L D Michaud 
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, … Read more
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 … Read more
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 … Read more
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 … Read more
ABC: Assay Based Controls are changes made to regulatory setpoints that are biased on the level or changes in the level of the valuable metal being recovered. ABC Circuit: A two-stage grinding circuit composed of an autogenous mill, a ball mill and a crusher. Abrasion: Wearing away by rubbing or friction. Acicular: Having the … Read more
When the non-choking feature was being applied to existing crushers of the gyratory type, it was found that in several crushing machines, the attendant reduction in receiving opening could be partially offset by sloping the straight portion of the concaves at a wider angle than that for which the top shell was originally designed, because … Read more
The successful cyanidation of gold ores containing appreciable amounts of arsenic or antimony sulphide minerals such as orpiment, realgar, and stibnite is usually difficult or even impossible. Extractions are low and the solutions soon become ‘foul.’ The gold in such ores could be free and uncoated, and no trouble in dissolving it in clean cyanide … Read more
