It was later found that 94 per cent of the gold in a 1.92-oz. Many sulfide minerals contain other components such as arsenic that are released into the environment. The solution siphoned off after this operation is delivered to a “cyanide” cement precipitation box of three compartments, steel scrap again being the precipitant. For sulfide roasting, the general reaction can be given by: Roasting the sulfide ore, until almost complete removal of the sulfur from the ore, results in a dead roast. This invention is directed to methods for roasting sulfide ores to desulfurize the same and to produce sulfur dioxide for use in the manufacture of sulfuric acid, or for any other purposes desired. In the present specification, "smalls" is used in a generic sense to define a run-of-pile ore containing some ore fine enough for suspension roasting and some .) The shell II projects upwardly beyond crown 15 and carries a steel framework 18 which in turn supports ore feeding and rabbling mechanism for the drying hearth. The most important operations are roasting, smelting, and refining. At Cochenour Willans, the FluoSolids reactor consists of a cylindrical shell built of ½-in. By the present method, smalls may be roasted In a way much more efficient than could be accomplished in a multiK hearth roaster. The flocculent nature of the charge undoubtedly contributes materially to reducing the dusting and dust losses to the low figure obtained. In the second roaster, the number was decreased to six pairs. The danger of short-circuiting was removed. Main 85 conducts such gases into a waste heat boiler 87 in which steam drum 89, -5 headers 90, and water tubes 91 may be of standard construction. per ton of cyanide as KCN. Sulfating roasting oxidizes certain sulfide ores to sulfates in a controlled supply of air to enable leaching of the sulfate for further processing. Manometers connected above and below the constriction plate and at the top of the furnace indicate the pressure drop between various parts of the reactor. A substantial operating advantage afforded by 15. the preliminary oxidation taking place in chamber 58 is that since substantial quantities of sulfur are burned in chamber 58 corresponding amcunts of heat are generated most of which heat is dissipated by radiation from the walls of the rotating shell 56. per ton approximately). Thus there is no observable local overheating at any point or points, resulting in fusion and locking-up of the gold values. A gas-fired muffle was used, which was brought up to the desired temperature before charging the roasting dishes. As distinguished from the bed or hearth roasting operation of these burners, it has been suggested to roast finely divided sulfides while in gaseous suspension. lengths of 1-in. Leave your phone number if you would like us to call you. The Dorrco FluoSolids reactor is also available in multicompartment design, the top or feed compartment serving to preheat the ore and effect preliminary decompositions, such as dehydration or the elimination of arsenic, the middle compartment being the main reaction chamber, while the lower compartment serves to cool the calcine and preheat the incoming gases. Elsewhere, the angle of repose is nearer 45 deg. To avoid loss of gold, the amount of salt added must be held at such a figure that this volatilization does not occur. There are two stages of aeration in the treatment of the calcine pulp. per ton. Calcine pulps are considerably more difficult to filter than the normal main plant pulp. Since the reaction is endothermic, the temperature of the grains cannot rise above that of the furnace and the harmful effects of “flash roasting” is avoided. The pressure set up inside the lumps causes them to burst. Often before roasting, the ore has already been partially purified, e.g. Reduction roasting partially reduces an oxide ore before the actual smelting process. The velocity of gas movement through chamber 58 and suspension roasting zone 14 are controlled by the blower, not shown, in gas main 103, and the auxiliary blower 16 ahead of the grinderburner 55. While it can be demonstrated consistently on the Lake Shore concentrates, roasting tests carried out at Lake Shore on concentrates from mines in other camps failed to show any improvement when salt was added to the charge. Sinter roasting involves heating the fine ores at high temperatures, where simultaneous oxidation and agglomeration of the ores take place. Metallurgical ContentRecover Gold by Roasting Pyrite OreRoasting of flotation concentratesRoasting Arsenopyrite Ore for GoldRoasting and leaching a sulphide concentrateRoasting and Processing Sulpho-telluride ore to recover goldFluoSolids Roasting SystemRoasting with a FluoSolids reactorWhy use Salts in the roasting processROASTING WITH SODA ASHGOLD LOSSES IN ROASTINGCalcination & Roasting … The concentrates are thickened, filtered on a drum filter provided with a flapper (see page 120), and fed by belt conveyor at 16 to 17 per cent moisture to the Edwards roaster. Experience indicates the loosely combined sulfur of the coarse ore is practically instantaneously volatilized on sudden introduction of the coarse ore into the high temperature atmosphere in chamber 58, and on account of such sudden exposure to these temperatures and consequent differential expansion, strains are set up in the coarse ore particles thus disrupting and converting the ore particles to a porous condition. The barren solution is allowed to ran to waste.

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