Gold-selenium ore processing

Gold selenium ore usually contains selenium 0.05-0.2%, because selenium is dissolved in cyanide solution, which complicates the cyanidation process (increased cyanide consumption and selenium film on the surface of zinc , making gold difficult to be replaced by zinc) . Therefore, the gold-selenium ore is processed by the following method before extracting gold:
1. For ores containing less than 0.05% selenium, a low concentration cyanide solution should be used for cyanidation to reduce the solubility of selenium. At the same time, when replacing gold with zinc powder, the solution must be increased, preferably by cyanidation with activated carbon. Gold is adsorbed in the solution, and the concentrate can be calcined at 600 to 700 ° C, and the calcination is carried out by cyanidation.
2. For ores containing more than 0.05% selenium, it is best to use a bleaching powder solution to leach selenium from the ore and then recover the gold by cyanidation. Selenium leaching can be carried out by diafiltration and stirring. The percolation bleaching powder consumption is several tens of kilograms per ton of ore, and the recovery rate of selenium is 90%; the consumption of stirring bleaching powder is less, but the recovery rate of selenium can reach 98 to 100%. Available exudate debris precipitated selenium dioxide and iron from the solution.

Monel Flange

MONEL®

The registered trademark name, Monel, is applied as the prefix name to several corrosion resistant alloys produced by Special Metals Corporation. These alloys are nickel-based and exhibit traits that include high resistance to atmospheric corrosion, salt water, and various acid and alkaline solutions.

Alloys of identical chemical and mechanical properties are available from other manufacturers and offer excellent alternatives to the various Monel® brand alloys.

The corrosion-resistant alloy is widely used in the marine, oil and chemical processing industries.


Monel Availability

Mega Mex supplies Monel 400, K-500 & R-405. Most of these grades are available in the form of plate, sheet, pipe, tubing, fittings, bar, wire and rod.


What are the Characteristics of Monel ?

Good resistance to acids such as hydrofluoric and sulfuric acid
Highly resistant to alkalis
Malleable
Highly corrosion resistant
Stronger than steel

In what Applications are Monel alloys used ?

Pump shafts, oil-well tools, instruments, doctor blades and scrapers, springs, valve trim, fasteners, marine propeller shafts
Marine components
Chemical and hydrocarbon processing equipment
Valves, pumps, shafts, fittings, heat exchangers

Monel Trivia

Monel was discovered by Robert Crooks Stanley who worked for the International Nickel Company in 1901. The new alloy was named in honor of the president of the company, Ambrose Monell.

*Monel® is a registered trademark of Special Metals Corporation group of Companies.

Monel Flange,Monel 400 Flange,Monel Steel Flange

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