the present paper. The whole value of the process hinges […]
Air Injected Froth Flotation
The manifestation of the force of surface tension is a phenomenon that shows itself as a tendency of any liquid body—we may confine ourselves to a liquid—to assume that shape in which it has the least surface. It is a well-known fact that in the form of a sphere the ratio of surface to volume […]
Surface Tension and Salts in Solution
Surface tension has been threshed out pretty thoroughly by articles appearing in the Journals of the American Chemical Society, beginning in 1908. These articles deal with the drop-weight method (weight of a falling drop) for the determination of molecular weight, critical temperature, and surface tension, and they describe the apparatus used. The work was started […]
Gold & Silver Recovery from Mexican Ore
The mill receives 200 tons per clay of crude mine ore. After being crushed to 2-inch size, this ore is passed over a picking-belt, where one ton of high-grade ore and four tons of waste are removed each day. The remaining 195 tons of second-class ore is crushed in stamp-batteries to pass a 4-mesh screen. […]
Flotation of Copper Ores
Pneumatic flotation is already fully established in a number of places and the results in comparison with the other and older schemes fully justify the opinion of your correspondent that it constitutes the most distinct advance in flotation in recent years. The first pneumatic-flotation plant in this country was erected by me in February 1914 […]
Molybdenum Roasting
Molybdenite Roasting with Sulfuric Acid Plant VS Looping Sulfide Oxidation (LSO) with Sulfuric Acid Plant Engineering Design Construction Training & Start-up Capital Cost Studies Feasibility Studies Operations & Maintenance Peer Reviews Modernization Capacity Expansion Patents and Papers MoS2 Roasting Experience Fort Madison, IO, USA Sierrita, AR. USA Langeloth, PA. USA Washington, PA. USA Winslow, NJ, […]