Effect of Oxygen on the Dissolution of Gold
In discussing the effect of oxygen on the gold dissolution, one can understand the use of oxygen or an oxidizing agent is essential for the dissolution of gold under normal conditions of cyanidation. Such oxidizing agents as sodium peroxide, potassium permanganate, bromine, chlorine have been used with more or less success in the past; but […]
Effect of Gold Particle Size on Rate of Dissolution
When coarse free gold occurs in ores, the usual practice is to remove it by means of gold traps, jigs, blankets, etc. ahead of cyanidation. Otherwise, these coarse particles might not be completely dissolved in the time available for cyanidation. Another practice which reduces the size of the gold particles going to cyanidation is the […]
Gold & Silver Dissolution and Cyanide Concentration
By far the most important cyanides used in cyanidation are sodium cyanide and calcium cyanide. The latter product is sold in an impure form analyzing close to 50% NaCN equivalent. The former is sold in various grades from 85 to 98% NaCN. In comparing the dissolving effects of the cyanides of ammonium, sodium, potassium, magnesium, […]
Antique hydrometer and Humidi Guide
HYDROMETER, Baume Scale—For heavy liquids, without thermometer. Range: 0 to 70° in 1° divisions. Temperature standard, 60° F. Approximately length, 11 inches. HYDROMETER, Baume Scale—For heavy liquids, without thermometer. Range: 0 to 70° in 1° divisions. Temperature standard, 60° F. Approximately length, 16 inches. HYDROMETER, Specific Gravity Scale—For heavy liquids, without thermometer. HUMIDIGUIDE, Hampton, Taylor—A direct […]
Cyanide Leaching Chemistry & Gold Cyanidation
The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established. Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows: 4 Au + 8 NaCN + O2 + 2 H20 = 4 NaAu(CN)2 + 4 NaOH In a […]
How to Select a Rainwater Catch Basin
You need to know how much water will be draining to your catch basin in order to select the right catch basin for your project. Catch basins are an effective way to collect surface water that is draining to one specific area like a low spot in the yard or below a rain gutter downspout. […]
Laboratory Reagent Bottles
COLOR OR FLAME SCREEN, Merwin—Transparent celluloid screen in three tints of blue, which will absorb the yellow of sodium flame. Directions for distinguishing the various flame colors are furnished with each screen. BOTTLE, Packing—Green glass, narrow mouth, without stoppers. BOTTLE—Flint glass, narrow mouth, round shoulder, without stoppers. BOTTLE—Flint glass, wide mouth, round shoulder, without stoppers. BOTTLE, […]
Laboratory Air Blowers
BEAKER, Copper—With lip. With flared tcp and flat bottom. Spun from heavy copper sheet. BLOWER, Fan, Electrically Driven-—Small fan blower direct connected to high speed motor. The combination is especially designed for operating low pressure crude oil burners as used with Braun Assay Furnaces. The fan is of special construction to produce volume and pressure for atomizing the […]
Fluorine Penalties of Copper Concentrate
F Penalties often start at 300 – 500 ppm which is to say 300 ppm in Japan / Korea and perhaps ~ 500 ppm into China. Penalty scales of US $1- 2/dmt per 100 ppm. Some cases Fluorine (F): US $1.00 per dmt for each 100 ppm over 300 ppm Others F: US $2.00 per […]
Crusher Concave Profiles
When used for primary or coarse secondary crushing service, the type of crusher described is usually fitted with the style of concave shown on the upper left. These are known as “standard” or straight-face concaves, which have been the standard type of liner ever since the gyratory crusher came into popular use. The distinguishing features of […]