How Ores have Resistance to Crushing
During the last few years, one of the great problems in the milling of all ores has been that of crushing. This subject involves not merely the cost of the operation, but also the selection of the proper degree and character of crushing to yield the best metallurgical results on the given ore. Considering the […]
Remove Arsenopyrite from Galena
This paper deals with the application of table flotation to two unusual mineral dressing problems. Both problems involved the removal of interfering minerals at sizes too coarse for normal froth flotation. The first problem was the removal of arsenical minerals from Broken Hill gravity concentrates without further size reduction. Table flotation without grinding of the […]
Gravity Spiral Concentrator Working Principle
The gravity spiral circuit is designed to extract and concentrate “coarse gold’ from the recirculating load in the mill grinding circuit and hence prevent a build-up within that circuit and the eventual escape of some of that gold into the C.I.L. tanks and thereon into the final tails. (See fig. 4) Optimum Operating Conditions of […]
Effect of Impurities on Gold Slimes Refining Process
The richer the slimes are in gold the easier it is to treat them. In the majority of cyanide plants not enough care is taken to eliminate mechanical impurities before the solutions pass into the zinc boxes. No silica or insoluble substance should be allowed to pass into the precipitating box. Further, some salts are […]
Liebherr Hydraulic Excavator Parts
Purify Gold Slimes to Make Bullion Gold Bar by Nitre
When carrying out experiments on the best methods of cleaning up or obtaining bars of bullion from gold slimes several points have to be considered. Large losses sometimes occur in ordinary practice in the drying and roasting of such finely divided material; losses occur through the feeding of such fine dust into the melting pots, […]
MP Cone Crusher Parts
Gold Slimes Refining & Acid Treatment of Precipitates
Strong Nitric Acid Many attempts were made to further purify bullion slimes before smelting. The impurities present, as well as the gold, are in a state of fine division, and, therefore, adapted for solution. It might be assumed that copper and silver present could be removed by means of nitric acid. This acid was tried […]
Treatment of Cyanide Precipitate AKA Gold Pregnant Solutions
Comparatively little trouble was experienced in gold milling with regard to the preparation of a pure bullion until the advent of the cyanide process. When ores were smelted the litharge method of elimination of baser metals and the subsequent parting had been worked out in fine detail. When alluvial gold was collected and smelted the […]
Electrolytic Refining of Gold
The method just described aims at leaving gold in an insoluble state at the anode. Other impurities are usually left there, and the gold sponge, or slimes, needs further refining by methods, to be indicated later. By using a suitable electrolyte the gold can be dissolved from the anode bars and deposited in sheet form […]