How to Recover Silver from Waste Photographic Solutions
Metallic displacement-type silver recovery units are economical and practical for use by either large- or small-scale photographic processors. Most photographic processors could significantly increase their income by utilizing a unit of this type. The large-scale processor may find it advantageous to use the metallic displacement-type unit as a scavenger following an electrolytic cell. Electrolytic units […]
Smelting of Military Electronic Scrap
Gold, silver, and platinum group metals are widely used in electronic and electrical components to provide long-term reliability, Construction of military equipment consumes the largest proportion of the precious metals used in the electronic and electrical industry. Due to obsolescence and damage, military electronics are presently being scrapped at the rate of about 15,000 tons […]
Smelting & Refining Terms and Conditions – Typical Example
One of the most frequently asked questions is: “Where is copper (price and usage) going?” I will not attempt to forecast either the future price of copper or the future growth of the copper industry; rather I would like to discuss the current trends experienced in the smelting and refining terms and conditions for sales […]
How Minor Element Affects Copper Matte Smelting
Minor-element interactions in equilibrated samples of copper matte and silica-saturated iron silicate (fayalite) slag have been studied by the Bureau of Mines to gain basic and fundamental scientific information that will support the mineral industry’s effort to improve productivity, increase energy efficiency, and reduce undesirable environmental impacts. This work was carried out as an adjunct […]
Improve Strength of Steel Alloys
Improve the strength and other properties of steel alloys. Approach Research by the U.S. Bureau of Mines indicates that steels melted and solidified under high nitrogen pressure acquire yield and tensile strengths that are up to four times the strengths of comparable stainless steel alloys without nitrogen. Fatigue strength, creep strength, and other mechanical properties […]
Large Melting Furnace – City Waste
The most widely applied method for the disposal of waste materials, including sludges, dusts, scales, leachable slags from smelting or melting operations, and residues from the combustion of organic materials including municipal wastes, is to inter the materials in an appropriate landfill. Small quantities of some wastes are encapsulated within Portland cement or sulfur, and […]
Precious Metal Refining
Precious Metal Refining: Dore is a mixture of gold and silver typically containing less than 5% base metal impurities. The exact composition varies widely depending on its source and processing history. Dore producers, in deciding whether or not to refine their dore, can custom design a facility around a single feedstock. Refiners, in contrast, must handle […]
Electric Arc Furnace Steelmaking using Scrap
This investigation is part of the Bureau of Mines program to develop technology that emphasizes the reuse of recycled, economically important materials, including iron and steel scrap. In addition, the research helps meet the basic objective of substituting abundant domestic materials for imported strategic commodities such as fluorspar. Scrap Preheating Of the 84.6 million st […]
Small Gold Smelting Furnace
An electronics recycler’s favorite, the RapidFire Pro-L offers the ultimate combination of portability, function, and performance demanded by professional artists, at a fraction of the cost of comparative products. The RapidFire L is the ideal solution for jewelry, metal clay, and ceramic firing and comes complete with a digital control panel, embedded heating element, 6″ […]
Remove Copper from Molten Ferrous Scrap
The importance of ferrous scrap as a resource in the domestic iron and steel industry has increased significantly during the last two decades owing to the growth of steel production in electric arc furnaces. In 1984, approximately 55 million tons of scrap was consumed in domestic steel mills, of which 56 pct was used in […]