Elutriation Bowl: Falcon & Knelson
Elutriation Another enhanced gravity device was patented in 1935 by A. N. MacNicol (Figure 4). It is also a truncated cone but ribs divide the length into a series of slots. A water jacket and connecting holes are used to inject water and elutriate a bed of material in each. Some companies have produced this […]
Uranium Acid Leaching
Mechanism of Uranium Leaching: Uranium leaching with sulphuric acid is a complex process governed by chemical dissolution, and the oxidation of uranium. It is controlled by surface etching, diffusion, and mass transfer within the ore. The physical parameters are in turn controlled by the physical properties of ore, and the ore size. The leaching process may […]
Cyanide Leaching Platinum Catalytic Converter Chemistry
Previous research by the U.S. Bureau of Mines showed that autoclave cyanide leaching of used automobile exhaust catalysts for recovery of platinum group metals (PGM) was technically feasible. This work involves a more detailed investigation of the chemistry of the dissolution of PGM in cyanide solutions. The PGM species in solution were identified by ultraviolet […]
Thiourea Gold Leaching
The use of thiourea, (CS(NH2)2 as a complexing/extracting agent for gold and other precious metals has shown promise for implementation in the mining/metals industry. Laboratory testing of this reagent has indicated that a thiourea process for gold extraction has several advantages over conventional processing techniques. The use of cyanide for the extraction of gold from […]
Downdraft Tables
As well as metal working, welding or cutting, downdraft tables are also used for human dissection tables although rim exhausts are usually used for this purpose. For manual shoe repair and during application of artificial fingernails, downdraft tables are the only type of exhaust possible. Larger versions are used for sanding, grinding, polishing, and welding. […]
Zinc Chloride & Electrowinning
To help assure an ample domestic supply of zinc and other essential minerals which provide the foundation of the Nation’s economy and security, the Bureau of Mines is investigating an aqueous chlorine-oxygen leaching procedure to produce zinc chloride from complex sulfide concentrates and is also studying methods of fused-salt electrolysis to produce special-high-grade zinc metal […]
Nickel & Cobalt Electrowinning
As part of the goal to develop technology that can meet critical and strategic needs of minerals and metals, the Bureau of Mines is investigating a procedure for selectively extracting nickel, cobalt, and copper from low-grade domestic laterites. Although the Nation produces less than 10 pct of the primary nickel it consumes and essentially none […]
Recover Scrap Battery Lead by Electrolysis
One objective is the secondary recovery of metals, minerals, and other values from waste products and the development of uses for them. In line with this objective, research was initiated to develop an environmentally acceptable alternative to the pyrometallurgical processes currently used by the secondary lead industry. These processes produce 45 pct of this country’s […]
Explosive to Maximize Rock Permeability
Explosive Selection to Maximize Permeability Enhancement: As can be seen from the previous sections the single most important scaling parameter is the postshot cavity radius or sprung hole diameter. From Figures 5 and 7 it can be seen that permeability enhancement is considerably diminished at a distance of 6-10 rc from the center of the hole. […]
Crushing of Mica Ore
Crushing of mica prior to pneumatic processing technique were studied for concentrating coarse mica. Muscovite and phlogophite are the two major commercial mica minerals. However, this research was conducted exclusively with muscovite, and throughout this paper mica will mean muscovite. Two primary forms of commercial mica are (1) sheet mica and (2) scrap and flake […]